STOP AND START SYSTEM Backup Boost Converter Circuit

DESCRIPTION

A backup boost converter is built into the engine stop and start ECU.

The backup boost converter and eco run vehicle converter assembly (external backup boost converter) help maintain the power source voltage when the engine is restarted by stop and start control.

This prevents various functions such as the audio and visual system from malfunctioning if the power source voltage drops due to the battery voltage dropping when the engine is restarted by stop and start control.

If any DTCs are output, troubleshoot the DTCs first.

Tech Tips

A relay function and fuse function are provided in the backup boost converter and eco run vehicle converter assembly (external backup boost converter).

If there is a malfunction in any of the electrical system circuits connected to the backup boost converter and eco run vehicle converter assembly (external backup boost converter), the fuse and relay functions shut off the malfunctioning circuit to protect other circuits (remains shut off until next trip).

When the electrical system circuit is shut off, power to the circuit is cut off, causing any systems connected to the circuit to be disabled.

The fuse function is reset*1 when the engine switch is turned off. If the malfunction still exists in the electrical system circuit that has been shut off by the relay function, it will be shut off again by the relay and fuse functions the next time the engine switch is turned on (IG).

*1: A semiconductor fuse self resets according to electric signal.

The backup boost converter supplies power to:


  • Vehicle stability control system

  • Power steering system

  • Dynamic radar cruise control system

  • Inner rear view mirror assembly (w/ EC Mirror)

  • Lane departure alert system

  • Air conditioning system

  • CAN communication system (Network gateway ECU)

  • Panoramic view monitor system

  • Blind spot monitor system

  • Meter / Gauge system (Headup display)

  • Remote operation controller assembly

  • Telematics System

  • Electric parking brake system

  • Tire pressure warning system

  • Entry and start system (w/ Entry and Start System)

  • Push-button start (w/o Entry and Start System)

The eco run vehicle converter assembly (external backup boost converter) supplies power to:


  • Audio and visual system

WIRING DIAGRAM

A01XO7FE01
A01XPBRE02
A01XPADE01
A01XO3LE01

CAUTION / NOTICE / HINT

Note


  • for 8AR-FTS:

    Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here

  • for 3ZR-FAE:

    When replacing the engine stop and start ECU with a new one, make sure to download the previous status (number of starter operations) of the old engine stop and start ECU. After replacing the engine stop and start ECU, turn the engine switch on (IG) and wait 20 seconds, then confirm that "OK" is displayed for the Data List item "Oper Prohibition (O/P Air Bleeding)". Then upload the previous status (number of starter operations) to the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or airbag ECU assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK PROBLEM SYMPTOMS


    1. Determine the trouble area by referring to the table below.

      Effect on Vehicle Trouble Area/Cause Fail-safe DTC Output Stop and start cancel indicator light Symptom Proceed to

      When the engine is restarted by stop and start control:

      The following symptoms may occur,


      • Audio and visual system is reset

      • The combination meter assembly fades out

      • The steering wheel feels heavy when the engine is restarted*

        *A DTC may be stored in the power steering system

      Backup boost converter internal malfunction


      • Internal power source malfunction

      • Internal power source overvoltage

      • CPU duty malfunction

      • Communication cycle error

      		 Stop and start control prohibited P323B Blinks Systems stop operating during engine restart as the backup boost converter output voltage cannot be boosted A
      Battery voltage drop

      Systems on the converter output side do not operate

      BO1 terminal: All of the following will not operate,


      • Remote operation controller assembly (w/ Navigation system)

      • Panoramic view monitor system

      • Telematics System

      BO2 terminal: All of the following will not operate,


      • Electric parking brake system

      • Tire pressure warning system (Tire Pressure Warning ECU and Receiver (for RH Side))

      IGO1 terminal: All of the following will not operate,


      • Vehicle stability control system

      • Power steering system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Panoramic view monitor system

      • Inner rear view mirror assembly (w/ EC Mirror)

      • Blind spot monitor system

      • Meter/gauge system (Headup display)

      • Telematics System

      • Tire pressure warning system

      • Entry and start system (w/ Entry and Start System)

      • Push-button start (w/o Entry and Start System)

      • CAN communication system (Network gateway ECU)

      		 Overcurrent applied to an output terminal (output terminal relay circuit is shutoff)

      Stop and start control is prohibited

      (Connected ECUs or sensors may detect power source malfunction DTCs)

      		 B22C0 Blinks Systems do not operate as power supply from the converter is cut off A

      Systems do not operate

      (Due to converter input side malfunction)

      IG1 terminal: All of the following will not operate,


      • Vehicle stability control system

      • Power steering system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Panoramic view monitor system

      • Inner rear view mirror assembly (w/ EC Mirror)

      • Blind spot monitor system

      • Meter/gauge system (Headup display)

      • Telematics System

      • Tire pressure warning system

      • Entry and start system

      • CAN communication system (Network gateway ECU)

      IG2 terminal: The combination meter assembly will not function

      ACC terminal: All of the following will not operate,


      • Air conditioning system

      • Panoramic view monitor system

      • Telematics System

      • Remote operation controller assembly

      Converter input circuit malfunction


      • Open or short to GND in IG1 circuit

      • Open or short to GND in IG2 circuit

      • Open or short to GND in ACC circuit

      		 Stop and start control prohibited - Does not blink (Blinks when communication error DTCs are stored) Systems do not operate as power supply from the converter is cut off B

      Systems on the converter output side do not operate

      (varies depending on the malfunctioning relay circuit the converter detected)

      ACO terminal:


      • The remote operation controller assembly will not operate.

      • The panoramic view monitor system will not operate.

      • The air conditioning system will not operate.

      IGO2 terminal: The combination meter assembly will not operate

      Malfunction in circuits the converter supplies power to

      (between the converter and ECUs or sensors)


      • Open or short in the combination meter assembly circuit

      		 Related systems do not operate as the relay circuit in the converter is turned off - Does not blink (Blinks when communication error DTCs are stored) Systems do not operate as power supply from the converter is cut off B

      All of the following systems do not operate


      • Vehicle stability control system

      • Power steering system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Panoramic view monitor system

      • Inner rear view mirror assembly (w/ EC Mirror)

      • Blind spot monitor system

      • Meter/gauge system

      • Telematics System

      • Tire pressure warning system

      • Entry and start system (w/ Entry and Start System)

      • Push-button start (w/o Entry and Start System)

      • CAN communication system (Network gateway ECU)

      • Open in BBC fuse circuit

      • Short in converter circuit

      • Backup boost converter malfunction

      		 Stop and start control prohibited P0617 Does not blink (Due to disabled meter/gauge system) All systems that the converter supplies power to do not operate (see circuit diagram) A
      P323B

      The audio does not operate

      (until the engine switch is turned off)

      Excessive audio volume

      Data List item "State of External BBC" displays "Overload" while the circuit is protected

      		 The relay circuit in the converter is turned off to cut off power supply to the navigation system (audio system) (Returns to normal when the engine switch is turned off) - Does not blink

      If overcurrent is detected in the navigation system, system operation is disabled while the engine switch is on (IG)

      (Returns to normal when the engine switch is turned off)

      		 C

      The combination meter assembly cannot be turned off (short between IGO2 and +B)

      Communication error DTCs may be stored due to short between IGO1 and +B

      Tech Tips

      Varies depending on the number of times an open occurs in the +B circuit

      Converter circuit malfunction


      • Short between IGO2 and +B

      		 - - Does not blink The converter cannot shut off the power source when the engine switch is turned off B

      Engine switch does not turn on (ACC) (short between ACC and +B)

      Engine switch does not turn off (short between IG1 or IG2 and +B)

      Engine stop and start ECU power source circuit malfunction


      • Short between ACC and +B

      • Short between IG1 and +B

      • Short between IG2 and +B

      		 - - Does not blink

      • Engine switch does not turn on (ACC)

      • Engine switch does not turn off

      		 B
      The audio and visual system cannot be turned off (short between ACC and BIN)

      Eco run vehicle converter assembly (external backup boost converter) circuit malfunction


      • Short between ACC and BIN

      		 - - Does not blink The eco run vehicle converter assembly (external backup boost converter) cannot shut off the power source when the engine switch is turned off D
      Result
      Proceed to
      A
      B
      C
      D

    A

    GO TO DTC CHART Click here

    C

    CHECK AUDIO AND VISUAL SYSTEM Click here

    D

    CHECK HARNESS AND CONNECTOR (ECO RUN VEHICLE CONVERTER ASSEMBLY (EXTERNAL BACKUP BOOST CONVERTER) POWER SOURCE CIRCUIT) Click here

    B

  2. CHECK ENGINE STOP AND START ECU (POWER SOURCE CIRCUIT)


    1. B0057PHC30
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the engine stop and start ECU connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A37-7 (BIN) - Body ground Always 9.5 to 14 V

    3. Turn the engine switch on (ACC).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I57-19 (ACC) - Body ground Engine switch on (ACC) 9.5 to 14 V

    5. Turn the engine switch on (IG).

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I57-17 (IG1) - Body ground Engine switch on (IG) 9.5 to 14 V
      I57-20 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V

    7. Turn the engine switch off.

    8. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I57-17 (IG1) - Body ground Engine switch off 0 to 1 V
      I57-19 (ACC) - Body ground Engine switch off 0 to 1 V
      I57-20 (IG2) - Body ground Engine switch off 0 to 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)


    1. Disconnect the connector from the corresponding system ECU/sensor.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Skid Control ECU (Brake Actuator Assembly)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - A36-12 (IG1) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      A36-12 (IG1) - Body ground Always 10 kΩ or higher
      Power Steering ECU Assembly (w/ Power Tilt and Power Telescopic)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - n2-1 (IG) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      n2-1 (IG) - Body ground Always 10 kΩ or higher
      Power Steering ECU Assembly (w/o Power Tilt and Power Telescopic)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - n3-1 (IG) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      n3-1 (IG) - Body ground Always 10 kΩ or higher
      Driving support ECU assembly (w/ Dynamic Radar Cruise Control System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - I19-30 (B) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I19-30 (B) - Body ground Always 10 kΩ or higher
      Spiral with Sensor Cable Sub-assembly
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - I6-4 (IG1) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I6-4 (IG1) - Body ground Always 10 kΩ or higher
      Inner Rear View Mirror Assembly (w/ EC Mirror)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - T5-1 (IG) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      T5-1 (IG) - Body ground Always 10 kΩ or higher
      Lane Departure Warning Camera (w/ Lane Departure Alert System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - T10-7 (IGB) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      T10-7 (IGB) - Body ground Always 10 kΩ or higher
      Millimeter Wave Radar Sensor Assembly (w/ Dynamic Radar Cruise Control System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - A21-5 (IGB) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      A21-5 (IGB) - Body ground Always 10 kΩ or higher
      Air Conditioning Control Assembly
      Tester Connection Condition Specified Condition
      I57-3 (ACO) - I13-5 (ACC) Always Below 1 Ω
      I57-12 (IGO1) - I13-8 (IG+) Always Below 1 Ω
      I57-3 (ACO) - Body ground Always 10 kΩ or higher
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I13-5 (ACC) - Body ground Always 10 kΩ or higher
      I13-8 (IG+) - Body ground Always 10 kΩ or higher
      Network Gateway ECU
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - I67-10 (IG1) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I67-10 (IG1) - Body ground Always 10 kΩ or higher
      Tire Pressure Warning ECU and Receiver (Tire Pressure Warning ECU and Receiver (for LH Side))
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - Q46-1 (IG) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      Q46-1 (IG) - Body ground Always 10 kΩ or higher
      Tire Pressure Warning ECU and Receiver (Door Control and Tire Pressure Monitoring System Receiver Assembly) (Tire Pressure Warning ECU and Receiver (for RH Side))
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - P11-1 (IG) Always Below 1 Ω
      I57-9 (BO2) - P11-7 (+B) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      P11-1 (IG) - Body ground Always 10 kΩ or higher
      I57-9 (BO2) - Body ground Always 10 kΩ or higher
      P11-7 (+B) - Body ground Always 10 kΩ or higher
      Parking assist ECU (w/ Panoramic View Monitor System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - P19-6 (IG) Always Below 1 Ω
      I57-2 (BO1) - P19-2 (+B) Always Below 1 Ω
      I57-3 (ACO) - P19-1 (ACC) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      P19-6 (IG) - Body ground Always 10 kΩ or higher
      I57-2 (BO1) - Body ground Always 10 kΩ or higher
      P19-2 (+B) - Body ground Always 10 kΩ or higher
      I57-3 (ACO) - Body ground Always 10 kΩ or higher
      P19-1 (ACC) - Body ground Always 10 kΩ or higher
      Parking Brake ECU Assembly
      Tester Connection Condition Specified Condition
      I57-9 (BO2) - Q24-3 (BECU) Always Below 1 Ω
      I57-9 (BO2) - Body ground Always 10 kΩ or higher
      Q24-3 (BECU) - Body ground Always 10 kΩ or higher
      Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - V1-5 (BLB) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      V1-5 (BLB) - Body ground Always 10 kΩ or higher
      Blind Spot Monitor Sensor RH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - X1-5 (BRB) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      X1-5 (BRB) - Body ground Always 10 kΩ or higher
      Telematics Transceiver (w/ Telematics Transceiver)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - I40-7 (IG2) Always Below 1 Ω
      I57-2 (BO1) - I40-1 (+B) Always Below 1 Ω
      I57-3 (ACO) - I40-8 (ACC) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      I40-7 (IG2) - Body ground Always 10 kΩ or higher
      I57-2 (BO1) - Body ground Always 10 kΩ or higher
      I40-1 (+B) - Body ground Always 10 kΩ or higher
      I57-3 (ACO) - Body ground Always 10 kΩ or higher
      I40-8 (ACC) - Body ground Always 10 kΩ or higher
      Combination Meter Mirror ECU (w/ Headup Display)
      Tester Connection Condition Specified Condition
      I57-12 (IGO1) - J5-1 (IG) Always Below 1 Ω
      I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      J5-1 (IG) - Body ground Always 10 kΩ or higher
      Remote Operation Controller Assembly (w/ Navigation System)
      Tester Connection Condition Specified Condition
      I57-2 (BO1) - I71-1 (+B) Always Below 1 Ω
      I57-3 (ACO) - I71-6 (ACC) Always Below 1 Ω
      I71-1 (+B) - Body ground Always 10 kΩ or higher
      I57-2 (BO1) - Body ground Always 10 kΩ or higher
      I71-6 (ACC) - Body ground Always 10 kΩ or higher
      I57-3 (ACO) - Body ground Always 10 kΩ or higher
      Remote Operation Controller Assembly (w/o Navigation System)
      Tester Connection Condition Specified Condition
      I57-3 (ACO) - I132-14 (ACC) Always Below 1 Ω
      I132-14 (ACC) - Body ground Always 10 kΩ or higher
      I57-3 (ACO) - Body ground Always 10 kΩ or higher
      Combination Meter Assembly
      Tester Connection Condition Specified Condition
      I57-11 (IGO2) - I10-21 (IG+) Always Below 1 Ω
      I57-11 (IGO2) - Body ground Always 10 kΩ or higher
      I10-21 (IG+) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

      Tech Tips

      The installation location of the tire pressure warning ECU and receiver differs depending on the specification. Refer to the following link for the installation location information.

      Click here


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ENGINE STOP AND START ECU (EACH ECU OR SENSOR POWER SOURCE CIRCUIT)


    1. Disconnect the connector from the corresponding system ECU/sensor.

      A01XP26C02
      *A w/ Dynamic Radar Cruise Control System *B w/ Lane Departure Alert System
      *C w/ Panoramic View Monitor System *D w/ Blind Spot Monitor System
      *E w/ EC Mirror *F Tire Pressure Warning ECU and Receiver (for LH Side)
      *G Tire Pressure Warning ECU and Receiver (for RH Side) *H w/ Navigation System
      *I w/o Navigation System *J w/ Power Tilt and Power Telescopic
      *K w/o Power Tilt and Power Telescopic *L w/ Telematics Transceiver
      *M w/ Headup Display - -
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      		 *b

      Front view of wire harness connector

      (to Power Steering ECU Assembly)
      *c

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly)

      		 *d

      Front view of wire harness connector

      (to Inner Rear View Mirror Assembly)
      *e

      Front view of wire harness connector

      (to Remote Operation Controller Assembly)

      		 *f

      Front view of wire harness connector

      (to Driving Support ECU Assembly)
      *g

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)

      		 *h

      Front view of wire harness connector

      (to Lane Departure Warning Camera)
      *i

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      		 *j

      Front view of wire harness connector

      (to Network Gateway ECU)
      *k

      Front view of wire harness connector

      (to Parking Assist ECU)

      		 *l

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor RH)
      *m

      Front view of wire harness connector

      (to Blind Spot Monitor Sensor LH)

      		 *n

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)
      *o

      Front view of wire harness connector

      (to Combination Meter Mirror ECU)

      		 *p

      Front view of wire harness connector

      (to Telematics Transceiver)
      *q

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

      		 *r

      Front view of wire harness connector

      (to Combination Meter Assembly)
      *s

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      		 *t

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver (Door Control and Tire Pressure Monitoring System Receiver Assembly))
      *u

      Front view of wire harness connector

      (to Remote Operation Controller Assembly)

      		 - -

    2. Measure the voltage according to the value(s) in the table below.

      Tech Tips

      Measure the voltage at the corresponding terminals.

      Standard Voltage
      Tester Connection Condition Specified Condition
      P19-2 (+B) - Body ground*1 Always 10.5 to 16 V
      I40-1 (+B) - Body ground*4 Always 10.5 to 16 V
      I71-1 (+B) - Body ground*2 Always 10.5 to 16 V
      P11-7 (+B) - Body ground*3 Always 10.5 to 16 V
      Q24-3 (BECU) - Body ground Always 10.5 to 16 V

      • *1: w/ Panoramic View Monitor System

      • *2: w/ Navigation System

      • *3: Tire Pressure Warning ECU and Receiver (for RH Side)

      • *4: w/ Telematics Transceiver

    3. Turn the engine switch on (ACC).

    4. Measure the voltage according to the value(s) in the table below.

      Tech Tips

      Measure the voltage at the corresponding terminals.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I13-5 (ACC) - Body ground Engine switch on (ACC) 10.5 to 16 V
      P19-1 (ACC) - Body ground*1 Engine switch on (ACC) 10.5 to 16 V
      I40-8 (ACC) - Body ground*4 Engine switch on (ACC) 10.5 to 16 V
      I71-6 (ACC) - Body ground*2 Engine switch on (ACC) 10.5 to 16 V
      I132-14 (ACC) - Body ground*3 Engine switch on (ACC) 10.5 to 16 V

      • *1: w/ Panoramic View Monitor System

      • *2: w/ Navigation System

      • *3: w/o Navigation System

      • *4: w/ Telematics Transceiver

    5. Turn the engine switch on (IG).

    6. Measure the voltage according to the value(s) in the table below.

      Tech Tips

      Measure the voltage at the corresponding terminals.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A36-12 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      n2-1 (IG) - Body ground*8 Engine switch on (IG) 10.5 to 16 V
      n3-1 (IG) - Body ground*9 Engine switch on (IG) 10.5 to 16 V
      I19-30 (B) - Body ground *1 Engine switch on (IG) 10.5 to 16 V
      I6-4 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      T5-1 (IG) - Body ground*2 Engine switch on (IG) 10.5 to 16 V
      T10-7 (IGB) - Body ground*3 Engine switch on (IG) 10.5 to 16 V
      A21-5 (IGB) - Body ground*1 Engine switch on (IG) 10.5 to 16 V
      I13-8 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V
      I67-10 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      Q46-1 (IG) - Body ground*4 Engine switch on (IG) 10.5 to 16 V
      P19-6 (IG) - Body ground*5 Engine switch on (IG) 10.5 to 16 V
      P11-1 (IG) - Body ground*6 Engine switch on (IG) 10.5 to 16 V
      X1-5 (BRB) - Body ground*7 Engine switch on (IG) 10.5 to 16 V
      V1-5 (BLB) - Body ground*7 Engine switch on (IG) 10.5 to 16 V
      I40-7 (IG2) - Body ground*10 Engine switch on (IG) 10.5 to 16 V
      J5-1 (IG) - Body ground*11 Engine switch on (IG) 10.5 to 16 V
      I10-21 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V

      • *1: w/ Dynamic Radar Cruise Control System

      • *2: w/ EC Mirror

      • *3: w/ Lane Departure Alert System

      • *4: Tire Pressure Warning ECU and Receiver (for LH Side)

      • *5: w/ Panoramic View Monitor System

      • *6: Tire Pressure Warning ECU and Receiver (for RH Side)

      • *7: w/ Blind Spot Monitor System

      • *8: w/ Power Tilt and Power Telescopic

      • *9: w/o Power Tilt and Power Telescopic

      • *10: w/ Telematics Transceiver

      • *11: w/ Headup Display

      Result
      Proceed to
      OK
      NG

      Tech Tips

      The installation location of the tire pressure warning ECU and receiver differs depending on the specification. Refer to the following link for the installation location information.

      Click here


    OK

    CHECK POWER SOURCE CIRCUIT (POWER SOURCE CIRCUIT OF RELATED SYSTEM)

    NG

    REPLACE ENGINE STOP AND START ECU Click here

  5. CHECK AUDIO AND VISUAL SYSTEM


    1. Turn the engine switch off and wait for 1 minute.

    2. Turn the engine switch on.

    3. Lower the audio volume.

    4. Check if the audio and visual system operates normally.

      OK
      Audio and visual system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

  6. CHECK HARNESS AND CONNECTOR (ECO RUN VEHICLE CONVERTER ASSEMBLY (EXTERNAL BACKUP BOOST CONVERTER) ACO, BO1, BO2 TERMINAL CIRCUIT)


    1. w/ Navigation System:

      Disconnect the I38 radio receiver assembly connector.

      w/o Navigation System:

      Disconnect the I120 radio receiver assembly connector.

    2. Disconnect the I42 multi-display assembly connector.

    3. Disconnect the A8 eco run vehicle converter assembly (external backup boost converter) connector.

    4. w/ Navigation System:

      Disconnect the P22 stereo component amplifier assembly connector.

      w/o Navigation System and Separate Type Amplifier:

      Disconnect the P32 and P33 stereo component amplifier assembly connectors.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A8-4 (BO2) - Body ground Always 10 kΩ or higher
      A8-5 (BO1) - Body ground Always 10 kΩ or higher
      A8-12 (ACO) - Body ground Always 10 kΩ or higher
      I38-17 (+B1) - Body ground*1 Always 10 kΩ or higher
      I38-16 (ACC1) - Body ground*1 Always 10 kΩ or higher
      I120-4 (+B1) - Body ground*2 Always 10 kΩ or higher
      I120-3 (ACC1) - Body ground*2 Always 10 kΩ or higher
      I42-12 (B) - Body ground Always 10 kΩ or higher
      I42-24 (ACC) - Body ground Always 10 kΩ or higher
      P22-1 (+B) - Body ground*1 Always 10 kΩ or higher
      P22-16 (+B2) - Body ground*1 Always 10 kΩ or higher
      P32-1 (+B) - Body ground*3 Always 10 kΩ or higher
      P32-16 (+B2) - Body ground*3 Always 10 kΩ or higher
      P33-12 (ACC) - Body ground*3 Always 10 kΩ or higher

      • *1: w/ Navigation System

      • *2: w/o Navigation System

      • *3: w/o Navigation System and Separate Type Amplifier

      Result
      Proceed to
      OK
      NG

    OK

    GO TO AUDIO AND VISUAL SYSTEM for 8 Speakers: Click here except 8 Speakers: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (ECO RUN VEHICLE CONVERTER ASSEMBLY (EXTERNAL BACKUP BOOST CONVERTER) POWER SOURCE CIRCUIT)


    1. Disconnect the A8 eco run vehicle converter assembly (external backup boost converter) connector.

    2. A01XOPVC02
      *a

      Front view of wire harness connector

      (to Eco Run Vehicle Converter Assembly (External Backup Boost Converter))

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A8-11 (BIN) - Body ground Always 9.5 to 14 V

    3. Turn the engine switch on (ACC).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A8-3 (ACC) - Body ground Engine switch on (ACC) 9.5 to 14 V

    5. Turn the engine switch off.

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A8-3 (ACC) - Body ground Engine switch off 0 to 1 V

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A8-6 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ECO RUN VEHICLE CONVERTER ASSEMBLY (EXTERNAL BACKUP BOOST CONVERTER) ACO, BO1, BO2 TERMINAL CIRCUIT)


    1. w/ Navigation System:

      Disconnect the I38 radio receiver assembly connector.

      w/o Navigation System:

      Disconnect the I120 radio receiver assembly connector.

    2. Disconnect the I42 multi-display assembly connector.

    3. w/ Navigation System:

      Disconnect the P22 stereo component amplifier assembly connector.

      w/o Navigation System and Separate Type Amplifier:

      Disconnect the P32 and P33 stereo component amplifier assembly connectors.

    4. Disconnect the A8 eco run vehicle converter assembly (external backup boost converter) connector.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Radio Receiver Assembly (w/ Navigation System)
      Tester Connection Condition Specified Condition
      A8-4 (BO2) - I38-17 (+B1) Always Below 1 Ω
      A8-12 (ACO) - I38-16 (ACC1) Always Below 1 Ω
      A8-4 (BO2) - Body ground Always 10 kΩ or higher
      I38-17 (+B1) - Body ground Always 10 kΩ or higher
      A8-12 (ACO) - Body ground Always 10 kΩ or higher
      I38-16 (ACC1) - Body ground Always 10 kΩ or higher
      Radio Receiver Assembly (w/o Navigation System)
      Tester Connection Condition Specified Condition
      A8-4 (BO2) - I120-4 (+B1) Always Below 1 Ω
      A8-12 (ACO) - I120-3 (ACC1) Always Below 1 Ω
      A8-4 (BO2) - Body ground Always 10 kΩ or higher
      I120-4 (+B1) - Body ground Always 10 kΩ or higher
      A8-12 (ACO) - Body ground Always 10 kΩ or higher
      I120-3 (ACC1) - Body ground Always 10 kΩ or higher
      Multi-display Assembly
      Tester Connection Condition Specified Condition
      A8-4 (BO2) - I42-12 (B) Always Below 1 Ω
      A8-12 (ACO) - I42-24 (ACC) Always Below 1 Ω
      A8-4 (BO2) - Body ground Always 10 kΩ or higher
      I42-12 (B) - Body ground Always 10 kΩ or higher
      A8-12 (ACO) - Body ground Always 10 kΩ or higher
      I42-24 (ACC) - Body ground Always 10 kΩ or higher
      Stereo Component Amplifier Assembly (w/ Navigation System)
      Tester Connection Condition Specified Condition
      A8-5 (BO1) - P22-1 (+B) Always Below 1 Ω
      A8-5 (BO1) - P22-16 (+B2) Always Below 1 Ω
      A8-5 (BO1) - Body ground Always 10 kΩ or higher
      P22-1 (+B) - Body ground Always 10 kΩ or higher
      P22-16 (+B2) - Body ground Always 10 kΩ or higher
      Stereo Component Amplifier Assembly (w/o Navigation System and Separate Type Amplifier)
      Tester Connection Condition Specified Condition
      A8-5 (BO1) - P32-1 (+B) Always Below 1 Ω
      A8-5 (BO1) - P32-16 (+B2) Always Below 1 Ω
      A8-12 (ACO) - P33-12 (ACC) Always Below 1 Ω
      A8-5 (BO1) - Body ground Always 10 kΩ or higher
      P32-1 (+B) - Body ground Always 10 kΩ or higher
      P32-16 (+B2) - Body ground Always 10 kΩ or higher
      P33-12 (ACC) - Body ground Always 10 kΩ or higher
      A8-12 (ACO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (NAVIGATION SYSTEM POWER SOURCE CIRCUIT)

    A01XP90C01
    *A w/ Navigation System *B w/o Navigation System
    *C w/o Navigation System and Separate Type Amplifier - -
    *a

    Front view of wire harness connector

    (to Radio Receiver Assembly)

    		 *b

    Front view of wire harness connector

    (to Stereo Component Amplifier Assembly)
    *c

    Front view of wire harness connector

    (to Radio Receiver Assembly)

    		 *d

    Front view of wire harness connector

    (to Multi-display Assembly)
    *e

    Front view of wire harness connector

    (to Stereo Component Amplifier Assembly)

    		 - -

    1. w/ Navigation System:

      Disconnect the I38 radio receiver assembly connector.

      w/o Navigation System:

      Disconnect the I120 radio receiver assembly connector.

    2. Disconnect the I42 multi-display assembly connector.

    3. w/ Navigation System:

      Disconnect the P22 stereo component amplifier assembly connector.

      w/o Navigation System and Separate Type Amplifier:

      Disconnect the P32 and P33 stereo component amplifier assembly connectors.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I38-17 (+B1) - Body ground*1 Always 10.5 to 16 V
      I120-4 (+B1) - Body ground*2 Always 10.5 to 16 V
      I42-12 (B) - Body ground Always 10.5 to 16 V
      P22-1 (+B) - Body ground*1 Always 10.5 to 16 V
      P22-16 (+B2) - Body ground*1 Always 10.5 to 16 V
      P32-1 (+B) - Body ground*3 Always 10.5 to 16 V
      P32-16 (+B2) - Body ground*3 Always 10.5 to 16 V

      • *1: w/ Navigation System

      • *2: w/o Navigation System

      • *3: w/o Navigation System and Separate Type Amplifier

    5. Turn the engine switch on (ACC).

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I38-16 (ACC1) - Body ground*1 Engine switch on (ACC) 10.5 to 16 V
      I120-3 (ACC1) - Body ground*2 Engine switch on (ACC) 10.5 to 16 V
      I42-24 (ACC) - Body ground Engine switch on (ACC) 10.5 to 16 V
      P33-12 (ACC) - Body ground*3 Engine switch on (ACC) 10.5 to 16 V

      • *1: w/ Navigation System

      • *2: w/o Navigation System

      • *3: w/o Navigation System and Separate Type Amplifier

      Result
      Proceed to
      OK
      NG

    OK

    GO TO AUDIO AND VISUAL SYSTEM for 8 Speakers: Click here except 8 Speakers: Click here

    NG

    REPLACE ECO RUN VEHICLE CONVERTER ASSEMBLY Click here