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 helps 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.

If there is a malfunction in any of the electrical system circuits connected to the 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* 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).

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


    The backup boost converter supplies power to:

  • Tire pressure warning system

  • Lighting system

  • G-book system (w/ Telematics Transceiver)

  • Navigation system

  • Audio and visual system

  • Blind spot monitor system

  • Auto glare-resistant EC mirror

  • Dynamic radar cruise control system

  • Pre-crash safety system

  • CAN communication system

  • Lane departure alert system

  • Air conditioning system

  • Vehicle stability control system

  • Auto glare-resistant EC mirror

  • Meter / gauge system


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

  • Navigation system

  • Audio and visual system

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and total number of engine starts and write it into a new 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 yaw rate sensor, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • When the engine stop and start ECU is replaced, check the oil pump assembly with solenoid.

    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


        B41 terminal: All of the following will not operate

      • Tire pressure warning system

      • Lighting system


        B42 terminal: All of the following will not operate

      • G-book system (w/ Telematics Transceiver)

      • Navigation system

      • Audio and visual system


        B43 terminal: All of the following will not operate

      • Navigation system

      • Audio and visual system


        IG41 terminal: All of the following will not operate

      • Tire pressure warning system

      • Blind spot monitor system

      • Auto glare-resistant EC mirror

      • Pre-crash safety system

      • CAN communication system

      • Lane departure alert system

      • Air conditioning system

      		 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

      • Power steering system

      • Vehicle stability control system

      • Tire pressure warning system

      • Blind spot monitor system

      • Auto glare-resistant EC mirror

      • Dynamic radar cruise control system

      • Pre-crash safety system

      • CAN communication system

      • Lane departure alert system

      • Air conditioning system


        IG2 terminal: All of the following will not operate

      • Meter / gauge system

      • G-book system (w/ Telematics Transceiver)


        ACC terminal: All of the following will not operate

      • Audio and visual system

      • Navigation system

      • G-book system (w/ Telematics Transceiver)

      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)


        AC41 terminal:

      • The air G-book system (w/ telematics transceiver) will not operate.

      • The navigation system will not operate.

      • The audio and visual system will not operate.


        AC42 terminal:

      • The air G-book system (w/ telematics transceiver) will not operate.

      • The navigation system will not operate.


        IG11 terminal:

      • The power steering system will not operate


        IG12 terminal:

      • The meter / gauge system will not operate


        IG13 terminal:

      • The air G-book system (w/ telematics transceiver) will not operate.


        IG31 terminal:

      • The vehicle stability control system will not operate


        B12 terminal:

      • The air G-book system (w/ telematics transceiver) will not operate.


        IL41 terminal:

      • The air conditioning system will not operate


        IL41 terminal:

      • The navigation system will not operate.

      • The air conditioning system will not operate

      • The audio and visual system 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:

      • Tire pressure warning system

      • Lighting system

      • G-book system (w/ Telematics Transceiver)

      • Navigation system

      • Audio and visual system

      • Blind spot monitor system

      • Auto glare-resistant EC mirror

      • Dynamic radar cruise control system

      • Pre-crash safety system

      • CAN communication system

      • Lane departure alert system

      • Air conditioning system

      • Vehicle stability control system

      • Auto glare-resistant EC mirror

      • Meter / gauge system

      • Open in BBC NO. 1 fuse circuit

      • Open in BBC NO. 2 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 BBC" displays "BBC Overcurrent" while the circuit is protected

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

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

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

      		 C

      • The G-book system (w/ telematics transceiver), navigation system, audio and visual system cannot be turned off (short between AC41 and +B)

      • The G-book system (w/ telematics transceiver) and navigation system cannot be turned off (short between AC42 and +B)

      • The meter / gauge system cannot be turned off (short between IG12 and +B)

      • Communication error DTCs may be stored due to short between IG31 and +B

      Tech Tips

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

      Converter circuit malfunction


      • Short between AC41 and +B

      • Short between AC42 and +B

      • Short between IG12 and +B

      • Short between IG31 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
      Result
      Proceed to
      A
      B
      C

    A

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    C

    CHECK AUDIO AND VISUAL SYSTEM Click here

    B

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


    1. B003X1AC13
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the engine stop and start ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A93-1 (BIN2) - Body ground Always 9.5 to 14 V
      A93-3 (BIN1) - 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
      K139-19 (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
      K139-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V
      K139-21 (IG1) - Body ground Engine switch on (IG) 9.5 to 14 V

    7. Turn the headlight dimmer switch (light control switch) to the tail or head position.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K139-20 (ILL) - Body ground Headlight dimmer switch (light control switch) in tail or head position 9.5 to 14 V

    9. Turn the engine switch off.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K139-18 (IG2) - Body ground Engine switch off 0 to 1 V
      K139-19 (ACC) - Body ground Engine switch off 0 to 1 V
      K139-21 (IG1) - 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
      Tire Pressure Warning ECU and Receiver (w/ Tire Pressure Warning System)
      Tester Connection Condition Specified Condition
      K139-2 (B41) - Q38-7 (+B) Always Below 1 Ω
      K139-3 (IG41) - Q38-1 (IG) Always Below 1 Ω
      K139-2 (B41) - Body ground Always 10 kΩ or higher
      Q38-7 (+B) - Body ground Always 10 kΩ or higher
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      Q38-1 (IG) - Body ground Always 10 kΩ or higher
      Front Door Inside Handle Illumination Light Assembly RH
      Tester Connection Condition Specified Condition
      K139-2 (B41) - N6-1 (+) Always Below 1 Ω
      K139-2 (B41) - Body ground Always 10 kΩ or higher
      N6-1 (+) - Body ground Always 10 kΩ or higher
      Front Door Inside Handle Illumination Light Assembly LH
      Tester Connection Condition Specified Condition
      K139-2 (B41) - N21-1 (+) Always Below 1 Ω
      K139-2 (B41) - Body ground Always 10 kΩ or higher
      N21-1 (+) - Body ground Always 10 kΩ or higher
      Power Steering ECU Assembly
      Tester Connection Condition Specified Condition
      K139-6 (IG11) - A19-14 (IG) Always Below 1 Ω
      K139-6 (IG11) - Body ground Always 10 kΩ or higher
      A19-14 (IG) - Body ground Always 10 kΩ or higher
      Radio Receiver Assembly (for Audio and Visual System (w/o Parallel Parking Assist Function))
      Tester Connection Condition Specified Condition
      K139-12 (B42) - K70-4 (+B1) Always Below 1 Ω
      K139-15 (AC42) - K70-3 (ACC1) Always Below 1 Ω
      K139-12 (B42) - Body ground Always 10 kΩ or higher
      K70-4 (+B1) - Body ground Always 10 kΩ or higher
      K139-15 (AC42) - Body ground Always 10 kΩ or higher
      K70-3 (ACC1) - Body ground Always 10 kΩ or higher
      Radio Receiver Assembly (w/ Navigation System or Audio and Visual System (w/ Parallel Parking Assist Function))
      Tester Connection Condition Specified Condition
      K139-12 (B42) - K58-17 (+B1) Always Below 1 Ω
      K139-15 (AC42) - K58-16 (ACC1) Always Below 1 Ω
      K139-12 (B42) - Body ground Always 10 kΩ or higher
      K58-17 (+B1) - Body ground Always 10 kΩ or higher
      K139-15 (AC42) - Body ground Always 10 kΩ or higher
      K58-16 (ACC1) - Body ground Always 10 kΩ or higher
      Multi-display assembly (w/ Multi-display)
      Tester Connection Condition Specified Condition
      K139-15 (AC42) - K61-24 (ACC) Always Below 1 Ω
      K139-11 (B43) - K61-12 (B) Always Below 1 Ω
      K139-15 (AC42) - Body ground Always 10 kΩ or higher
      K61-24 (ACC) - Body ground Always 10 kΩ or higher
      K139-11 (B43) - Body ground Always 10 kΩ or higher
      K61-12 (B) - Body ground Always 10 kΩ or higher
      DCM (Telematics Transceiver) (w/ Manual SOS Switch)
      Tester Connection Condition Specified Condition
      K139-16 (B12) - K66-1 (+B) Always Below 1 Ω
      K139-26 (IG13) - K66-7 (IG2) Always Below 1 Ω
      K139-24 (AC41) - K66-8 (ACC) Always Below 1 Ω
      K139-16 (B12) - Body ground Always 10 kΩ or higher
      K66-1 (+B) - Body ground Always 10 kΩ or higher
      K139-26 (IG13) - Body ground Always 10 kΩ or higher
      K66-7 (IG2) - Body ground Always 10 kΩ or higher
      K139-24 (AC41) - Body ground Always 10 kΩ or higher
      K66-8 (ACC) - Body ground Always 10 kΩ or higher
      LEXUS Display Audio Controller (Remote Operation Board) (for Audio and Visual System (w/o Parallel Parking Assist Function))
      Tester Connection Condition Specified Condition
      K139-25 (IL41) - K79-1 (ILL+) Always Below 1 Ω
      K139-24 (AC41) - K79-14 (ACC) Always Below 1 Ω
      K139-25 (IL41) - Body ground Always 10 kΩ or higher
      K79-1 (ILL+) - Body ground Always 10 kΩ or higher
      K139-24 (AC41) - Body ground Always 10 kΩ or higher
      K79-14 (ACC) - Body ground Always 10 kΩ or higher
      Remote Touch (Remote Operation Board) (w/ Navigation System or Audio and Visual System (w/ Parallel Parking Assist Function))
      Tester Connection Condition Specified Condition
      K139-11 (B43) - K78-1 (+B) Always Below 1 Ω
      K139-25 (IL41) - K78-9 (ILL+) Always Below 1 Ω
      K139-24 (AC41) - K78-2 (ACC) Always Below 1 Ω
      K139-11 (B43) - Body ground Always 10 kΩ or higher
      K78-1 (+B) - Body ground Always 10 kΩ or higher
      K139-25 (IL41) - Body ground Always 10 kΩ or higher
      K78-9 (ILL+) - Body ground Always 10 kΩ or higher
      K139-24 (AC41) - Body ground Always 10 kΩ or higher
      K78-2 (ACC) - Body ground Always 10 kΩ or higher
      Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - Q50-5 (BLB) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      Q50-5 (BLB) - Body ground Always 10 kΩ or higher
      Blind Spot Monitor Sensor RH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - Q51-5 (BRB) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      Q51-5 (BRB) - Body ground Always 10 kΩ or higher
      Inner Rear View Mirror Assembly (w/ Auto Glare-resistant EC Mirror)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - S6-1 (IG) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      S6-1 (IG) - Body ground Always 10 kΩ or higher
      Millimeter Wave Radar Sensor Assembly (w/ Pre-crash Safety System)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - B8-5 (IGB) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      B8-5 (IGB) - Body ground Always 10 kΩ or higher
      Driving Support ECU Assembly (w/ Pre-crash Safety System)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - M1-30 (B) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      M1-30 (B) - Body ground Always 10 kΩ or higher
      Network Gateway ECU (w/ Network Gateway ECU)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - K47-10 (IG1) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      K47-10 (IG1) - Body ground Always 10 kΩ or higher
      Lane Departure Warning Camera (w/ Lane Departure Alert System)
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - S9-7 (IGB) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      S9-7 (IGB) - Body ground Always 10 kΩ or higher
      Air Conditioning Amplifier Assembly
      Tester Connection Condition Specified Condition
      K139-3 (IG41) - K65-8 (IG+) Always Below 1 Ω
      K139-25 (IL41) - K65-16 (ILL+) Always Below 1 Ω
      K139-3 (IG41) - Body ground Always 10 kΩ or higher
      K65-8 (IG+) - Body ground Always 10 kΩ or higher
      K139-25 (IL41) - Body ground Always 10 kΩ or higher
      K65-16 (ILL+) - Body ground Always 10 kΩ or higher
      Combination Meter Assembly
      Tester Connection Condition Specified Condition
      K139-10 (IG12) - K3-21 (IG+) Always Below 1 Ω
      K139-10 (IG12) - Body ground Always 10 kΩ or higher
      K3-21 (IG+) - Body ground Always 10 kΩ or higher
      Skid Control ECU (Brake Actuator Assembly)
      Tester Connection Condition Specified Condition
      K139-1 (IG31) - A15-34 (IG1) Always Below 1 Ω
      K139-1 (IG31) - Body ground Always 10 kΩ or higher
      A15-34 (IG1) - Body ground Always 10 kΩ or higher
      Steering Sensor
      Tester Connection Condition Specified Condition
      K139-1 (IG31) - K29-4 (IG1) Always Below 1 Ω
      K139-1 (IG31) - Body ground Always 10 kΩ or higher
      K29-4 (IG1) - Body ground Always 10 kΩ or higher
      Yaw Rate and Acceleration Sensor
      Tester Connection Condition Specified Condition
      K139-1 (IG31) - K85-4 (IG) Always Below 1 Ω
      K139-1 (IG31) - Body ground Always 10 kΩ or higher
      K85-4 (IG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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.

    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
      Q38-7 (+B) - Body ground*1 Always 10.5 to 16 V
      N21-1 (+) - Body ground Always 10.5 to 16 V
      K58-17 (+B1) - Body ground*2 Always 10.5 to 16 V
      K70-4 (+B1) - Body ground*3 Always 10.5 to 16 V
      K66-1 (+B) - Body ground*4 Always 10.5 to 16 V
      K61-12 (B) - Body ground*5 Always 10.5 to 16 V
      K78-1 (+B) - Body ground*2 Always 10.5 to 16 V
      N6-1 (+) - Body ground Always 10.5 to 16 V

    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
      K58-16 (ACC1) - Body ground*2 Engine switch on (ACC) 10.5 to 16 V
      K70-3 (ACC1) - Body ground*3 Engine switch on (ACC) 10.5 to 16 V
      K61-24 (ACC) - Body ground*5 Engine switch on (ACC) 10.5 to 16 V
      K66-8 (ACC) - Body ground*4 Engine switch on (ACC) 10.5 to 16 V
      K79-14 (ACC) - Body ground*3 Engine switch on (ACC) 10.5 to 16 V
      K78-2 (ACC) - Body ground*2 Engine switch on (ACC) 10.5 to 16 V

    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
      K3-21 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V
      A15-34 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      K29-4 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      K85-4 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      A19-14 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      K66-7 (IG2) - Body ground*4 Engine switch on (IG) 10.5 to 16 V
      Q38-1 (IG) - Body ground*1 Engine switch on (IG) 10.5 to 16 V
      Q50-5 (BLB) - Body ground*6 Engine switch on (IG) 10.5 to 16 V
      Q51-5 (BRB) - Body ground*6 Engine switch on (IG) 10.5 to 16 V
      S6-1 (IG) - Body ground*7 Engine switch on (IG) 10.5 to 16 V
      B8-5 (IGB) - Body ground*8 Engine switch on (IG) 10.5 to 16 V
      M1-30 (B) - Body ground*8 Engine switch on (IG) 10.5 to 16 V
      K47-10 (IG1) - Body ground*9 Engine switch on (IG) 10.5 to 16 V
      S9-7 (IGB) - Body ground*10 Engine switch on (IG) 10.5 to 16 V
      K65-8 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V

    7. Turn the headlight dimmer switch (light control switch) to the tail or head position.

    8. 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
      K79-1 (ILL+) - Body ground*3 Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      K78-9 (ILL+) - Body ground*2 Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      K65-16 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V

      • *1: w/ Tire Pressure Warning System

      • *2: w/ Navigation System or Audio and Visual System (w/ Parallel Parking Assist Function)

      • *3: for Audio and Visual System (w/o Parallel Parking Assist Function)

      • *4: w/ Manual SOS Switch

      • *5: w/ Multi-display

      • *6: w/ Blind Spot Monitor System

      • *7: w/ Auto Glare-resistant EC Mirror

      • *8: w/ Pre-crash Safety System

      • *9: w/ Network Gateway ECU

      • *10: w/ Lane Departure Alert System

      Result
      Proceed to
      OK
      NG

    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 (ENGINE STOP AND START ECU - RADIO AND DISPLAY RECEIVER ASSEMBLY OR MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. Disconnect the K70*1 or K58*2 radio and display receiver assembly connector.

    2. Disconnect the K139 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K139-12 (B42) - Body ground Always 10 kΩ or higher
      K70-4 (+B1) - Body ground*1 Always 10 kΩ or higher
      K58-17 (+B1) - Body ground*2 Always 10 kΩ or higher

      • *1: for Audio and Visual System (w/o Parallel Parking Assist Function)

      • *2: w/ Navigation System or Audio and Visual System (w/ Parallel Parking Assist Function)

      Result
      Proceed to
      OK
      NG

    OK

    GO TO AUDIO AND VISUAL SYSTEM w/ Parallel Parking Assist Function: Click here w/o Parallel Parking Assist Function: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR