STOP AND START SYSTEM(for 8GR-FKS) 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 ignition 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 ignition switch is turned to ON.

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


    The backup boost converter supplies power to:

  • Electronically controlled brake system

  • Power steering system

  • Dynamic radar cruise control system

  • Lane departure alert system

  • Air conditioning system

  • CAN communication system (Network gateway ECU)

  • Blind spot monitor system

  • Meter / Gauge system

  • Remote operation controller assembly

  • Telematics System

  • Tire pressure warning system

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

  • Electric parking brake system

  • Air suspension system

  • Variable gear ratio steering system

  • Dynamic rear steering

  • Parking support alert system

WIRING DIAGRAM

Refer to DTC P323A19.

Click here

CAUTION / NOTICE / HINT

Note


  • 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

  • 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 sensor 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 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

      P323A00

      P323AA2

      P323B29

      P323B38

      		 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: Both of the following will not operate


      • Tire pressure warning system

      • Navigation system

      • Map light assembly

      • Clock assembly

      • Multi-display assembly

      B42 terminal:


      • Navigation system

      B43 terminal: Both of the following will not operate


      • Multi-display assembly

      • Remote operation controller

      • Illumination system

      IG41 terminal: All of the following will not operate


      • Tire pressure warning system

      • Blind spot monitor system

      • CAN communication system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Parking support alert 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)

      		 P323A19 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


      • Tire pressure warning system

      • Blind spot monitor system

      • Electronically controlled brake system

      • Power steering system

      • CAN communication system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Variable gear ratio steering system

      • Dynamic rear steering

      • Parking support alert system

      IG2 terminal: Both of the following will not operate


      • Meter / gauge system

      ACC terminal: All of the following will not operate


      • Telematics system

      • Air conditioning system

      • Multi-display assembly

      • Remote operation controller

      • Telematics system

      • Audio and visual system

      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: Both of the following will not operate


      • Audio and visual system

      • Air conditioning system

      • Multi-display assembly

      • Remote operation controller

      IG11 terminal:


      • The power steering system will not operate

      IG12 terminal:


      • The meter / gauge system will not operate

      IG13 terminal:


      • Telematics system will not operate

      IG31 terminal: All of the following will not operate


      • Electronically controlled brake system

      • Variable gear ratio steering system

      • Dynamic rear steering

      IG41 terminal: All of the following will not operate


      • Tire pressure warning system

      • Blind spot monitor system

      • Dynamic radar cruise control system

      • CAN communication system

      • Lane departure alert system

      • Air conditioning system

      • Parking support alert system

      B12 terminal:


      • Telematics system will not operate

      B41 terminal: Both of the following will not operate


      • Navigation system

      • Multi-display assembly

      • Clock assembly

      • Map light assembly

      • Tire pressure warning system

      B42 terminal:


      • Audio and visual system will not operate

      B43 terminal: Both of the following will not operate


      • Audio and visual system

      • Remote operation controller assembly

      • Illumination system

      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

      • Electronically controlled brake system

      • Power steering system

      • Audio and visual system

      • Navigation system

      • Blind spot monitor system

      • CAN communication system

      • Meter / gauge system

      • Dynamic radar cruise control system

      • Lane departure alert system

      • Air conditioning system

      • Telematics system

      • Clock assembly

      • Map light assembly

      • Multi-display assembly

      • Remote operation controller assembly

      • Illumination system

      • Variable gear ratio steering system

      • Dynamic rear steering

      • Parking support alert system

      • Open in BBC fuse circuit

      • Short in converter circuit

      • Backup boost converter malfunction

      		 Stop and start control prohibited P061519 Does not blink (Due to disabled meter / gauge system) All systems that the converter supplies power to do not operate (see circuit diagram) A

      P30DF62

      P30EF48

      P323A00

      P323A16

      P323AA2

      P323B29

      P323B38

      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 (navigation system) (Returns to normal when the engine switch is turned off) - Does not blink

      If overcurrent is detected in the audio and visual system (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 IG12 and +B)

      • Communication error DTCs may be stored due to short between AC41 and +B

      Tech Tips

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

      Converter circuit malfunction


      • Short between IG12 and +B

      • Short between AC41 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 HARNESS AND CONNECTOR (BIN1 AND BIN2 TERMINALS POWER SOURCE CIRCUIT)


    1. 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
      A33-1 (BIN2) - Body ground Always 9.5 to 14 V
      A33-3 (BIN1) - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY)

    OK

  3. CHECK HARNESS AND CONNECTOR (IG1 AND ACC TERMINALS POWER SOURCE CIRCUIT)


    1. Disconnect the engine stop and start ECU connector.

    2. Turn the engine switch on (ACC).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G84-19 (ACC) - Body ground Engine switch on (ACC) 9.5 to 14 V

    4. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G84-21 (IG1) - Body ground Engine switch on (IG) 9.5 to 14 V
      G84-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G84-25 (ILL) - Body ground Headlight dimmer switch (light control switch) in tail or head position 9.5 to 14 V

    8. Turn the engine switch off.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G84-19 (ACC) - Body ground Engine switch off 0 to 1 V
      G84-21 (IG1) - Body ground Engine switch off 0 to 1 V
      G84-18 (IG2) - Body ground Engine switch off 0 to 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - PASSENGER SIDE JUNCTION BLOCK ASSEMBLY)

    OK

  4. 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
      Power Steering ECU Assembly
      Tester Connection Condition Specified Condition
      G84-6 (IG11) - B1-4 (IG1) Always Below 1 Ω
      G84-6 (IG11) or B1-4 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      Combination Meter Assembly
      Tester Connection Condition Specified Condition
      G84-10 (IG12) - G34-21 (IG+) Always Below 1 Ω
      G84-10 (IG12) or G34-21 (IG+) - Body ground and other terminals Always 10 kΩ or higher
      Telephone Transceiver Assembly
      Tester Connection Condition Specified Condition
      G84-16 (B12) - G56-1 (+B) Always Below 1 Ω
      G84-26 (IG13) - G56-7 (IG2) Always Below 1 Ω
      G84-24 (AC41) - G56-8 (ACC) Always Below 1 Ω
      G84-16 (B12) or G56-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      G84-26 (IG13) or G56-7 (IG2) - Body ground and other terminals Always 10 kΩ or higher
      G84-24 (AC41) or G56-8 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      Skid Control ECU (Brake Actuator Assembly)
      Tester Connection Condition Specified Condition
      G84-1 (IG31) - A9-12 (IG1) Always Below 1 Ω
      G84-1 (IG31) or A9-12 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      Spiral with Sensor Cable Sub-assembly
      Tester Connection Condition Specified Condition
      G84-1 (IG31) - G29-9 (IG1)*1 Always Below 1 Ω
      G84-1 (IG31) - G30-9 (IG1)*2 Always Below 1 Ω
      G84-25 (IL41) - G27-14 (ILL+2) Always Below 1 Ω
      G84-1 (IG31) or G29-9 (IG1)*1 - Body ground and other terminals Always 10 kΩ or higher
      G84-1 (IG31) or G30-9 (IG1)*2 - Body ground and other terminals Always 10 kΩ or higher
      G84-25 (IL41) or G27-14 (ILL+2) - Body ground and other terminals Always 10 kΩ or higher
      Yaw Rate Sensor
      Tester Connection Condition Specified Condition
      G84-1 (IG31) - G42-4 (IG) Always Below 1 Ω
      G84-1 (IG31) or G42-4 (IG) - Body ground and other terminals Always 10 kΩ or higher
      Front Steering Control ECU
      Tester Connection Condition Specified Condition
      G84-1 (IG31) - G79-4 (IG) Always Below 1 Ω
      G84-1 (IG31) or G79-4 (IG) - Body ground and other terminals Always 10 kΩ or higher
      Rear Steering Control ECU
      Tester Connection Condition Specified Condition
      G84-1 (IG31) - P4-9 (IGY) Always Below 1 Ω
      G84-1 (IG31) or P4-9 (IGY) - Body ground and other terminals Always 10 kΩ or higher
      Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - L57-5 (BLB) Always Below 1 Ω
      G84-3 (IG41) or L57-5 (BLB) - Body ground and other terminals Always 10 kΩ or higher
      Blind Spot Monitor Sensor RH (w/ Blind Spot Monitor System)
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - L56-5 (BRB) Always Below 1 Ω
      G84-3 (IG41) or L56-5 (BRB) - Body ground and other terminals Always 10 kΩ or higher
      Network Gateway ECU
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - G66-11 (IG1) Always Below 1 Ω
      G84-3 (IG41) or G66-11 (IG1) - Body ground and other terminals Always 10 kΩ or higher
      Driving Support ECU Assembly (w/ Dynamic Radar Cruise Control System)
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - G68-7 (B) Always Below 1 Ω
      G84-3 (IG41) or G68-7 (B) - Body ground and other terminals Always 10 kΩ or higher
      Forward Recognition Camera (w/ Lane Departure Alert System)
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - N5-7 (IGB) Always Below 1 Ω
      G84-3 (IG41) or N5-7 (IGB) - Body ground and other terminals Always 10 kΩ or higher
      Clearance Warning ECU Assembly
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - L18-1 (IG) Always Below 1 Ω
      G84-3 (IG41) or L18-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      Millimeter Wave Radar Sensor Assembly
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - C6-8 (IGB) Always Below 1 Ω
      G84-3 (IG41) or C6-8 (IGB) - Body ground and other terminals Always 10 kΩ or higher
      Tire Pressure Warning ECU and Receiver
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - L48-1 (IG) Always Below 1 Ω
      G84-2 (B41) - L48-7 (+B) Always Below 1 Ω
      G84-3 (IG41) or L48-1 (IG) - Body ground and other terminals Always 10 kΩ or higher
      G84-2 (B41) or L48-7 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Air Conditioning Control Panel
      Tester Connection Condition Specified Condition
      G84-3 (IG41) - G80-8 (IG+) Always Below 1 Ω
      G84-24 (AC41) - G80-7 (ACC) Always Below 1 Ω
      G84-25 (IL41) - G80-6 (ILL+) Always Below 1 Ω
      G84-3 (IG41) or G80-8 (IG+) - Body ground and other terminals Always 10 kΩ or higher
      G84-24 (AC41) or G80-7 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      G84-25 (IL41) or G80-6 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Radio Receiver Assembly
      Tester Connection Condition Specified Condition
      G84-12 (B42) - G52-4 (+B1) Always Below 1 Ω
      G84-24 (AC41) - G52-15 (ACC1) Always Below 1 Ω
      G84-12 (B42) or G52-4 (+B1) - Body ground and other terminals Always 10 kΩ or higher
      G84-24 (AC41) or G52-15 (ACC1) - Body ground and other terminals Always 10 kΩ or higher
      Navigation ECU
      Tester Connection Condition Specified Condition
      G84-2 (B41) - G55-10 (+B) Always Below 1 Ω
      G84-2 (B41) or G55-10 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Clock Assembly
      Tester Connection Condition Specified Condition
      G84-2 (B41) - G75-1 (B) Always Below 1 Ω
      G84-2 (B41) or G75-1 (B) - Body ground and other terminals Always 10 kΩ or higher
      Map Light Assembly
      Tester Connection Condition Specified Condition
      G84-2 (B41) - N7-19 (+B) Always Below 1 Ω
      G84-2 (B41) or N7-19 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Multi-Display Assembly
      Tester Connection Condition Specified Condition
      G84-11 (B43) - G51-12 (B) Always Below 1 Ω
      G84-24 (AC41) - G51-24 (ACC) Always Below 1 Ω
      G84-2 (B41) - G1-1 (+B) Always Below 1 Ω
      G84-11 (B43) or G51-12 (B) - Body ground and other terminals Always 10 kΩ or higher
      G84-24 (AC41) or G51-24 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      G84-2 (B41) or G1-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Remote Operation Controller Assembly
      Tester Connection Condition Specified Condition
      G84-11 (B43) - G76-1 (+B) Always Below 1 Ω
      G84-24 (AC41) - G76-6 (ACC) Always Below 1 Ω
      G84-11 (B43) or G76-1 (+B) - Body ground and other terminals Always 10 kΩ or higher
      G84-24 (AC41) or G76-6 (ACC) - Body ground and other terminals Always 10 kΩ or higher
      Front Multiplex Network Door ECU RH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - H12-14 (ILL+) Always Below 1 Ω
      G84-11 (B43) or H12-14 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Front Door Inside Handle Illumination Light RH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - H16-1 (+) Always Below 1 Ω
      G84-11 (B43) or H16-1 (+) - Body ground and other terminals Always 10 kΩ or higher
      Front Multiplex Network Door ECU LH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - H31-14 (ILL+) Always Below 1 Ω
      G84-11 (B43) or H31-14 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Front Door Inside Handle Illumination Light LH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - H34-1 (+) Always Below 1 Ω
      G84-11 (B43) or H34-1 (+) - Body ground and other terminals Always 10 kΩ or higher
      Rear Multiplex Network Door ECU RH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - K7-14 (ILL+) Always Below 1 Ω
      G84-11 (B43) or K7-14 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Rear Door Inside Handle Illumination Light RH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - K13-1 (+) Always Below 1 Ω
      G84-11 (B43) or K13-1 (+) - Body ground and other terminals Always 10 kΩ or higher
      Rear Multiplex Network Door ECU LH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - K21-14 (ILL+) Always Below 1 Ω
      G84-11 (B43) or K21-14 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Rear Door Inside Handle Illumination Light LH
      Tester Connection Condition Specified Condition
      G84-11 (B43) - K27-1 (+) Always Below 1 Ω
      G84-11 (B43) or K27-1 (+) - Body ground and other terminals Always 10 kΩ or higher
      Foot Light (No. 2 Interior Illumination Light Assembly)(Passenger Side)
      Tester Connection Condition Specified Condition
      G84-11 (B43) - G19-2 (B) Always Below 1 Ω
      G84-11 (B43) or G19-2 (B) - Body ground and other terminals Always 10 kΩ or higher
      Foot Light (No. 1 Interior Illumination Light Assembly)(Driver Side)
      Tester Connection Condition Specified Condition
      G84-11 (B43) - G18-2 (B) Always Below 1 Ω
      G84-11 (B43) or G18-2 (B) - Body ground and other terminals Always 10 kΩ or higher
      No. 3 Interior Illumination Light Assembly
      Tester Connection Condition Specified Condition
      G84-11 (B43) - S6-2 (+B) Always Below 1 Ω
      G84-11 (B43) or S6-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      No. 3 Interior Illumination Light Assembly
      Tester Connection Condition Specified Condition
      G84-11 (B43) - S14-2 (+B) Always Below 1 Ω
      G84-11 (B43) or S6-2 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Meter Hood Illumination Light Assembly
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G94-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) - G94-3 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G94-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      G84-25 (IL41) or G94-3 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Satelite Switch Set
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G49-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G49-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Integration Control and Panel Assembly
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G72-5 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G72-5 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Seat Memory Switch LH
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - H35-12 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or H35-12 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Seat Memory Switch RH
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - H17-19 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or H17-19 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Front Power Window Regulator Switch Assembly LH (for RHD)
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - I4-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or I4-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Front Power Window Regulator Switch Assembly RH (for LHD)
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - I1-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or I1-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Integration Control and Panel Assembly
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G6-8 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G6-8 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Trip Switch
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G8-3 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G8-3 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Hazard Warning Signal Switch Assembly
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G91-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G91-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      Multiplex Network Master Switch Assembly
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - I5-3 (ILL+)*3 Always Below 1 Ω
      G84-25 (IL41) - I2-3 (ILL+)*4 Always Below 1 Ω
      G84-25 (IL41) or I5-3 (ILL+)*3 - Body ground and other terminals Always 10 kΩ or higher
      G84-25 (IL41) or I2-3 (ILL+)*4 - Body ground and other terminals Always 10 kΩ or higher
      Brake Hold Switch
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G7-2 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G7-2 (ILL+) - Body ground and other terminals Always 10 kΩ or higher
      No.2 Satelite Switch Set
      Tester Connection Condition Specified Condition
      G84-25 (IL41) - G59-1 (ILL+) Always Below 1 Ω
      G84-25 (IL41) or G59-1 (ILL+) - Body ground and other terminals Always 10 kΩ or higher

      • *1: w/ VGRS

      • *2: w/o VGRS

      • *3: for LHD

      • *4: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK ENGINE STOP AND START ECU (OUTPUT VOLTAGE FOR EACH SYSTEM)


    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
      G56-1 (+B) - Body ground Always 10.5 to 16 V
      G52-4 (+B1) - Body ground Always 10.5 to 16 V
      L48-7 (+B) - Body ground Always 10.5 to 16 V
      G55-10 (+B) - Body ground Always 10.5 to 16 V
      G75-1 (B) - Body ground Always 10.5 to 16 V
      N7-19 (+B) - Body ground Always 10.5 to 16 V
      G1-1 (+B) - Body ground Always 10.5 to 16 V
      G51-12 (B) - Body ground Always 10.5 to 16 V
      G76-1 (+B) - Body ground Always 10.5 to 16 V
      H12-14 (ILL+) - Body ground Always 10.5 to 16 V
      H16-1 (+) - Body ground Always 10.5 to 16 V
      H31-14 (ILL+) - Body ground Always 10.5 to 16 V
      H34-1 (+) - Body ground Always 10.5 to 16 V
      K7-14 (ILL+) - Body ground Always 10.5 to 16 V
      K13-1 (+) - Body ground Always 10.5 to 16 V
      K21-14 (ILL+) - Body ground Always 10.5 to 16 V
      K27-1 (+) - Body ground Always 10.5 to 16 V
      G19-2 (B) - Body ground Always 10.5 to 16 V
      G18-2 (B) - Body ground Always 10.5 to 16 V
      S6-2 (+B) - Body ground Always 10.5 to 16 V
      S14-2 (+B) - 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.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G59-1 (ILL+) - Body ground Engine switch on (ACC) 10.5 to 16 V
      G80-7 (ACC) - Body ground Engine switch on (ACC) 10.5 to 16 V
      G52-14 (ACC1) - Body ground Engine switch on (ACC) 10.5 to 16 V
      G51-24 (ACC) - Body ground Engine switch on (ACC) 10.5 to 16 V
      G76-6 (ACC) - Body ground 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
      B1-4 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      G34-21 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V
      G56-7 (IG2) - Body ground Engine switch on (IG) 10.5 to 16 V
      A9-12 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      G29-9 (IG1) - Body ground*1 Engine switch on (IG) 10.5 to 16 V
      G30-9 (IG1) - Body ground*2 Engine switch on (IG) 10.5 to 16 V
      G42-4 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      G79-4 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      P4-9 (IGY) - Body ground Engine switch on (IG) 10.5 to 16 V
      L57-5 (BLB) - Body ground Engine switch on (IG) 10.5 to 16 V
      L56-5 (BRB) - Body ground Engine switch on (IG) 10.5 to 16 V
      G66-11 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      G68-7 (B) - Body ground Engine switch on (IG) 10.5 to 16 V
      N5-7 (IGB) - Body ground Engine switch on (IG) 10.5 to 16 V
      L18-1 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      C6-8 (IGB) - Body ground Engine switch on (IG) 10.5 to 16 V
      L48-1 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      G80-8 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V

      • *1: w/ w/ VGRS

      • *2: w/o VGRS

    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
      G80-6 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G94-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G94-3 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G27-14 (ILL+2) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G72-5 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G49-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      H35-12 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      H17-19 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      I4-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      I1-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G6-8 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G8-3 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G91-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      I5-3 (ILL+)*1 - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      I2-3 (ILL+)*2 - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G7-2 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V
      G59-1 (ILL+) - Body ground Headlight dimmer switch (light control switch) in tail or head position 10.5 to 16 V

      • *1: for LHD

      • *2: for RHD

      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

  6. CHECK AUDIO AND VISUAL SYSTEM


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

    2. Turn the engine switch on (IG).

    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

  7. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - RADIO AND DISPLAY RECEIVER ASSEMBLY)


    1. Disconnect the engine stop and start ECU connector.

    2. Disconnect the radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G84-12 (B42) or G52-4 (+B1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (EXTERNAL BACKUP BOOST CONVERTER (ECO RUN VEHICLE CONVERTER ASSEMBLY) - STEREO COMPONENT AMPLIFIER ASSEMBLY)


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

    2. Disconnect the stereo component amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P9-5 (BO1), L52-1 (+B) or L52-16 (+B2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO NAVIGATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR