PRE-COLLISION SYSTEM, Diagnostic DTC:C1A4B

DTC Code DTC Name
C1A4B Stop Light Relay Circuit

DESCRIPTION

The stop light switch assembly and skid control ECU assembly outputs stop light signals to the No. 3 semiconductor power integration ECU. When the skid control ECU assembly detects a malfunction relating to the stop light circuit, the driving support ECU is notified via CAN communication, and C1A4B is output.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A4B Stop Light Relay Circuit

Diagnosis Condition:


  • +BI1 and +BI2 terminal voltage is 8.9 V or higher

Malfunction status:

Either of the following occurs


  • When STPO is ON, EXO is OFF* and STP is OFF, STP2 is OFF continuously for 0.3 seconds or more

  • When STPO is OFF, EXO is OFF* and STP and STP2 input signal statuses differ continuously for 0.3 seconds or more

  • Power integration system

  • Skid control ECU assembly

  • Harness or connector

  • Rear combination light assembly LH

  • Rear combination light assembly RH

  • Center stop without harness light assembly

  • Light wire

  • No. 3 semiconductor power integration ECU

WIRING DIAGRAM

B000YR8E01

CAUTION / NOTICE / HINT

Note

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting.

Click here

PROCEDURE


  1. CHECK FOR DTCs (POWER INTEGRATION SYSTEM)


    1. Check for DTCs.

      Click here


      Body Electrical > Power Integration No.3 > Trouble Codes

      Tech Tips

      If there is a malfunction in the No. 3 semiconductor integration ECU, integration relay system DTCs may also have been detected. Check the integration relay system first.

      Result
      Result Proceed to
      Power integration system DTCs are not output A
      Power integration system DTCs are output B

    B

    GO TO POWER INTEGRATION SYSTEM Click here

    A

  2. READ VALUE USING GTS (STOP LIGHT INPUT SIGNAL, STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Using the GTS, check the Data List "Stop Light Input Signal", "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Input Signal Stop light switch assembly input condition ON or OFF

      OFF: Brake pedal released

      ON: Brake pedal depressed

      		 -
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Input Signal
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Input Signal Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON ON Connect
      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Input Signal Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON ON Connect A
      ON OFF Connect B
      ON OFF Disconnect C
      OFF OFF Connect D

    B

    GO TO POWER INTEGRATION SYSTEM Click here

    C

    READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) Click here

    D

    CHECK TERMINAL VOLTAGE (STP TERMINAL) Click here

    A

  3. CHECK TERMINAL VOLTAGE (STP, STPO AND STP2 TERMINAL)


    1. B000YXTC02
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the A9 and A10 skid control ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-16(STP) - Body ground Brake pedal depressed 8 to 14 V
      Brake pedal released Below 1.5 V
      A10-4(STPO) - Body ground Engine switch off 8 to 14 V
      A9-14(STP2) - Body ground Brake pedal depressed 8 to 14 V
      Brake pedal released Below 1.5 V

    3. Connect the A9 and A10 skid control ECU assembly connectors.

      Result
      Result Proceed to
      All terminal voltage is normal A
      Only STP terminal voltage abnormal B
      Only STPO terminal voltage abnormal C
      Only STP2 terminal voltage abnormal D
      STPO terminal and STP2 terminal voltage abnormal E

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

    D

    CHECK TERMINAL VOLTAGE (STP2 TERMINAL) Click here

    E

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

    A

  4. PERFORM ACTIVE TEST USING GTS (STOP LIGHT RELAY)


    1. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    2. Perform "Active Test" according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 3 semiconductor power integration ECU ECU (Stop light output) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
      OK
      Stop light turns ON/OFF in response to the GTS operation
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SKID CONTROL ECU ASSEMBLY Click here

    OK

  5. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    3. Perform "Active Test" according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 3 semiconductor power integration ECU ECU (Stop light output) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay

    4. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC C1A4B is not output A
      DTC C1A4B is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

  6. INSPECT SKID CONTROL ECU ASSEMBLY


    1. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    2. Perform "Active Test" according to the display on the GTS.


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay No. 3 semiconductor power integration ECU ECU (Stop light output) ON/OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
    3. B000W4ZC04
      *a

      Component with harness connected

      (No. 3 Semiconductor Power Integration ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X99-14(ACC) - Body ground Active test is ON Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A10 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-4(STPO) - X99-14(ACC) Always Below 1 Ω

    4. Connect the X99 No. 3 semiconductor power integration ECU connector.

    5. Connect the A10 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK TERMINAL VOLTAGE (STP2 TERMINAL)


    1. B000V6LC41
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the A9 skid control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    3. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Disconnect the X64 light wire connector.

    4. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    5. Disconnect the A9 skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X99-1(OUT) - A9-14(STP2) Always Below 1 Ω

    7. Connect the A9 skid control ECU assembly connector.

    8. Connect the X99 No. 3 semiconductor power integration ECU connector.

    9. Connect the X64 light wire connector.

    10. Connect the X69 rear combination light assembly RH connector.

    11. Connect the X70 rear combination light assembly LH connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A9 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    4. Connect the X99 No. 3 semiconductor power integration ECU connector.

    5. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

  11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. Disconnect the A9 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    3. Disconnect the X70 rear combination light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    5. Connect the X70 rear combination light assembly LH connector.

    6. Connect the X99 No. 3 semiconductor power integration ECU connector.

    7. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

  12. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. Disconnect the A9 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    3. Disconnect the X70 rear combination light assembly LH connector.

    4. Disconnect the X69 rear combination light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    6. Connect the X69 rear combination light assembly RH connector.

    7. Connect the X70 rear combination light assembly LH connector.

    8. Connect the X99 No. 3 semiconductor power integration ECU connector.

    9. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CENTER STOP WITHOUT HARNESS LIGHT ASSEMBLY) Click here

  13. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A10 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-4(STPO) or X99-14(ACC) - Body ground Always 10 kΩ or higher

    4. Connect the X99 No. 3 semiconductor power integration ECU connector.

    5. Connect the A10 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - CENTER STOP WITHOUT HARNESS LIGHT ASSEMBLY)


    1. Disconnect the A9 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    3. Disconnect the X70 rear combination light assembly LH connector.

    4. Disconnect the X69 rear combination light assembly RH connector.

    5. Disconnect the center stop without harness light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    7. Connect the center stop without harness light assembly connector.

    8. Connect the X69 rear combination light assembly RH connector.

    9. Connect the X70 rear combination light assembly LH connector.

    10. Connect the X99 No. 3 semiconductor power integration ECU connector.

    11. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP WITHOUT HARNESS LIGHT ASSEMBLY Click here

    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - LIGHT WIRE) Click here

  15. READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Using the GTS, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

    3. Connect the X70 rear combination light assembly LH connector.

      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    A

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    B

    READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) Click here

  16. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - LIGHT WIRE)


    1. Disconnect the A9 skid control ECU assembly connector.

    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    3. Disconnect the X70 rear combination light assembly LH connector.

    4. Disconnect the X69 rear combination light assembly RH connector.

    5. Disconnect the X64 light wire connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A9-14(STP2) - Body ground Brake pedal released Below 1.5 V

    7. Connect the X64 light wire connector.

    8. Connect the X69 rear combination light assembly RH connector.

    9. Connect the X70 rear combination light assembly LH connector.

    10. Connect the X99 No. 3 semiconductor power integration ECU connector.

    11. Connect the A9 skid control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE LIGHT WIRE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Using the GTS, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

    4. Connect the X69 rear combination light assembly RH connector.

    5. Connect the X70 rear combination light assembly LH connector.

      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    A

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    B

  18. READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Disconnect the center stop without harness light assembly connector.

    4. Using the GTS, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

    5. Connect the center stop without harness light assembly connector.

    6. Connect the X69 rear combination light assembly RH connector.

    7. Connect the X70 rear combination light assembly LH connector.

      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    A

    REPLACE CENTER STOP WITHOUT HARNESS LIGHT ASSEMBLY Click here

    B

    READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE) Click here

  19. CHECK TERMINAL VOLTAGE (STP TERMINAL)


    1. B000VWMC03
      *a

      Front view of wire harness connector

      (to No. 3 Semiconductor Power Integration ECU)

      Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X99-10 (STP) - Body ground Brake pedal depressed Below 1.5 V

    3. Connect the X99 No. 3 semiconductor power integration ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Disconnect the X64 light wire connector.

    4. Using the GTS, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

    5. Connect the X64 light wire connector.

    6. Connect the X69 rear combination light assembly RH connector.

    7. Connect the X70 rear combination light assembly LH connector.

      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    A

    REPLACE LIGHT WIRE Click here

    B

  21. READ VALUE USING GTS (STOP LIGHT OUTPUT SIGNAL AND STATUS OF STOP LIGHT FUSE)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Disconnect the X64 light wire connector.

    4. Disconnect the A9 skid control ECU assembly connector.

    5. Using the GTS, check the Data List "Stop Light Output Signal" and "Status of Stop Light Fuse" with the brake pedal operated.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Output Signal Stop light output condition ON or OFF

      OFF:

      Stop light is off

      ON:

      Stop light is on

      		 Stop lights blink during emergency brake signal control
      Status of Stop Light Fuse Stop light fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Stop Light Output Signal
      Status of Stop Light Fuse
      Standard
      Brake pedal operation Data List Display Condition
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect

    6. Connect the A9 skid control ECU assembly connector.

    7. Connect the X64 light wire connector.

    8. Connect the X69 rear combination light assembly RH connector.

    9. Connect the X70 rear combination light assembly LH connector.

      Result
      Brake pedal operation Data List Display Condition Result
      Stop Light Output Signal Status of Stop Light Fuse
      Brake pedal depressed ON Connect A
      OFF Disconnect B

    A

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    B

  22. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the X70 rear combination light assembly LH connector.

    2. Disconnect the X69 rear combination light assembly RH connector.

    3. Disconnect the X64 light wire connector.

    4. Disconnect the A9 skid control ECU assembly connector.

    5. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X99-1 (OUT) or A9-14 (STP2) - Body ground Always 10 kΩ or higher

    7. Connect the X99 No. 3 semiconductor power integration ECU connector.

    8. Connect the A9 skid control ECU assembly connector.

    9. Connect the X64 light wire connector.

    10. Connect the X69 rear combination light assembly RH connector.

    11. Connect the X70 rear combination light assembly LH connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO POWER INTEGRATION SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR