PRE-COLLISION SYSTEM, Diagnostic DTC:C1A4B

DTC Code DTC Name
C1A4B Stop Light Relay Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) sends a stop light operation request signal to the stop light relay (stop light switch assembly). If the skid control ECU (brake actuator assembly) detects a malfunction in the stop light relay circuit, the driving support ECU assembly stores DTC C1A4B.

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

Both of the following conditions are met:


  1. All of the following conditions are met:


    • 3 seconds have elapsed since the engine switch was turned to ON.

    • The battery voltage is 10 V or more for 3 seconds or more.

  2. All of the following conditions are met for 1 second or more:


    • Communication between the driving support ECU assembly and skid control ECU (brake actuator assembly) is normal.

    • The driving support ECU assembly receives a stop light relay circuit malfunction signal from the skid control ECU (brake actuator assembly)

Tech Tips

The skid control ECU (brake actuator assembly) will detect a stop light relay circuit malfunction if any of the following conditions are met:


  • When the voltage at the IG1 terminal is between 11 V and 14 V and the stop light illumination output (STPO) signal is on, a signal has not been input to the STP terminal continuously for 0.3 seconds or more.

  • When the voltage at the IG1 terminal is between 11 V and 14 V and the stop light illumination output (STPO) signal is off, the input signals at the STP terminal and STP2 terminal differ continuously for 0.3 seconds or more.

  • Skid control ECU (Brake actuator assembly)

  • Stop light relay (Stop light switch assembly)

  • Rear combination light assembly LH

  • Rear combination light assembly RH

  • Center stop light assembly

  • Rear light assembly LH

  • Rear light assembly RH

  • ECM

  • Certification ECU (Smart key ECU assembly)

  • Shift lock control ECU (Transmission floor shift assembly)

  • Harness or connector

WIRING DIAGRAM

A0028HTE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR)


    1. Turn the engine switch off.

    2. A002CI9C35
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A86 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      A86-26 (STPO) - Body ground Engine switch ON 11 to 14 V
      A86-35 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V

    4. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Result Proceed to
      The voltage is as specified for every terminal. A
      Only the voltage at terminal STP2 is not as specified. B
      Only the voltage at terminal STPO is not as specified. C
      Only the voltage at terminal STP is not as specified. D
      The voltage at both terminal STPO and terminal STP are not as specified. E

    B

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR) Click here

    C

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    D

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR) Click here

    E

    INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) (POWER SOURCE CIRCUIT) Click here

    A

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


    1. Turn the engine switch off.

    2. According to the display on the GTS, perform the Active Test Stop Light Relay.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
      OK
      The stop lights turn on and off correctly in response to the operation of the Active Test.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    OK

  3. CHECK FOR DTCS (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. According to the display on the GTS, perform the Active Test Stop Light Relay.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

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

    3. Check for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      OK
      DTC C1A4B is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

  4. INSPECT SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)


    1. According to the display on the GTS, perform the Active Test Stop Light Relay.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Test possible at vehicle speed of 0 km/h (0 mph)

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
    2. A00296YC64
      *a

      Component with harness connected

      (Stop light relay (stop light switch assembly))

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

      Tech Tips

      Do not disconnect the stop light relay (stop light switch assembly) connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A87-4 (ACC) - Body ground

      Engine switch on (IG)

      (Active test ON)

      		 Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

  5. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR)


    1. Turn the engine switch off.

    2. A002CI9C36
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A86 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    OK

  6. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ECM)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A43 ECM connector.

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


      1. for 1AR-FE:

        Standard Voltage
        Tester Connection Condition Specified Condition
        A86-5 (STP2) or A43-11 (STP) - Body ground Brake pedal depressed 11 to 14 V

      2. for 2GR-FKS:

        Standard Voltage
        Tester Connection Condition Specified Condition
        A86-5 (STP2) or A43-27 (STP) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the A43 ECM connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1AR-FE: Click here
    REPLACE ECM for 2GR-FKS: Click here

    NG

  7. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the F48 shift lock control ECU (transmission floor shift assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) or F48-6 (STP) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the F48 shift lock control ECU (transmission floor shift assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY) for UA80E: Click here for UA80F: Click here for U760E: Click here

    NG

  8. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the F10 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) or F10-2 (STP1) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the F10 certification ECU (smart key ECU assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  9. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A86-5 (STP2) - A87-3 (L) Always Below 1 Ω
      A86-5 (STP2) or A87-3 (L) - Body ground Always 10 kΩ or higher

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) or A87-3 (L) - Body ground Brake pedal released Below 1.5 V

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

  11. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ECM)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A43 ECM connector.

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


      1. for 1AR-FE:

        Standard Voltage
        Tester Connection Condition Specified Condition
        A86-5 (STP2) or A43-11 (STP) - Body ground Brake pedal released Below 1.5 V

      2. for 2GR-FKS:

        Standard Voltage
        Tester Connection Condition Specified Condition
        A86-5 (STP2) or A43-27 (STP) - Body ground Brake pedal released Below 1.5 V

    5. Connect the A43 ECM connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1AR-FE: Click here
    REPLACE ECM for 2GR-FKS: Click here

    NG

  12. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the F48 shift lock control ECU (transmission floor shift assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) or F48-6 (STP) - Body ground Brake pedal released Below 1.5 V

    5. Connect the F48 shift lock control ECU (transmission floor shift assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SHIFT LOCK CONTROL ECU (TRANSMISSION FLOOR SHIFT ASSEMBLY) for UA80E: Click here for UA80F: Click here for U760E: Click here

    NG

  13. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the F10 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-5 (STP2) or F10-2 (STP1) - Body ground Brake pedal released Below 1.5 V

    5. Connect the F10 certification ECU (smart key ECU assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A86-26 (STPO) - A87-4 (ACC) Always Below 1 Ω

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) (POWER SOURCE CIRCUIT)


    1. Turn the engine switch off.

    2. A0029FVC05
      *a

      Front view of wire harness connector

      (to Stop light relay (Stop light switch assembly))

      Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A87-6 (B) - Body ground Engine switch ON 11 to 14 V
      A87-7 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A87-2 (GND) - Body ground Always Below 1 Ω

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) CONNECTOR)


    1. Turn the engine switch off.

    2. A002CI9C37
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A86 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    OK

  17. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the M30 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
      A86-35 (STP) or M30-2 (STP) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the M30 rear combination light assembly LH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

  18. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the M32 rear combination light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or M32-2 (STP) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the M32 rear combination light assembly RH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

  19. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - CENTER STOP LIGHT ASSEMBLY)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the Y1 center stop light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or Y1-2 (B) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the Y1 center stop light assembly connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    NG

  20. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR LIGHT ASSEMBLY LH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the X29 rear light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or X29-2 (B) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the X29 rear light assembly LH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    NG

  21. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR LIGHT ASSEMBLY RH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the X31 rear light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or X31-2 (B) - Body ground Brake pedal depressed 11 to 14 V

    5. Connect the X31 rear light assembly RH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    NG

  22. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A86-35 (STP) - A87-1 (OUT) Always Below 1 Ω
      A86-35 (STP) or A87-1 (OUT) - Body ground Always 10 kΩ or higher

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  23. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or A87-1 (OUT) - Body ground Brake pedal released Below 1.5 V

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

  24. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the M30 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
      A86-35 (STP) or M30-2 (STP) - Body ground Brake pedal released Below 1.5 V

    5. Connect the M30 rear combination light assembly LH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

  25. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the M32 rear combination light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or M32-2 (STP) - Body ground Brake pedal released Below 1.5 V

    5. Connect the M32 rear combination light assembly RH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

  26. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - CENTER STOP LIGHT ASSEMBLY)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the Y1 center stop light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or Y1-2 (B) - Body ground Brake pedal released Below 1.5 V

    5. Connect the Y1 center stop light assembly connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    NG

  27. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR LIGHT ASSEMBLY LH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the X29 rear light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or X29-2 (B) - Body ground Brake pedal released Below 1.5 V

    5. Connect the X29 rear light assembly LH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    NG

  28. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - REAR LIGHT ASSEMBLY RH)


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the X31 rear light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A86-35 (STP) or X31-2 (B) - Body ground Brake pedal released Below 1.5 V

    5. Connect the X31 rear light assembly RH connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  29. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) (POWER SOURCE CIRCUIT)


    1. Turn the engine switch off.

    2. A0029FVC05
      *a

      Front view of wire harness connector

      (to Stop light relay (Stop light switch assembly))

      Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A87-6 (B) - Body ground Engine switch ON 11 to 14 V
      A87-7 (B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A87-2 (GND) - Body ground Always Below 1 Ω

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  30. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the engine switch off.

    2. Disconnect the A86 skid control ECU (brake actuator assembly) connector.

    3. Disconnect the A87 stop light relay (stop light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A86-26 (STPO) or A87-4 (ACC) - Body ground Always 10 kΩ or higher

    5. Connect the A87 stop light relay (stop light switch assembly) connector.

    6. Connect the A86 skid control ECU (brake actuator assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR