PRE-COLLISION SYSTEM, Diagnostic DTC:C1A4B

DTC Code DTC Name
C1A4B Stop Light Relay Circuit

DESCRIPTION

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

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

Diagnosis condition:


  • Power switch is on (IG) and auxiliary battery voltage between 8.9 V or more

Malfunction condition:

Either of the following conditions is met:


  • When the stop light illumination output (STPO) signal is on, a signal has not been input to the STP2 terminal for 0.3 seconds or more continuously.

  • When the stop light illumination output (STPO) signal is off, signals input to the STP terminal and STP2 terminal of the skid control ECU (brake booster with master cylinder assembly) differ for 0.3 seconds or more continuously.

  • Skid control ECU (brake booster with master cylinder assembly)

  • Stop light switch assembly

  • Stop light control ECU assembly

  • Rear combination light assembly LH

  • Rear combination light assembly RH

  • Rear light assembly LH

  • Rear light assembly RH

  • Center stop light assembly

  • Hybrid vehicle control ECU

  • Shift lock control unit assembly (Shift lever assembly)

  • Certification ECU (smart key ECU assembly)

  • Harness or connector

  • Vehicle approaching speaker controller*

WIRING DIAGRAM

B002JYDE01
B002IOEE02
B002KNUE01

CAUTION / NOTICE / HINT

Note


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

  • When replacing the skid control ECU (brake booster with master cylinder assembly), perform zero point calibration and store system information.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

PROCEDURE


  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR)


    1. Turn the power switch off.

    2. B002J5VC05
      *a

      Front view of wire harness connector

      (to Skid control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      A57-3 (STPO) - Body ground Power switch on (IG) 11 to 14 V
      A57-6 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V

    4. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      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

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - HYBRID VEHICLE CONTROL ECU) Click here

    C

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY) Click here

    D

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY LH) Click here

    E

    CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL) Click here

    A

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


    1. Turn the power switch off.

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

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

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) ON or 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 (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) Click here

    OK

  3. 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.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light control relay (Stop light switch assembly) ON or 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 (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here

  4. INSPECT SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER 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 Stop light control relay (Stop light switch assembly) ON or OFF Stop lights come on

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      Stop Light Relay
    3. B002HYNC33
      *a Component with harness connected (Stop Light Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A3-9 (ACC) - Body ground Active Test is ON Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for RHD: Click here

    NG

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here

  5. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    5. Connect the A60 hybrid vehicle control ECU connector.

    6. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

  6. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - SHIFT LOCK CONTROL UNIT ASSEMBLY (SHIFT LEVER ASSEMBLY))


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    6. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    7. Connect the A60 hybrid vehicle control ECU connector.

    8. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY (SHIFT LEVER ASSEMBLY) Click here

    NG

  7. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

    5. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    7. Connect the I51 certification ECU (smart key ECU assembly) connector.

    8. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    9. Connect the A60 hybrid vehicle control ECU connector.

    10. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  8. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY)


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

    5. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

    6. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    8. Connect the A3 stop light control ECU assembly connector.

    9. Connect the I51 certification ECU (smart key ECU assembly) connector.

    10. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    11. Connect the A60 hybrid vehicle control ECU connector.

    12. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG (w/o Vehicle Proximity Notification System)
      NG (w/ Vehicle Proximity Notification System)

    OK

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for LHD: Click here for RHD: Click here

    NG (w/ Vehicle Proximity Notification System)

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - VEHICLE APPROACHING SPEAKER CONTROLLER) Click here

    NG (w/o Vehicle Proximity Notification System)

  9. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

    5. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

    6. Disconnect the A3 stop light control ECU assembly connector.

    7. Disconnect the A1 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Always Below 1.5 V

    9. Connect the A1 stop light switch assembly connector.

    10. Connect the A3 stop light control ECU assembly connector.

    11. Connect the I51 certification ECU (smart key ECU assembly) connector.

    12. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    13. Connect the A60 hybrid vehicle control ECU connector.

    14. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A1 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
      A57-33 (STP) - A1-2 (L) Always Below 1 Ω
      A57-33 (STP) or A1-2 (L) - Body ground Always 10 kΩ or higher

    5. Connect the A1 stop light switch assembly connector.

    6. Connect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A3 stop light control ECU assemblyconnector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A57-3 (STPO) - A3-9 (ACC) Always Below 1 Ω

    5. Connect the A3 stop light control ECU assemblyconnector.

    6. Connect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY LH)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 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
      A57-6 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      A57-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    5. Connect the Q16 rear combination light assembly LH connector.

    6. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    NG

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY RH) Click here

  13. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - VEHICLE APPROACHING SPEAKER CONTROLLER)


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

    5. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

    6. Disconnect the A67 vehicle approaching speaker controller connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal depressed 8 to 14 V
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    8. Connect the A67 vehicle approaching speaker controller connector.

    9. Connect the I51 certification ECU (smart key ECU assembly) connector.

    10. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    11. Connect the A60 hybrid vehicle control ECU connector.

    12. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER Click here

    NG

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY) Click here

  14. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT ASSEMBLY RH)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 rear combination light assembly LH connector.

    4. Disconnect the P13 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
      A57-6 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      A57-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    6. Connect the P13 rear combination light assembly RH connector.

    7. Connect the Q16 rear combination light assembly LH connector.

    8. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH Click here

    NG

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR LIGHT ASSEMBLY LH) Click here

  15. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)


    1. Turn the power switch off.

    2. B002J5VC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A60 hybrid vehicle control ECU connector.

    4. Disconnect the I22 shift lock control unit assembly (shift lever assembly) connector.

    5. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

    6. Disconnect the A67 vehicle approaching speaker controller connector.

    7. Disconnect the A3 stop light control ECU assembly connector.

    8. Disconnect the A1 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-33 (STP) - Body ground Brake pedal released Below 1.5 V

    10. Connect the A1 stop light switch assembly connector.

    11. Connect the A3 stop light control ECU assembly connector.

    12. Connect the A67 vehicle approaching speaker controller connector.

    13. Connect the I51 certification ECU (smart key ECU assembly) connector.

    14. Connect the I22 shift lock control unit assembly (shift lever assembly) connector.

    15. Connect the A60 hybrid vehicle control ECU connector.

    16. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 10 Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR LIGHT ASSEMBLY LH)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 rear combination light assembly LH connector.

    4. Disconnect the P13 rear combination light assembly RH connector.

    5. Disconnect the Y11 rear light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-6 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      A57-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    7. Connect the Y11 rear light assembly LH connector.

    8. Connect the P13 rear combination light assembly RH connector.

    9. Connect the Q16 rear combination light assembly LH connector.

    10. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    NG

  17. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR LIGHT ASSEMBLY RH)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 rear combination light assembly LH connector.

    4. Disconnect the P13 rear combination light assembly RH connector.

    5. Disconnect the Y11 rear light assembly LH connector.

    6. Disconnect the Y10 rear light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-6 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      A57-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    8. Connect the Y10 rear light assembly RH connector.

    9. Connect the Y11 rear light assembly LH connector.

    10. Connect the P13 rear combination light assembly RH connector.

    11. Connect the Q16 rear combination light assembly LH connector.

    12. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    NG

  18. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CENTER STOP LIGHT ASSEMBLY)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 rear combination light assembly LH connector.

    4. Disconnect the P13 rear combination light assembly RH connector.

    5. Disconnect the Y11 rear light assembly LH connector.

    6. Disconnect the Y10 rear light assembly RH connector.

    7. Disconnect the e1 center stop light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-6 (STP2) - Body ground Brake pedal depressed 8 to 14 V
      A57-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    9. Connect the e1 center stop light assembly connector.

    10. Connect the Y10 rear light assembly RH connector.

    11. Connect the Y11 rear light assembly LH connector.

    12. Connect the P13 rear combination light assembly RH connector.

    13. Connect the Q16 rear combination light assembly LH connector.

    14. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT ASSEMBLY Click here

    NG

  19. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY)


    1. Turn the power switch off.

    2. B002J5VC07
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the Q16 rear combination light assembly LH connector.

    4. Disconnect the P13 rear combination light assembly RH connector.

    5. Disconnect the Y11 rear light assembly LH connector.

    6. Disconnect the Y10 rear light assembly RH connector.

    7. Disconnect the e1 center stop light assembly connector.

    8. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A57-6 (STP2) - Body ground Always Below 1.5 V

    10. Connect the A3 stop light control ECU assembly connector.

    11. Connect the e1 center stop light assembly connector.

    12. Connect the Y10 rear light assembly RH connector.

    13. Connect the Y11 rear light assembly LH connector.

    14. Connect the P13 rear combination light assembly RH connector.

    15. Connect the Q16 rear combination light assembly LH connector.

    16. Connect the skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  20. CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL)


    1. B002KIJC01
      *a

      Front view of wire harness connector

      (to Stop light control ECU assembly )

      Turn the power switch off.

    2. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A3-6 (+B) - Body ground Always 11 to 14V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-8 (GND) - Body ground Always Below 1 Ω

    5. Connect the A3 stop light control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-1 (OUT) - A57-6 (STP2) Always Below 1 Ω
      A3-1 (OUT) or A57-6 (STP2) - Body ground Always 10 kΩ or higher

    5. Connect the A3 stop light control ECU assembly connector.

    6. Connect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY for LHD: Click here for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL)


    1. B002KIJC01
      *a

      Front view of wire harness connector

      (to Stop light control ECU assembly )

      Turn the power switch off.

    2. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A3-6 (+B) - Body ground Always 11 to 14V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-8 (GND) - Body ground Always Below 1 Ω

    5. Connect the A3 stop light control ECU assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  23. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT CONTROL ECU ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A3 stop light control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-1 (OUT) - A57-6 (STP2) Always Below 1 Ω
      A3-1 (OUT) or A57-6 (STP2) - Body ground Always 10 kΩ or higher

    5. Connect the A3 stop light control ECU assembly connector.

    6. Connect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR