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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 635 (ADAS Control Unit (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC C1A13: Stop Lamp Relay >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK SELF-DIAGNOSIS RESULTS 

    Check if "U1000" is detected other than "C1A13" in "Self Diagnostic Result" of "ICC/ADAS".

    Is "U1000" detected?

    YES

    Perform the CAN communication system inspection. Repair or replace the malfunctioning parts. Refer to DTC Logic .

    NO

    GO TO 2.

  2. CHECK STOP LAMP SWITCH 

    Check that "STOP LAMP SW" operate normally in "DATA MONITOR" of "ICC/ADAS".

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    GO TO 3.

  3. CHECK STOP LAMP SWITCH INSTALLATION 
    1. Turn ignition switch OFF.
    2. Check stop lamp switch for correct installation. Refer to Intermittent Incident .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Adjust stop lamp switch installation. Refer to Adjustment .

  4. CHECK STOP LAMP SWITCH 
    1. Disconnect stop lamp switch connector.
    2. Check stop lamp switch. Refer to Component Inspection (Stop Lamp Switch) .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Replace stop lamp switch.

  5. CHECK STOP LAMP FOR ILLUMINATION 
    1. Turn the ignition switch OFF.
    2. Remove ICC brake hold relay.
    3. Check that the stop lamp is illuminated by depressing the brake pedal to turn the stop lamp ON.

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Check the stop lamp circuit, and repair or replace the malfunctioning parts.

  6. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ECM 
    1. Turn the ignition switch OFF.
    2. Disconnect stop lamp switch, ECM, rear combination lamp (body side) and high-mounted stop lamp connectors.
    3. Check for continuity between the stop lamp switch harness connector and the ECM harness connector.

      VQ35DE

      Stop lamp switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      2

      E16

      122

      Yes

      VQ35DD

      Stop lamp switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      2

      E32

      191

      Yes
    4. Check for continuity between stop lamp switch harness connector and ground.

      Stop lamp switch

      Ground

      Continuity

      Connector

      Terminal

      E38

      2

      No

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair the harnesses or connectors.

  7. CHECK ICC BRAKE HOLD RELAY CIRCUIT 
    1. Connect ECM, rear combination lamp (body side) and high-mounted stop lamp connectors.
    2. Check that the stop lamp does not illuminate when brake pedal is not depressed.

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    GO TO 8.

  8. CHECK ICC BRAKE HOLD RELAY 
    1. Remove ICC brake hold relay
    2. Check ICC brake hold relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Replace ICC brake hold relay.

  9. PERFORM SELF-DIAGNOSIS OF ECM 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "All DTC Reading".
    4. Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE". Refer to DTC Index (VQ35DD) .

    Is any DTC detected?

    YES

    Repair or replace the malfunctioning parts identified by the self-diagnosis result.

    NO

    Replace ADAS control unit. Refer to Removal and Installation .

  10. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Remove ICC brake hold relay.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC brake hold relay harness connector and ground.

      Terminal

      Voltage

      (Approx.)

      (+)

      (-)

      ICC brake hold relay

      Ground

      Connector

      Terminal

      E75

      2

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    Repair or replace ICC brake hold relay power supply circuit.

  11. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ADAS CONTROL UNIT 
    1. Turn ignition switch OFF.
    2. Disconnect ADAS control unit connectors.
    3. Check for continuity between ICC brake hold relay harness connector and ADAS control unit harness connector.

      ICC brake hold relay

      ADAS control unit

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E75

      1

      B104

      17

      Yes
    4. Check for continuity between ICC brake hold relay harness connector and ground.

      ICC brake hold relay

      Ground

      Continuity

      Connector

      Terminal

      E75

      1

      No

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Repair the harnesses or connectors.

  12. CHECK ADAS CONTROL UNIT STANDARD VOLTAGE 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "STOP LAMP" on "Active Test" of "ICC/ADAS", and then check the voltage between ADAS control unit harness connector and ground.

      Terminal

      Condition

      Voltage

      (Approx.)

      (+)

      (-)

      ADAS control unit

      Ground

      Active Test item

      "STOP LAMP"

      Connector

      Terminal

      B104

      17

      Off

      Battery voltage

      On

      0 V

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    Replace ADAS control unit. Refer to Removal and Installation .

  13. CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check the voltage between ICC brake hold relay harness connector and ground.

      Terminal

      Voltage

      (Approx.)

      (+)

      (-)

      ICC brake hold relay

      Ground

      Connector

      Terminal

      E75

      5

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 14.

    NO

    Repair or replace ICC brake hold relay power supply circuit.

  14. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ECM 
    1. Disconnect ECM, rear combination lamp (body side) and high-mounted stop lamp connectors, and remove ICC brake hold relay.
    2. Check for continuity between ICC brake hold relay harness connector and ECM harness connector.

      VQ35DE

      ICC brake hold relay

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E75

      3

      E16

      122

      Yes

      VQ35DD

      ICC brake hold relay

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E75

      3

      E32

      191

      Yes
    3. Check for continuity between ICC brake hold relay harness connector and ground.

      ICC brake hold relay

      Ground

      Continuity

      Connector

      Terminal

      E75

      3

      No

    Is the inspection result normal?

    YES

    GO TO 15.

    NO

    Repair the harnesses or connectors.

  15. CHECK ICC BRAKE HOLD RELAY 
    1. Remove ICC brake hold relay.
    2. Check ICC brake hold relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 16.

    NO

    Replace ICC brake hold relay.

  16. CHECK STOP LAMP SWITCH 

    Check that "STOP LAMP SW" operate normally in "DATA MONITOR" of "ABS".

    Is the inspection result normal?

    YES

    GO TO 21.

    NO

    GO TO 17.

  17. CHECK STOP LAMP SWITCH INSTALLATION 
    1. Turn ignition switch OFF.
    2. Check stop lamp switch for correct installation. Refer to Inspection .

    Is the inspection result normal?

    YES

    GO TO 18.

    NO

    Adjust stop lamp switch installation. Refer to Adjustment .

  18. CHECK STOP LAMP SWITCH 
    1. Disconnect stop lamp switch connector.
    2. Check stop lamp switch. Refer to Component Inspection (Stop Lamp Switch) .

    Is the inspection result normal?

    YES

    GO TO 19.

    NO

    Replace stop lamp switch. Refer to Exploded View .

  19. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Connect stop lamp switch connector.
    2. Check the voltage between stop lamp switch harness connector and ground.

      Terminal

      Voltage

      (Approx.)

      (+)

      (-)

      Stop lamp switch

      Ground

      Connector

      Terminal

      E38

      3

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 20.

    NO

    Repair or replace stop lamp switch power supply circuit.

  20. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Turn ignition switch OFF
    2. Disconnect stop lamp switch, ABS actuator and electric unit (control unit) connectors.
    3. Check for continuity between the stop lamp switch harness connector and the ABS actuator and electric unit (control unit) harness connector.

      VQ35DE

      Stop lamp switch

      ABS actuator and electric unit (control unit)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      4

      E125

      5

      Yes

      VQ35DD

      Stop lamp switch

      ABS actuator and electric unit (control unit)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      4

      E168

      7

      Yes
    4. Check for continuity between stop lamp switch harness connector and ground.

      Stop lamp switch

      Ground

      Continuity

      Connector

      Terminal

      E38

      4

      No

    Is the inspection result normal?

    YES

    GO TO 21.

    NO

    Repair the harnesses or connectors.

  21. PERFORM SELF-DIAGNOSIS OF ECM 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "All DTC Reading".
    4. Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE". Refer to DTC Index (VQ35DD) .

    Is any DTC detected?

    YES

    Repair or replace the malfunctioning parts identified by the self-diagnosis result.

    NO

    GO TO 22.

  22. PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Perform "All DTC Reading".
    4. Check if any DTC is detected in "Self Diagnostic Result" of "ABS". Refer to DTC Index (Type 1) or DTC Index (Type 2).

    Is any DTC detected?

    YES

    Repair or replace the malfunctioning parts identified by the self-diagnosis result.

    NO

    Replace ADAS control unit. Refer to Removal and Installation .

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