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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Driver Assistance System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> DTC C1A13: Stop Lamp Relay >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 

    If DTC "C1A13" is displayed with DTC "U1000", first diagnose the DTC "U1000".

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Description .

    NO

    GO TO 2 .

  2. CHECK STOP LAMP SWITCH 

    SYMBOL CONSULT

    1. Select "Data Monitor" mode of "ICC/ADAS".
    2. Select "STOP LAMP SW".
    3. Check that the function operates normally according to the following conditions:

    Monitor item

    Condition

    Status

    STOP LAMP SW

    When brake pedal is applied

    ON

    When brake pedal is released

    OFF

    Is the inspection result normal?

    YES

    GO TO 6

    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 Inspection .

    Is the inspection result normal?

    YES

    GO TO 4

    NO

    Adjust stop lamp switch installation. Refer to Adjustment .

  4. CHECK STOP LAMP SWITCH 

    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. Refer to Exploded View .

  5. CHECK STOP LAMP FOR ILLUMINATION 
    1. Remove ICC brake hold relay.
    2. 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

    GO TO 7

  6. CHECK ICC BRAKE HOLD RELAY 

    Check ICC brake hold relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 8

    NO

    Replace ICC brake hold relay.

  7. CHECK STOP LAMP RELAY 

    Check stop lamp relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 12 .

    NO

    Replace stop lamp relay.

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

      Terminal

      Voltage

      (Approx.)

      (+)

      (-)

      ICC brake hold relay

      Ground

      Connector

      Terminal

      E75

      1

      Battery voltage

      3

    Is the inspection result normal?

    YES

    GO TO 9

    NO

    Repair or replace ICC brake hold relay power supply circuit.

  9. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ADAS CONTROL UNIT 
    1. Turn ignition switch OFF.
    2. Disconnect ADAS control unit connector.
    3. Check 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

      2

      B89

      14

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

      ICC brake hold relay

      Ground

      Continuity

      Connector

      Terminal

      E75

      2

      No

    Is the inspection result normal?

    YES

    GO TO 10

    NO

    Repair or replace the harness or connector.

  10. CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ECM 
    1. Disconnect ECM, stop lamp relay, rear combination lamp, and high-mounted stop lamp connectors and remove ICC brake hold relay.
    2. Turn ignition switch ON.
    3. Check voltage between ICC brake hold relay harness connector and ground.

      ICC brake hold relay

      Ground

      Continuity

      Connector

      Terminal

      E75

      5

      No
    4. Turn ignition switch OFF.
    5. Check continuity between ICC brake hold relay harness connector and ECM harness connector.

      ICC brake hold relay

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E75

      5

      E10

      139

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

      ICC brake hold relay

      Ground

      Continuity

      Connector

      Terminal

      E75

      5

      No

    Is the inspection result normal?

    YES

    GO TO 11

    NO

    Repair or replace the harness or connector.

  11. CHECK ICC BRAKE HOLD RELAY CONTROL CIRCUIT 

    SYMBOL CONSULT

    1. Connect all connectors again if the connectors are disconnected.
    2. Select "STOP LAMP" in "Active Test" mode of "ICC/ADAS".
    3. Select "Active Test" and 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

      B89

      14

      OFF

      Battery voltage

      ON

      0 V

    Is the inspection result normal?

    YES

    GO TO 12

    NO

    Replace ADAS control unit. Refer to Removal and Installation .

  12. CHECK STOP LAMP RELAY POWER SUPPLY CIRCUIT 

    Check voltage between stop lamp relay harness connector and ground.

    Terminal

    Voltage

    (Approx.)

    (+)

    (-)

    Stop lamp relay

    Ground

    Connector

    Terminal

    E34

    1

    Battery voltage

    3

    Is the inspection result normal?

    YES

    GO TO 13

    NO

    Repair or replace stop lamp relay power supply circuit.

  13. CHECK HARNESS BETWEEN STOP LAMP RELAY AND ECM 
    1. Turn the ignition switch OFF.
    2. Disconnect stop lamp relay, ECM, ICC brake hold relay, rear combination lamp, and high-mounted stop lamp connectors.
    3. Check continuity between the stop lamp relay harness connector and the ECM harness connector.

      Stop lamp relay

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E34

      5

      E10

      139

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

      Stop lamp relay

      Ground

      Continuity

      Connector

      Terminal

      E34

      5

      No

    Is the inspection result normal?

    YES

    GO TO 14

    NO

    Repair the harness or connector.

  14. CHECK HARNESS BETWEEN STOP LAMP RELAY AND STOP LAMP SWITCH 
    1. Turn the ignition switch OFF.
    2. Disconnect stop lamp switch connector.
    3. Check continuity between the stop lamp relay harness connector and the stop lamp switch harness connector.

      Stop lamp relay

      Stop lamp switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E34

      2

      E38

      2

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

      Stop lamp relay

      Ground

      Continuity

      Connector

      Terminal

      E34

      2

      No

    Is the inspection result normal?

    YES

    GO TO 15

    NO

    Repair the harness or connector.

  15. CHECK STOP LAMP SWITCH GROUND CIRCUIT 

    Check continuity between stop lamp switch harness connector and ground.

    Stop lamp switch

    Ground

    Continuity

    Connector

    Terminal

    E38

    1

    Yes

    Is the inspection result normal?

    YES

    GO TO 16

    NO

    Repair the harness or connector.

  16. PERFORM SELF-DIAGNOSIS OF ECM 

    SYMBOL CONSULT

    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Select "All DTC Reading" mode.
    4. Check if any DTC is detected in "Self Diagnostic Result" mode of "ENGINE". Refer to DTC Index .

    Is any DTC detected?

    YES

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

    NO

    GO TO 17

  17. PERFORM SELF-DIAGNOSIS OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 

    SYMBOL CONSULT

    1. Connect all connectors again if the connectors are disconnected.
    2. Turn ignition switch ON.
    3. Select "All DTC Reading" mode.
    4. Check if any DTC is detected in "Self Diagnostic Result" mode of "ABS". Refer to DTC Index .

    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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