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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Cruise Control System (DTC/Circuit Diagnosis)) >> DTC / Circuit Diagnosis >> DTC C1A05: Brake SW/Stop Lamp SW >> 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 "C1A05" is displayed with DTC "U1000", first diagnose the DTC "U1000".

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable DTC. Refer to DTC Description .

    NO

    GO TO 2.

  2. CHECK STOP LAMP SWITCH AND BRAKE PEDAL POSITION SWITCH 

    Check that "STOP LAMP SW" and "BRAKE SW" operate normally in "Data Monitor" mode of "LASER/RADAR".

    Is the inspection result normal?

    YES

    GO TO 3

    NO

    When "BRAKE SW" operation is malfunctioning: GO TO 4

    NO

    When "STOP LAMP SW" operation is malfunctioning: GO TO 9

  3. CHECK STOP LAMP SWITCH 

    Check that "STOP LAMP SW" operates normally in "Data Monitor" mode of "ABS".

    Is the inspection result normal?

    YES

    GO TO 14

    NO

    GO TO 9

  4. CHECK BRAKE PEDAL POSITION SWITCH INSTALLATION 
    1. Turn ignition switch OFF.
    2. Check brake pedal position switch for correct installation. Refer to Adjustment .

    Is the inspection result normal?

    YES

    GO TO 5

    NO

    Adjust brake pedal position switch installation. Refer to Adjustment .

  5. BRAKE PEDAL POSITION SWITCH INSPECTION 
    1. Disconnect brake pedal position switch connector.
    2. Check brake pedal position switch. Refer to Component Inspection (Brake Pedal Position Switch) .

    Is the inspection result normal?

    YES

    GO TO 6

    NO

    Replace brake pedal position switch.

  6. CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch ON.
    2. Check voltage between brake pedal position switch harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      Brake pedal position switch

      Ground

      Battery voltage

      Connector

      Terminal

      E37

      1

    Is the inspection result normal?

    YES

    GO TO 7

    NO

    Repair the harnesses or connectors.

  7. CHECK HARNESS BETWEEN BRAKE PEDAL POSITION SWITCH AND ECM 
    1. Turn ignition switch OFF
    2. Disconnect ECM connector.
    3. Check for continuity between brake pedal position switch harness connector and ECM harness connector.

      Brake pedal position switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E37

      2

      E10

      140

      Yes
    4. Check for continuity between brake pedal position switch harness connector and ground.

      Brake pedal position switch

      Ground

      Continuity

      Connector

      Terminal

      E37

      2

      No

    Is the inspection result normal?

    YES

    GO TO 8

    NO

    Repair the harnesses or connectors.

  8. PERFORM SELF DIAGNOSTIC RESULTS OF ECM 

    SYMBOL CONSULT

    1. Connect all connectors if the connectors were disconnected.
    2. Turn ignition switch ON.
    3. Select "Self Diagnostic Result" mode of "ENGINE".
    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

    Replace the ADAS control unit. Refer to Removal and Installation .

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

    Is the inspection result normal?

    YES

    GO TO 10

    NO

    Adjust stop lamp switch installation. Refer to Adjustment .

  10. STOP LAMP SWITCH INSPECTION 
    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 11

    NO

    Replace stop lamp switch.

  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Check voltage between stop lamp switch harness connector and ground.

      (+)

      (-)

      Voltage

      (Approx.)

      Stop lamp switch

      Ground

      Battery voltage

      Connector

      Terminal

      E38

      4

    Is the inspection result normal?

    YES

    GO TO 12

    NO

    Repair the harnesses or connectors.

  12. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Disconnect ABS actuator and electric unit (control unit) connector and resistor.
    2. Check for continuity between stop lamp switch harness connector and ABS actuator and electric unit (control unit) harness connector.

      Stop lamp switch

      ABS actuator and electric unit (control unit)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      3

      E53

      7

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

      Stop lamp switch

      Ground

      Continuity

      Connector

      Terminal

      E38

      3

      No

    Is the inspection result normal?

    YES

    GO TO 13

    NO

    Repair the harnesses or connectors.

  13. PERFORM SELF DIAGNOSTIC RESULT OF ECM 
    1. Connect all connectors 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" 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 14

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

    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

    Repair the distance sensor (ICC sensor). Refer to Removal and Installation .

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