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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Driver Assistance System (DCA) (Diagnostic Trouble Codes (DTCS), Symptom Diagnosis And R & I) (Except Hybrid) >> DTC/Circuit Diagnosis >> DTC C1A05: Brake SW/Stop Lamp SW >> Diagnosis Procedure

Diagnosis Procedure

Regarding Wiring Diagram information, refer to WIRING DIAGRAM .

  1. CHECK SELF-DIAGNOSIS RESULTS

    1. Perform "All DTC Reading" with CONSULT.
    2. Check if the "U1000" is detected other than "C1A05" 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 STEP 2. 

  2. CHECK STOP LAMP SWITCH AND BRAKE PEDAL POSITION SWITCH

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

    Is the inspection result normal?

    YES 

    GO TO STEP 3. 

    NO-1 

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

    NO-2 

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

  3. CHECK STOP LAMP SWITCH

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

    Is the inspection result normal?

    YES 

    GO TO STEP 14. 

    NO 

    GO TO STEP 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 STEP 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 STEP 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.
      Terminals Voltage
      (Approx.)
      (+) (-)
      Brake pedal position switch Ground
      Connector Terminal
      E72 1 Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 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
      E72 2 E32 140 Yes
    4. Check for continuity between brake pedal position switch harness connector and ground.
      Brake pedal position switch Ground Continuity
      Connector Terminal
      E72 2 No

    Is the inspection result normal?

    YES 

    GO TO STEP 8. 

    NO 

    Repair the harnesses or connectors.

  8. 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 .

    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 STEP 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 STEP 11. 

    NO 

    Replace stop lamp switch.

  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

    1. Turn the ignition switch ON.
    2. Check voltage between stop lamp switch harness connector and ground.
      Terminals Voltage
      (Approx.)
      (+) (-)
      Stop lamp switch Ground
      Connector Terminal
      E38 1 Battery voltage
      3

    Is the inspection result normal?

    YES 

    GO TO STEP 12. 

    NO 

    Repair the harnesses or connectors.

  12. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ECM

    1. Turn ignition switch OFF
    2. Disconnect ECM, rear combination lamp and high-mounted stop lamp connectors.
    3. Check for continuity between stop lamp switch harness connector and ECM harness connector.
      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E38 2 E32 139 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 STEP 13. 

    NO 

    Repair the harnesses or connectors.

  13. CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

    1. Disconnect ABS actuator and electric unit (control unit) connector.
    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 4 E125 5 Yes
    3. 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 STEP 14. 

    NO 

    Repair the harnesses or connectors.

  14. 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 .

    Is any DTC detected?

    YES 

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

    NO 

    GO TO STEP 15. 

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

    Check if any DTC is detected in "Self Diagnostic Result" 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 the ADAS control unit. Refer to REMOVAL AND INSTALLATION .

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