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Home >> Nissan-Datsun >> 2021 >> Sentra SR >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Exterior Lighting System - Led Headlamp (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Stop Lamp Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK SYMPTOM 

    Check symptom (A or B)

    Symptom

    A

    Both stop lamps and the high-mounted stop lamp will not turn ON

    B

    Any of the stop lamps and the high-mounted stop lamp will not turn ON

    Which symptom is detected?

    A

    GO TO 2.

    B

    GO TO 9.

  2. CHECK FUSE 
    1. Ignition switch OFF.
    2. Check if any of the following fuse or fusible link are not blown:

      Signal name

      Location

      Fuse No.

      Capacity
      • Battery power supply (stop lamp)
      • Battery power supply (stop lamp switch)

      Fuse block (J/B)

      34

      10 A

      Stop lamp switch signal

    Is the fuse blown (open)?

    YES

    Replace the blown fuse of fusible link after repairing the affected circuit.

    NO

    GO TO 3.

  3. CHECK BATTERY POWER SUPPLY (STOP LAMP) 
    1. Disconnect BCM connector.
    2. Check voltage between BCM harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M20

      139

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace harness.

  4. CHECK STOP LAMP SWITCH POWER SUPPLY 
    1. Disconnect stop lamp switch connector.
    2. Ignition switch ON.
    3. Check voltage between stop lamp switch harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Stop lamp switch

      Connector

      Terminal

      E60

      1

      Ground

      Battery voltage

    YES

    GO TO 5.

    NO

    Repair or replace harness.

  5. CHECK STOP LAMP SWITCH SIGNAL 
    1. Ignition switch OFF.
    2. Connect stop lamp switch connector.
    3. With operating the brake pedal, check voltage between BCM harness connector and ground.

      +

      -

      Condition

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M142

      110

      Ground

      Ignition switch

      ON

      Brake pedal is released

      0 V

      OFF

      ON

      Brake pedal is depressed

      Battery voltage

      OFF

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    GO TO 6.

  6. CHECK STOP LAMP SWITCH 

    Check stop lamp switch. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Replace stop lamp switch. Refer to Removal and Installation .

  7. CHECK STOP LAMP SWITCH CIRCUIT (OPEN) 
    1. Disconnect following connectors:
      • BCM
      • Stop lamp switch
    2. Check continuity between BCM harness connector and stop lamp switch harness connector.

      BCM

      Stop lamp switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M142

      110

      E60

      2

      Yes

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    Repair or replace harness.

  8. CHECK STOP LAMP BULB 

    Check the stop lamp bulb.

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    Repair or replace the malfunctioning part.

  9. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP OUTPUT VOLTAGE 

    SYMBOL CONSULT

    1. Ignition switch ON.
    2. Select "STOP LAMP 1" or "STOP LAMP 2" in "Active Test" mode of "BCM (HEAD LAMP)".
    3. With operating the test items, check voltage between BCM harness connector and ground.
      Stop lamp RH

      +

      -

      Test item

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M21

      157

      Ground

      STOP LAMP 1

      On

      Battery voltage

      Off

      0 V
      Stop lamp LH and high-mounted stop lamp

      +

      -

      Test item

      Voltage

      (Approx.)

      BCM

      Connector

      Terminal

      M21

      160

      Ground

      STOP LAMP 2

      On

      Battery voltage

      Off

      0 V

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    GO TO 11.

  10. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (SHORT) 
    1. Ignition switch OFF.
    2. Disconnect BCM connector.
    3. Check continuity between BCM harness connector and ground.
      Stop lamp RH

      BCM

      --

      Continuity

      Connector

      Terminal

      M21

      157

      Ground

      No
      Stop lamp LH and high-mounted stop lamp

      BCM

      --

      Continuity

      Connector

      Terminal

      M21

      160

      Ground

      No

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    Repair or replace harness.

  11. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP POWER SUPPLY CIRCUIT (OPEN) 
    1. Ignition switch OFF.
    2. Disconnect following connectors:
      • BCM
      • Rear combination lamp LH (body side)
      • Rear combination lamp RH (body side)
      • High-mounted stop lamp
    3. Check continuity between BCM harness connector and each stop lamp harness connector.
      Stop lamp

      BCM

      Rear combination lamp (body side)

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      RH

      M21

      157

      B42

      3

      Yes

      LH

      160

      B25
      High-mounted stop lamp

      BCM

      High-mounted stop lamp

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M21

      160

      B74

      1

      Yes

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    Repair or replace harness.

  12. CHECK STOP LAMP / HIGH-MOUNTED STOP LAMP GROUND CIRCUIT 

    Check continuity between each stop lamp harness connector and ground.

    Stop lamp

    Rear combination lamp (body side)

    --

    Continuity

    Connector

    Terminal

    RH

    B42

    4

    Ground

    Yes

    LH

    B25
    High-mounted stop lamp

    High-mounted stop lamp

    --

    Continuity

    Connector

    Terminal

    B74

    2

    Ground

    Yes

    Is the inspection result normal?

    YES

    Stop lamp: Check the corresponding stop lamp bulb socket or harness. Repair or replace if necessary.

    YES

    High-mounted stop lamp: Replace the high-mounted stop lamp. Refer to Removal and Installation .

    NO

    Repair or replace harness.

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