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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Interior Lighting System (Circuit Diagnosis)) >> Circuit Diagnosis >> Cargo Lamp Control Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

The BCM controls ground to the cargo lamp relay to turn the cargo lamp, tailgate cargo lamps (if equipped) and bed lamps (if equipped) ON and OFF.

CAUTION: Before performing the diagnosis, check that the following is normal.
  • Fuse
  • Cargo lamp bulb
  • Tailgate cargo lamp bulbs (if equipped)
  • Bed lamp bulbs (if equipped)
  1. CHECK CARGO LAMP OPERATION 

    Check the cargo lamp, tailgate cargo lamps (if equipped) and bed lamps (if equipped) operation from the cargo lamp switch, the door switches, and a keyfob.

    Is the cargo lamp, tailgate cargo lamps (if equipped) and bed lamps (if equipped) inoperative from all of the above switches and the keyfob?

    YES

    GO TO 4 .

    NO

  2. CHECK CARGO LAMP SWITCH 

    Check the cargo lamp switch. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 3 .

    NO

    Replace the cargo lamp switch.

  3. CHECK CARGO LAMP SWITCH CIRCUIT 
    1. Disconnect BCM connector M20 and cargo lamp switch connector.
    2. Check continuity between BCM connector M20 terminal 97 and cargo lamp switch connector M149 terminal 1.

      BCM

      Cargo lamp switch

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M20

      97

      M149

      1

      Yes
    3. Check continuity between BCM connector M20 terminal 97 and ground.

      BCM

      (-)

      Continuity

      Connector

      Terminal

      M20

      97

      Ground

      No

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    Repair harness or connectors.

  4. CHECK CARGO LAMP RELAY 

    Check the cargo lamp relay. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    Replace the cargo lamp relay.

  5. CHECK CARGO LAMP RELAY CONTROL 

    While operating the cargo lamp switch, check voltage between BCM connector M19 terminal 42 and ground.

    BCM

    (-)

    Condition

    Voltage

    (Approx.)

    Connector

    Terminal

    M19

    42

    Ground

    Cargo lamp switch

    ON

    0V

    OFF

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 6 .

    NO

    GO TO 8 .

  6. CHECK CARGO LAMP, TAILGATE CARGO LAMPS (IF EQUIPPED) AND BED LAMPS (IF EQUIPPED) VOLTAGE 
    1. Disconnect the cargo lamp connector, the tailgate cargo lamp connectors (if equipped) and bed lamp connectors (if equipped).
    2. While operating the cargo lamp switch, check voltage between cargo lamp connector B11 terminal 2 and ground, the tailgate cargo lamp connectors C13 and C14 terminal 3 and ground and the bed lamp connectors C24, C25, C26 and C27 terminal 1 and ground.

    Each cargo lamp

    (-)

    Condition

    Voltage

    (Approx.)

    Connector

    Terminal

    B11

    2

    Ground

    Cargo lamp switch

    ON

    Battery voltage

    C13

    3

    C14

    3

    C24

    1

    C25

    1

    C26

    1

    C27

    1

    Is the inspection result normal?

    YES

    Replace cargo lamp, tailgate cargo lamp (if equipped) or bed lamp (if equipped). Refer to Removal and Installation (cargo lamp), Removal and Installation (tailgate cargo lamp) (if equipped) or Removal and Installation (bed lamp) (if equipped).

    NO

    GO TO 7 .

  7. CHECK CARGO LAMP RELAY VOLTAGE PART 1 

    Check voltage between cargo lamp relay connector M150 terminal 5 and ground.

    Cargo lamp relay

    (-)

    Voltage

    (Approx.)

    Connector

    Terminal

    M150

    5

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    Repair harness or connectors between cargo lamp relay and cargo lamp.

    NO

    Repair harness or connector between splice and cargo lamp relay.

  8. CHECK CARGO LAMP RELAY VOLTAGE PART 2 

    Check voltage between cargo lamp relay connector M150 terminal 2 and ground.

    Cargo lamp relay

    (-)

    Voltage

    (Approx.)

    Connector

    Terminal

    M150

    2

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Repair harness or connectors.

  9. CHECK CARGO LAMP RELAY CONTROL CIRCUIT 
    1. Disconnect BCM connector M19 and cargo lamp relay connector M150.
    2. Check continuity between BCM connector M19 terminal 42 and cargo lamp relay connector M150 terminal 1.

      BCM

      Cargo lamp relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M19

      42

      M150

      1

      Yes
    3. Check continuity between BCM connector M19 terminal 42 and ground.

      BCM

      (-)

      Continuity

      Connector

      Terminal

      M19

      42

      Ground

      No

    Is the inspection result normal?

    YES

    Replace BCM. Refer to Removal and Installation .

    NO

    Repair harness or connectors.

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