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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1074 (Exterior Lighting System) >> DTC/Circuit Diagnosis >> Headlamp (Lo) Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM " or "WIRING DIAGRAM ".

  1. CHECK HEADLAMP (LO) FUSES
    1. Turn the ignition switch OFF.
    2. Check that the following fuses are not open.
      Unit Location Fuse No. Capacity
      Headlamp LO (LH) IPDM E/R 40 15A
      Headlamp LO (RH) IPDM E/R 41 15A

      Is the fuse open? 

      YES: Replace the fuse after repairing the affected circuit.

      NO: GO TO 2

  2. CHECK HEADLAMP (LO) OUTPUT VOLTAGE
    1. Turn the ignition switch OFF.
    2. Disconnect the front headlamp connector.
    3. Turn the ignition switch ON.
    4. Turn the low beam headlamps ON.
    5. With the low beam headlamps ON, check the voltage between the headlamp connector terminal 3 and ground.
      Fig 1: Checking Voltage Between Headlamp Connector Terminal 3 And Ground
      G08168695Courtesy of NISSAN NORTH AMERICA, INC.
      (+) (-) Voltage
      Connector Terminal
      LH E11 (without DTRL) 3 Ground Battery voltage
      E6 (with DTRL)
      RH E107

      Is battery voltage present? 

      YES: GO TO  8

      NO (Except LH with DTRL) >> CHECK HEADLAMP (LO) CIRCUIT FOR OPEN GO TO 3

      NO (LH with DTRL) >> CHECK HEADLAMP (LO) CIRCUIT FOR OPEN GO TO  4

  3. CHECK HEADLAMP (LO) CIRCUIT FOR OPEN (EXCEPT LH WITH DTRL)
    1. Turn the ignition switch OFF.
    2. Disconnect IPDM E/R connector E123.
    3. Check continuity between the IPDM E/R harness connector (A) and the front headlamp harness connector (B).
      A B Continuity
      Connector Terminal Connector Terminal
      LH E123 52 E11 3 Yes
      RH 54 E107
      Fig 2: Checking Continuity Between IPDM E/R Connector Terminals And Front Headlamp Connector Terminal
      G08168696Courtesy of NISSAN NORTH AMERICA, INC.

      Does continuity exist? 

      YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

      NO: Repair the harnesses or connectors.

  4. CHECK HEADLAMP (LO) CIRCUIT FOR OPEN (LH WITH DTRL)
    1. Turn the ignition switch OFF.
    2. Disconnect IPDM E/R connector E123 and daytime light relay 2 connector.
    3. Check continuity between the IPDM E/R harness connector and the daytime light relay 2 harness connector.
      IPDM E/R Daytime light relay 2 Continuity
      Connector Terminal Connector Terminal
      E123 52 E104 5 Yes
      2
    4. Check continuity between the daytime light relay 2 harness connector and the front headlamp LH harness connector.
      Daytime light relay 2 Front headlamp LH Continuity
      Connector Terminal Connector Terminal
      E104 3 E6 3 Yes

      Does continuity exist? 

      YES: GO TO 5

      NO: Repair the harnesses or connectors.

  5. CHECK DAYTIME LIGHT RELAY 2 CIRCUIT FOR OPEN
    1. Check continuity between the daytime light relay 2 harness connector and the front headlamp LH harness connector.
      Daytime light relay 2 Front headlamp LH Continuity
      Connector Terminal Connector Terminal
      E104 3 E6 3 Yes
    2. Check continuity between the daytime light relay 2 harness connector and ground.
      Daytime light relay 2 Ground Continuity
      Connector Terminal
      E104 3 No

      Is the measurement value normal? 

      YES: GO TO 6

      NO: Repair the harnesses or connectors.

  6. CHECK DAYTIME LIGHT RELAY 2 GROUND CIRCUIT

    Check continuity between daytime light relay 2 harness connector and ground.

    Daytime light relay 2 Ground Continuity
    Connector Terminal
    E104 1 Yes

    Does continuity exist? 

    YES: GO TO 7

    NO: Repair the harness or connector.

  7. CHECK DAYTIME LIGHT RELAY 2

    Check daytime light relay 2. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NO: Replace daytime light relay 2.

  8. CHECK FRONT HEADLAMP (LO) GROUND CIRCUIT

    Check continuity between the front headlamp harness connector terminal 2 and ground.

    Connector Terminal - Continuity
    LH E11 (without DTRL) 2 Ground Yes
    E6 (with DTRL)
    RH E107
    Fig 3: Checking Continuity Between Front Headlamp Connector Terminal 2 And Ground
    G08168697Courtesy of NISSAN NORTH AMERICA, INC.

    Does continuity exist? 

    YES: Inspect the headlamp bulb.

    NO (Except LH with DTRL) >> Repair the harness.

    NO (LH with DTRL) >> GO TO 9

  9. CHECK CONTINUITY BETWEEN FRONT HEADLAMP LH (HI) AND DAYTIME LIGHT RELAY 1
    1. Disconnect daytime light relay 1 connector.
    2. Check continuity between front headlamp LH harness connector and daytime light relay 1 harness connector.
      Front headlamp LH Daytime light relay 1 Continuity
      Connector Terminal Connector Terminal
      E6 2 E103 3 Yes

      Does continuity exist? 

      YES: GO TO 10

      NO: Repair the harness or connector.

  10. CHECK DAYTIME LIGHT RELAY 1 GROUND CIRCUIT

    Check continuity between daytime light relay 1 harness connector and ground.

    Daytime light relay 1 Ground Continuity
    Connector Terminal
    E103 4 Yes

    Does continuity exist? 

    YES: GO TO 11

    NO: Repair the harness or connector.

  11. CHECK DAYTIME LIGHT RELAY 1

    Check daytime light relay 1. Refer to "COMPONENT INSPECTION "

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NO: Replace daytime light relay 1.

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