Nissan Sentra Service Manual: Headlamp (lo) circuit

Description

The ipdm e/r (intelligent power distribution module engine room) controls the headlamp low relay based on inputs from the bcm over the can communication lines. When the headlamp low relay is energized, power flows through fuses 43 and 44, located in the ipdm e/r. Power then flows to the front combination lamps to the headlamp low beam.

Component function check

1.Check headlamp (lo) operation

Without consult

1. Start ipdm e/r auto active test. Refer to exl-24, "diagnosis description" (with intelligent key system) or exl-28, "diagnosis description" (without intelligent key system).
2. Check that the headlamp is turned on.

Note:

HI/LO is repeated 1 second each when using the IPDM E/R auto active test.

  Consult

1. Select external lamp of ipdm e/r active test item.
2. While operating the test items, check that the headlamp is turned on.

Lo : headlamp on

Off : headlamp off

Is the inspection result normal? YES >> Headlamp (LO) is normal.

NO >> Refer to EXL-90, "Diagnosis Procedure".

Diagnosis procedure

Regarding Wiring Diagram information, refer to EXL-33, "Wiring Diagram".

1.Check headlamp (lo) fuses

1. Turn the ignition switch off.
2. Check that the following fuses are not blown.

Is the fuse blown? YES >> Replace the fuse after repairing the affected circuit.

NO >> GO TO 2.

2.Check headlamp (lo) output voltage

Consult

1. Turn the ignition switch off.
2. Disconnect the front combination lamp harness connector in question.
3. Turn the ignition switch on.
4. Select external lamp of ipdm e/r active test item.
5. With external lamp on, check the voltage between the combination lamp connector and ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.Check headlamp (lo) circuit for open

1. Turn the ignition switch OFF.
2. Disconnect ipdm e/r connector.
3. Check continuity between the IPDM E/R harness connector and the front combination lamp harness connector.

Is the inspection result normal? Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation" (with intelligent key system) or pcs-58, "removal and installation" (without intelligent key system).

No >> repair or replace the harness or connector.

Is the inspection result normal? Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation" (with intelligent key system) or pcs-58, "removal and installation" (without intelligent key system).

No >> repair or replace the harness or connector.

4.Check front combination lamp (lo) ground circuit

Is the inspection result normal? Yes >> inspect the headlamp bulb.

No >> repair or replace the harness or connector.