Nissan Maxima Service and Repair 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 51 and 52, 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 PCS-11, "Diagnosis Description".
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 LAMPS" of IPDM E/R active test item.
2. While operating the test item, check that the headlamp is turned ON.

LO : Headlamp ON
OFF : Headlamp OFF

Diagnosis Procedure

1.CHECK HEADLAMP (LO) FUSES

1. Turn the ignition switch OFF.
2. Check that the following fuses are not open

2.CHECK HEADLAMP (LO) OUTPUT VOLTAGE

CONSULT

1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector.
3. Turn the ignition switch ON.
4. Select "EXTERNAL LAMPS" of IPDM E/R active test item.
5. With EXTERNAL LAMPS ON, check the voltage between the combination lamp connector and ground.

3.CHECK HEADLAMP (LO) CIRCUIT FOR OPEN

1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E200.
3. Check continuity between the IPDM E/R harness connector (A) and the front combination lamp harness connector (B).

4.CHECK FRONT COMBINATION LAMP (LO) GROUND CIRCUIT

Check continuity between the front combination lamp harness connector terminal and ground.