Headlamp (LO) Circuit

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 36 and 37, 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 "Diagnosis Description" 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 LAMP 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
Is the headlamp turned ON?
YES- Headlamp (LO) is normal.
NO- Refer to "Diagnosis Procedure" .


Diagnosis Procedure

Regarding Wiring Diagram information - Refer to "Wiring Diagram" Headlamp.

1. CHECK HEADLAMP (LO) FUSES

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





Is the fuse open?
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 E332 or E328.
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 front combination lamp harness connector
E332 or E328 terminal 1 and ground.





Revision: March 20122013 Infiniti JX

Is battery voltage present?
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 E217.
3.Check continuity between the IPDM E/R harness connector and the front combination lamp harness connector E332 or E328.





Does continuity exist?
YES- Replace IPDM E/R. Refer to "Removal and Installation" Service and Repair.
NO- Repair the harness or connector.

4. CHECK FRONT COMBINATION LAMP (LO) GROUND CIRCUIT

Check continuity between the front combination lamp harness connector E332 or E328 terminal 2 and ground.





Does continuity exist?
YES- Perform xenon headlamp diagnosis. Refer to "Diagnosis Procedure" Xenon Headlamp.
NO- Repair the harness or connector.
Revision: March 20122013 Infiniti JX