Headlamp (HI) Circuit

HEADLAMP (HI) CIRCUIT

Description

The IPDM E/R (intelligent power distribution module engine room) controls the headlamp high relay based on inputs from the BCM over the CAN communication lines. When the headlamp high relay is energized, power flows through fuses 34 and 35, located in the IPDM E/R. Power then flows to the front combination lamps to the headlamp high beam.


Component Function Check


1. CHECK HEADLAMP (HI) OPERATION

WITHOUT CONSULT
1.Start IPDM E/R auto active test. Refer to "Diagnosis Description" Diagnosis Description.
2.Check that the headlamp switches to the high beam.
WITH CONSULT
1.Select EXTERNAL LAMP of IPDM E/R active test item.
2.While operating the test items, check that the headlamp switches to the high beam.
HI: Headlamp switches to the high beam.


OFF: Headlamp OFF
Does the headlamp switch to the high beam?
YES- Headlamp (HI) circuit is normal.
NO- Refer to "Diagnosis Procedure" .


Diagnosis Procedure

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

1. CHECK HEADLAMP (HI) 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 (HI) OUTPUT VOLTAGE

CONSULT ACTIVE TEST
1.Turn the ignition switch OFF.
2.Disconnect the front combination lamp harness connector E331 or E327.
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 harness connector and ground.





Revision: March 20122013 Infiniti JX
Is battery voltage present?
YES- GO TO 4.
NO- GO TO 3.

3. CHECK HEADLAMP (HI) CIRCUIT FOR OPEN

1.Turn the ignition switch OFF.
2.Disconnect IPDM E/R harness connector E217.
3.Check continuity between the IPDM E/R harness connector E217 and the front combination lamp harness connector.





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

4. CHECK FRONT COMBINATION LAMP (HI) GROUND CIRCUIT

Check continuity between the front combination lamp harness connector terminal 4 and ground.





Does continuity exist?
YES- Replace the headlamp bulb.
NO - Repair or replace the harness or connector.
Revision: March 20122013 Infiniti JX