Diagnosis Procedure

HEADLAMP (HI) CIRCUIT


Description

The IPDM E/R (intelligent power distribution module engine room) controls the headlamp LH high and headlamp RH high relays based on inputs from the BCM via the CAN communication lines. When the headlamp LH high and headlamp RH high relays are 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.





HEADLAMP (HI) CIRCUIT


Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
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 - Repair the harness and replace the fuse.
NO - GO TO 2.
2.CHECK HEADLAMP (HI) OUTPUT VOLTAGE





1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector.
3. Turn the ignition switch ON.
4. Turn the high beam headlamps ON.
5. With the high beam headlamps ON, check the voltage between the combination lamp connector and ground.






Are the voltage readings as specified?
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 connector E123.
3. Check continuity between the IPDM E/R harness connector (A) and the front combination lamp harness connector (B).






Does continuity exist?
YES - GO TO 4.
NO - Repair the harnesses or connectors.
4.CHECK FRONT COMBINATION LAMP (HI) GROUND CIRCUIT





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





Does continuity exist?
YES - Inspect the headlamp bulb.
NO - Repair the harness.