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 via 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 lamp LH
and RH high beams.


Component Function Check


1. CHECK HEADLAMP (HI) OPERATION

WITHOUT CONSULT
1.Start IPDM E/R auto active test. Diagnosis Description.
2.Check that the headlamp switches to the high beam.
CONSULT
1.Select "EXTERNAL LAMPS" of IPDM E/R active test item.
2.With the test item operating, check that the headlamp switches to high beam.

HI: Headlamp switches to the high beam.
OFF: Headlamp OFF

Does the headlamp switch to high beam?
YES- Headlamp (HI) circuit is normal.
NO- .


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]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- Replace the fuse after repairing the affected circuit.
NO- GO TO 2.

2. CHECK HIGH BEAM BULB

Check the applicable high beam bulb to be sure the proper bulb standard is in use and the bulb is not open.
Is the bulb OK?
YES- GO TO 3.
NO- Replace the bulb.

3. CHECK HEADLAMP (HI) OUTPUT VOLTAGE

1.Turn the ignition switch OFF.
2.Disconnect the front combination lamp connector E25 or E26.
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.





Is battery voltage present?
YES- GO TO 5.
NO- GO TO 4.

4. CHECK HEADLAMP (HI) CIRCUIT FOR OPEN

1.Turn the ignition switch OFF.
2.Disconnect IPDM E/R connector E45.
3.Check continuity between the IPDM E/R harness connector E45 and the front combination lamp harness connector E25 or E26.





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

5. CHECK FRONT COMBINATION LAMP (HI) GROUND CIRCUIT

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





Does continuity exist?
YES- Replace malfunctioning lamp.
NO- Repair the harness or connector (without daytime light system).
- GO TO 6 (with daytime light system).

6. CHECK FRONT COMBINATION LAMP RH TO DAYTIME LIGHT RELAY 1 GROUND CIRCUIT

1.Disconnect daytime light relay 1 connector E37.
2.Check continuity between the daytime light relay 1 harness connector E37 and the front combination lamp
LH harness connector E25.





Does continuity exist?
YES- GO TO 7.
NO- Repair the harnesses or connectors.

7. CHECK DAYTIME LIGHT RELAY 1 GROUND CIRCUIT

Check continuity between the daytime light relay 1 harness connector E37 and ground.





Does continuity exist?
YES- Replace daytime light relay 1.
NO- Repair the harness or connector.