Headlamp (HI) Circuit Check

Headlamp (HI) Circuit Check

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 lamps to the headlamp high beam.

Component Function Check

1. CHECK HEADLAMP (HI) OPERATION

WITHOUT SDT
1 Start IPDM E/R auto active test. Refer to [Diagnosis System (IPDM E/R): Diagnosis Description] Diagnosis System (IPDM E/R) Diagnosis Description.
2 Check that the headlamp switches to the high beam.

NOTE:
HI/LO is repeated 1 second each when using the IPDM E/R auto active test.

WITH SDT
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.






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

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Headlamp: Wiring Diagram] Headlamp (without DTRL) or [Daytime Light System: Wiring Diagram] [1][2]Daytime Running Lamp (with DTRL).

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

1 Turn the ignition switch OFF.





2 Disconnect the front combination lamp connector E7 (with DTRL), E11 (without DTRL) or E107.
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 front combination lamp connector and ground.






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 connector E123.
3 Check continuity between the IPDM E/R harness connector (A) and the front headlamp harness connector (B).






Does continuity exist?
YES
Replace IPDM E/R. Refer to [IPDM E/R: Removal and Installation of IPDM E/R] Service and Repair.
NO
Repair the harnesses or connectors.

4. CHECK FRONT HEADLAMP (HI) GROUND CIRCUIT

Check continuity between the front headlamp harness connector terminal and ground.











Does continuity exist?
YES
Inspect the headlamp bulb.
NO (Except LH with DTRL)
Repair the harness.
NO (LH with DTRL)
ERROR! Unknown action!GO TO 5.

5. CHECK CONTINUITY BETWEEN FRONT HEADLAMP LH (HI) AND DAYTIME LIGHT RELAY 1

1 Disconnect daytime light relay 1 connector.
2 Check continuity between front headlamp LH harness connector and daytime light relay 1 harness connector.






Does continuity exist?
YES
GO TO 6.
NO
Repair the harness or connector.

6. CHECK DAYTIME LIGHT RELAY 1 GROUND CIRCUIT

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






Does continuity exist?
YES
GO TO 7.
NO
Repair the harness or connector.

7. CHECK DAYTIME LIGHT RELAY 1

Check daytime light relay 1. Refer to [Daytime Light Relay Circuit Check] Testing and Inspection

Is the inspection result normal?
YES
Inspect the headlamp bulb.
NO
Replace daytime light relay 1.