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 48 and 49, 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-III
1. Start IPDM E/R auto active test. 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.
CONSULT-III
1. Select "EXTERNAL LAMP" of IPDM E/R active test item.
2. With operating the test items, check that the headlamp switches to the high beam.






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




Diagnosis Procedure
Regarding Wiring Diagram - Without DTRL information, Coupe With Halogen, Coupe With Xenon (coupe) or Sedan With Halogen, Sedan With Xenon (sedan).
Regarding Wiring Diagram - With DTRL information, Coupe With Xenon, Coupe With Halogen (coupe) or Sedan With Halogen (sedan).
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-III ACTIVE TEST
1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector.
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 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 E200.
3. Check continuity between the IPDM E/R harness connector and the front combination lamp harness connector.





Does continuity exist?
YES - Replace IPDM E/R. 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 and ground.





Does continuity exist?
YES - Inspect the headlamp bulb.
NO (Except RH with DTRL)- Repair the harness.
NO (RH with DTRL)- GO TO 5
5.CHECK CONTINUITY BETWEEN FRONT COMBINATION LAMP RH (HI) AND DAYTIME LIGHT RELAY
1. Disconnect daytime light relay connector.
2. Check continuity between front combination lamp RH harness connector and daytime light relay harness connector.





Does continuity exist?
YES - GO TO 6
NO - Repair the harness or connector.
6.CHECK DAYTIME LIGHT RELAY GROUND CIRCUIT
Check continuity between daytime light relay harness connector and ground.





Does continuity exist?
YES - GO TO 7
NO - Repair the harness or connector.
7.CHECK DAYTIME LIGHT RELAY
Check daytime light relay. Daytime Light Relay Circuit
Is the inspection result normal?
YES - Inspect the loose ground connection.
NO - Replace daytime light relay.