Component Tests and General Diagnostics

DAYTIME LIGHT RELAY CIRCUIT





Description
The BCM sends a daytime light request to the IPDM E/R via the CAN communication lines. The power flows backward through fuse 54 located in IPDM E/R to daytime light relay and RH high beam lamp to IPDM E/R, through the high beam fuses, through the LH high beam lamp and on to ground. The high beam lamps are wired in series which causes them to illuminate at a reduced intensity.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Daytime Running Lamp.
1.CHECK DAYTIME LIGHT RELAY FUSE
1. Turn the ignition switch OFF.
2. Check that the following fuse is not open.





Is the fuse open?
YES - Replace the fuse after repairing the affected circuit.
NO - GO TO 2
2.CHECK IPDM E/R OUTPUT SIGNAL
1. Turn the ignition switch OFF.
2. Disconnect the daytime light relay connector.
3. Turn the ignition switch ON.
4. Check the voltage between the daytime light relay harness connector and ground.





Is battery voltage present?
YES - GO TO 3
NO - GO TO 5
3.CHECK DAYTIME LIGHT RELAY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E201.
3. Check continuity between the IPDM E/R harness connector and the daytime light relay harness connector.





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





Is the inspection result normal?
YES - GO TO 4
NO - Repair the harnesses or connectors.
4.CHECK DAYTIME LIGHT RELAY
Check daytime light relay. SEE Component Inspection.
Is the inspection result normal?
YES - Check headlamp (HI) circuit. If OK, replace IPDM E/R. Service and Repair. If NG, Headlamp (HI) Circuit.
NO - Replace daytime light relay.
5.CHECK DAYTIME LIGHT RELAY CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E18.
3. Check continuity between the IPDM E/R harness connector and the daytime light relay harness connector.





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




Component Inspection
1. CHECK DAYTIME LIGHT RELAY
1. Turn ignition switch OFF.
2. Remove daytime light relay.
3. Check the continuity between daytime light relay terminals under the following conditions.





Is the inspection result normal?
YES - Inspection End.
NO - Replace daytime light relay.