Daytime Light Relay Circuit

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 45 located in IPDM E/R to daytime light relay 1 and LH high beam lamp to IPDM E/R, through the high beam fuses, through the RH 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 1 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 1 connector.
3. Turn the ignition switch ON.
4. Check the voltage between the daytime light relay 1 harness connector and ground.





Is battery voltage present?
YES - GO TO 3
NO - GO TO 5
3.CHECK DAYTIME LIGHT RELAY 1 CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E122.
3. Check continuity between the IPDM E/R harness connector and the daytime light relay 1 harness connector.





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





Is the measurement value normal?
YES - GO TO 4
NO - Repair the harnesses or connectors.
4.CHECK DAYTIME LIGHT RELAY 1
Check daytime light relay 1. 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 relay1.
5.CHECK DAYTIME LIGHT RELAY CIRCUIT FOR OPEN
1. Turn the ignition switch OFF.
2. Disconnect IPDM E/R connector E119.
3. Check continuity between the IPDM E/R harness connector and the daytime light relay 1 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
1. Turn ignition switch OFF.
2. Remove daytime light relay 1.
3. Check the continuity between daytime light relay 1 terminals under the following conditions.





Is the inspection result normal?
YES - Inspection End.
NO - Replace daytime light relay 1