OFF-Road Lamps Switch Circuit

OFF-ROAD LAMPS SWITCH CIRCUIT





Description
The off-road lamps switch sends a momentary ground signal to the BCM requesting the off-road lamps be activated. The BCM controls the off-road lamps relay based on inputs from the combination switch (lighting and turn signal switch), the off-road lamps switch and the off-road lamp cover sensors. If the headlamps are on high beam, the off-road lamp covers are removed and the off-road lamps switch is activated, the BCM grounds the off-road lamp relay. When the off-road lamps relay is energized, power flows from the off-road lamps relay to the off-road lamps assembly.




Component Function Check
1.CHECK OFF-ROAD LAMPS SWITCH OPERATION
Check that the indicator lamp on the off-road lamps switch illuminates from the off-road lamps switch, combination switch (lighting and turn signal switch) and off-road lamp cover sensor.
Is the inspection result normal?
YES - Off-road lamps switch function is OK.
NO - Inoperative from off-road lamps switch only, SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, OFF-Road Lamps.
1.CHECK OFF-ROAD LAMPS SWITCH VOLTAGE
1. Turn the ignition switch OFF.
2. Disconnect the off-road lamps switch connector M80.
3. Turn the ignition switch ON.





4. Check the voltage between the off-road lamps switch connector
M80 terminal 1 and ground.





Is the inspection result normal?
YES - GO TO 3
NO - GO TO 2.
2.CHECK OFF-ROAD LAMPS SWITCH SIGNAL CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector M18.





3. Check continuity between the off-road lamps switch harness connector (A) and BCM harness connector (B).





4. Check continuity between the off-road lamps switch harness connector (A) and ground.





Is inspection result normal?
YES - Replace BCM. Service and Repair.
NO - Repair the harness.
3.CHECK OFF-ROAD LAMPS SWITCH GROUND CIRCUIT
1. Turn the ignition switch OFF.





2. Check continuity between the off-road lamps switch harness connector M80 terminals 2, 6 and ground.





Does continuity exist?
YES - GO TO 4
NO - Repair the harness or connector.
4.CHECK OFF-ROAD LAMPS SWITCH INDICATOR CIRCUIT
1. Disconnect off-road lamps relay.
2. Check continuity between the off-road lamps relay harness connector and off-road lamps switch harness connector.





Does continuity exist?
YES - Check off-road lamps circuit. If OK, Replace off-road lamps switch. If NG, OFF-Road Lamps Circuit.
NO - Repair and replace the harness.