Step | Action | Yes | No | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||||||||||||||||||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |||||||||||||||||
2 | Verify that the rear fog lamps are always on. Do the rear fog lamps operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||||||||||||
3 | Use the scan tool to inspect for the following related body control module (BCM) Data/ Input Parameters and Output Controls. Refer to Scan Tool Data List for typical values and definitions:
Did you find and correct a problem? | Go to Step 13 | Go to Step 4 | ||||||||||||||||
4 | Use the scan tool to monitor the rear fog lamp switch input with the switch in the OFF position. Does the scan tool indicate that the switch is ON? | Go to Step 7 | Go to Step 5 | ||||||||||||||||
5 | Remove the rear fog lamp relay. Do the rear fog lamps turn OFF? | Go to Step 6 | Go to Step 8 | ||||||||||||||||
6 | Using a J 39200 digital multimeter (DMM), check for continuity to ground the rear fog lamp relay control circuit at the fog lamp relay connector in the underhood fuse block. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems. Is continuity present? | Go to Step 9 | Go to Step 11 | ||||||||||||||||
7 | Disconnect the rear fog lamp switch and test the rear fog lamp switch signal circuit for a short to ground. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 10 | Go to Step 12 | ||||||||||||||||
8 | Repair the short to voltage in the rear fog lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- | ||||||||||||||||
9 | Repair the short to ground in the rear fog lamp relay control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- | ||||||||||||||||
10 | Repair the short to ground in the rear fog lamp switch signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- | ||||||||||||||||
11 | Replace the rear fog lamp relay. Refer to Fog Lamp Relay Replacement . Did you complete the repair? | Go to Step 13 | -- | ||||||||||||||||
12 | Replace the rear fog lamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? | Go to Step 13 | -- | ||||||||||||||||
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | ||||||||||||||||
