Step | Action | Value(s) | 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 inoperative. Do the rear fog lamps operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||||||||||||||
3 | Is only one rear fog lamp inoperative? | -- | Go to Step 4 | Go to Step 5 | ||||||||||||||||||
4 |
Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
5 | 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 20 | Go to Step 6 | ||||||||||||||||||
6 | With the engine Off, turn the key to RUN and the headlamp switch to PARK. Are the park lamps on? | -- | Go to Step 7 | |||||||||||||||||||
7 | Inspect the FOG LP fuse in the underhood fuse block. Is the fuse open? | -- | Go to Step 8 | Go to Step 9 | ||||||||||||||||||
8 |
Is continuity present? | -- | Go to Step 13 | Go to Step 14 | ||||||||||||||||||
9 | Place the rear fog lamp switch in the ON position. Use the J 39200 DMM to check for the specified voltage of the rear fog lamp supply voltage circuit at either of the fog lamp sockets. Refer to Circuit Testing in Wiring Systems. Is the specified voltage present? | B+ | Go to Step 15 | Go to Step 10 | ||||||||||||||||||
10 | Use the scan tool to monitor the rear fog lamp switch ON input. Does the scan tool indicate that the switch is ON? | -- | Go to Step 11 | Go to Step 12 | ||||||||||||||||||
11 | Test the rear fog lamp supply voltage and the rear fog lamp relay control circuits for an open or high resistance. Refer to Circuit Testing in Wiring Systems. Was a problem found? | -- | Go to Step 16 | Go to Step 18 | ||||||||||||||||||
12 | Test the rear fog lamp switch signal and ground circuits for opens or high resistance. Refer to Circuit Testing in Wiring Systems. Was a problem found? | -- | Go to Step 17 | Go to Step 19 | ||||||||||||||||||
13 | Repair the short to ground in the associated circuit supplied by the FOG LP fuse. Refer to Power Distribution Schematics in Wiring Systems for further diagnosis. Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
14 | Repair the short to ground in the rear fog lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
15 | Repair the open or high resistance in the ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
16 | Repair the open or high resistance in the rear fog lamp supply voltage circuit or the rear fog lamp relay control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
17 | Repair the open or high resistance in the rear fog lamp switch signal circuit or ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
18 | Replace the rear fog lamp relay. Refer to Fog Lamp Relay Replacement . Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
19 | Replace the rear fog lamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? | -- | Go to Step 20 | -- | ||||||||||||||||||
20 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 | ||||||||||||||||||
