For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
DEFINITION: Front fog lamps are always on, or the front fog lamps are on with the fog lamp switch in the OFF position and park lamps on.
1 | Did you perform the Diagnostic System Check - Lighting Systems? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems
2 |

1. Turn the headlamp switch to the PARK position on the headlamp/instrument panel (IP) dimmer switch.
2. Turn the fog lamp switch to the OFF position.
3. Use a test lamp in order to backprobe the rear window wiper/washer and multi-function switch connector C3 terminal E to ground.

Did the test lamp light?

Go to Step 3

Go to Step 6

3 |

1. Disconnect the rear window wiper/washer and multi-function switch connector C3.
2. Use a test lamp in order to backprobe between the rear window wiper/washer and multi-function switch connector C3 terminal E and ground.

Did the test lamp light?

Go to Step 4

Go to Step 5

4 |

1. Disconnect the underhood accessory junction block connector C2.
2. Use a test lamp in order to probe the underhood accessory junction block connector C2 terminal E5 and ground.

Did the test lamp light?

Go to Step 10

Go to Step 9

5 |

1. Replace the rear window wiper/washer and multi-function switch. Refer to Multifunction Switch Assembly Replacement - Instrument Panel
2. Inspect the system.

Is the repair complete?

Go to Step 12

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6 | Remove the fog lamp relay. Did the fog lamps turn off? | Go to Step 11 | Go to Step 7
7 | Disconnect the underhood accessory junction block connector C3. Does one fog lamp stay on and the other fog lamp turn off? | Go to Step 8 | Go to Step 9
8 | Repair a short to B+ in CKT 34 for the affected fog lamp. Is the repair complete? | Go to Step 12 | --
9 | Replace the underhood accessory junction block. Refer to Relay/Fuse Center Replacement Is the repair complete? | Go to Step 12 | --
10 | Repair a short to B+ in CKT 317. Is the repair complete? | Go to Step 12 | --
11 | Replace the fog lamp relay. Is the repair complete? | Go to Step 12 | --
12 |

1. Connect all connectors that were previously disconnected.
2. Verify that the fog lamps operate properly.

Do the fog lamps operate properly?

System OK

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