For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
DEFINITION: The rear fog lamps are on at all times, or the rear fog lamps are on at all times when the headlamps are on.
1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems
2 |

1. Turn the headlamp and I/P lamp dimmer switch to the HEAD position.
2. Disconnect the rear fog lamp relay.

Are the rear fog lamps still on?

Go to Step 6

Go to Step 3

3 |

1. Disconnect the rear fog lamp module connector.
2. Connect a test lamp between the rear fog lamp module connector terminal E and B+.

Does the test lamp illuminate?

Go to Step 9

Go to Step 4

4 |

1. Connect the rear fog lamp module connector.
2. Connect a test lamp between the rear fog lamp relay connector terminals C1 and B1.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

5 |

1. Disconnect the rear fog lamp module connector.
2. Connect a test lamp between the rear fog lamp relay connector terminals C1 and B1.

Does the test lamp illuminate?

Go to Step 7

Go to Step 10

6 | Test for and repair a short to voltage on CKT 122. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | --
7 | Test for and repair short to ground on CKT 1870. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | --
8 | Replace the rear fog lamp relay. Has the replacement been made? | Go to Step 11 | --
9 |

1. Test for and repair a short to ground on CKT 1977. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
2. If CKT 1977 is OK, replace the rear window wiper/washer and multifunction switch.

Did you find and correct the condition?

Go to Step 11

--

10 | Replace the rear fog lamp relay. Has the replacement been made? | Go to Step 11 | --
11 |

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

Do the rear fog lamps operate properly?

System OK

Go to Step 2