For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Daytime Running Lamps (DRL) System Check? | -- | Go to Step 2 | Go to Daytime Running Lights (DRL) System Check
2 |

1. Disconnect the fog lamp relay.
2. Connect a test lamp between terminal 30 and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 19

3 | Connect a fused jumper between terminal 30 and terminal 87. Do the fog lamps light? | -- | Go to Step 4 | Go to Step 20
4 |

1. Turn the headlamp switch to the PARK position.
2. Turn the fog lamp switch on.
3. Connect a test lamp between terminal 85 of the fog lamp relay and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5 |

1. Connect the fog lamp relay.
2. Disconnect the isolation relay.
3. Connect a test lamp between terminal 87A and ground.

Does the test lamp light?

--

Go to Step 8

Go to Step 9

6 | Test CKT 317 for an open. Did you find an open in CKT 317? | -- | Go to Step 21 | Go to Step 7
7 | Replace the fog lamp switch. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
8 | Repair a short to B+ in CKT 11. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
9 | With the headlamp switch in the PARK position and the fog lamp switch turned on, connect a test lamp between terminal 30 of the fog lamp relay and ground. Does the test lamp light? | -- | Go to Step 10 | Go to Step 11
10 | With the headlamp switch in the PARK position and the fog lamp switch turned on, connect a test lamp between terminal 30 and terminal 87 of the fog lamp relay. Does the test lamp light? | -- | Go to Step 13 | Go to Step 14
11 | Test CKT 1317 for an open. Did you find an open in CKT 1317? | -- | Go to Step 22 | Go to Step 12
12 | Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement . Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
13 |

1. With the headlamp switch in the PARK position, turn the ignition switch to the RUN position.
2. Connect a test lamp between terminal 85 and ground.

Does the test lamp light?

--

Go to Step 15

Go to Step 16

14 | Repair an open in CKT 150. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Daytime Running Lights (DRL) System Check | --
15 | Test for an open in CKT 592. Did you find an open in CKT 592? | -- | Go to Step 17 | Go to Step 18
16 | Repair an open in CKT 41. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
17 | Repair an open in CKT 592. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
18 | Replace the isolation relay. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
19 | Repair an open in CKT 740. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
20 | Repair an open in one of the following CKTs; Refer to Wiring Repairs in Wiring Systems:

• | CKT 34

• | CKT 150

• | CKT 250

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

21 | Repair an open in CKT 317. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --
22 | Repair an open in CKT 1317. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Daytime Running Lights (DRL) System Check | --