Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||
1 | Did you review the Lighting System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 | Verify that the fog lamps are inoperative. Does the system operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems | Go to Step 3 |
3 | Inspect the fog lamp and fog lamp cancel relay supply voltage circuit for battery positive voltage between the lighting fuse and the fog lamp and fog lamp cancel relays. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and complete the repair? | Go to Step 16 | Go to Step 4 |
4 | With the fog lamps in the ON position, test the fog lamp relay signal circuit at the headlamp switch for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 5 | Go to Step 15 |
5 | With the fog lamps in the ON position, test the fog lamp relay signal circuit at the fog lamp cancel relay for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 6 | Go to Step 10 |
6 | With the fog lamps in the ON position, test the fog lamp relay signal circuit output at the fog lamp cancel relay for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 7 | Go to Step 14 |
7 | With the fog lamps in the ON position, test the fog lamp relay signal circuit output at the fog lamp relay for continuity to ground. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 8 | Go to Step 11 |
8 | Inspect the fog lamp relay ground circuit for a ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and complete the repair? | Go to Step 16 | Go to Step 9 |
9 | With the fog lamps in the ON position, test the fog lamp supply voltage circuit output at the fog lamp relay for battery positive voltage. Refer to Circuit Testing in Wiring Systems. Is ground present? | Go to Step 12 | Go to Step 13 |
10 | Repair the open or high resistance in the fog lamp switch signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
11 | Repair the open or high resistance in the fog lamp switch signal circuit between the fog lamp cancel relay and the fog lamp relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
12 | Repair the open or high resistance in the fog lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
13 | Replace the fog lamp relay. Refer to Circuit Protection - Fusible Links in Wiring Systems. Did you complete the replacement? | Go to Step 16 | -- |
14 | Replace the fog lamp cancel relay. Refer to Circuit Protection - Fusible Links in Wiring Systems. Did you complete the replacement? | Go to Step 16 | -- |
15 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 16 | |
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
