Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics Connector End View Reference: Master Electrical Component List DEFINITION: Use this chart if either the front or the rear fog lamp is inoperative. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Do both fog lamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Using a scan tool, command the fog lamps on. Do the fog lamps illuminate? | Go to Step 6 | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 5 |
5 | Connect a 10-amp fused jumper wire between the switch side battery positive voltage circuit of the front fog relay and the fog lamp voltage supply circuit of the front fog relay. Do the fog lamps illuminate? | Go to Step 13 | Go to Step 9 |
6 | Using a scan tool, observe the fog lamp switch data parameter while pressing the fog lamp switch. Does the scan tool display active when pressing the switch and inactive when you release the switch? | Go to Step 14 | Go to Step 7 |
7 |
Does the scan tool display inactive? | Go to Step 8 | Go to Step 10 |
8 |
Does the scan tool display active? | Go to Step 15 | Go to Step 11 |
9 | Test for an open, high resistance, or short to ground in the fog lamp voltage supply circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 16 |
10 | Test fog lamp switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 14 |
11 | Test fog lamp switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 14 |
12 | Inspect the front fog lamp fuse for an open. Refer to Power Distribution Schematics . Is the fuse open? | Go to Step 17 | Go to Step 16 |
13 | Inspect for poor connections at the front fog relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 18 |
14 | Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 19 |
15 | Inspect for poor connections at the fog lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs , and Instrument Panel Multifunction Switch Assembly Replacement . Did you find and correct the condition? | Go to Step 22 | Go to Step 20 |
16 | Inspect for poor connections at the fuse block - underhood. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 21 |
17 | Repair a short to ground in the back up lamp voltage supply circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 22 | -- |
18 | Replace the fog lamp relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 22 | -- |
19 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 22 | -- |
20 | Replace the fog lamp switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement . Did you complete the replacement? | Go to Step 22 | -- |
21 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement . Did you complete the replacement? | Go to Step 22 | -- |
22 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
