Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |
2 |
Do the fog lamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are both fog lamps inoperative? | Go to Step 4 | Go to Step 13 |
4 | With a scan tool, observe the Front Fog Lamp Switch parameter in the Instrument Cluster (IPC) Inputs data list. Does the scan tool display ON? | Go to Step 7 | Go to Step 5 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 15 |
6 | Connect a test lamp between the front fog lamp switch signal circuit and the ground circuit of the fog lamp switch. Does the test lamp illuminate? | Go to Step 21 | Go to Step 23 |
7 | With a scan tool command the Fog Lamp relay ON and OFF. Do you hear a click when you command the Fog Lamp relay ON and OFF? | Go to Step 10 | Go to Step 8 |
8 |
Does the test lamp illuminate? | Go to Step 9 | Go to Step 24 |
9 |
Does the test lamp illuminate? | Go to Step 20 | Go to Step 16 |
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 17 |
11 | Connect a 10 amp fused jumper between the battery positive voltage circuit of the Fog Lamp relay switch and the supply voltage circuit of the fog lamps. Do the fog lamps illuminate? | Go to Step 20 | Go to Step 12 |
12 |
Does the test lamp illuminate? | Go to Step 25 | Go to Step 26 |
13 |
Does the test lamp illuminate? | Go to Step 14 | Go to Step 26 |
14 | Connect a test lamp between the supply voltage circuit of the inoperative fog lamp and the ground circuit of the inoperative fog lamp. Does the test lamp illuminate? | Go to Step 22 | Go to Step 25 |
15 | Test the fog lamp switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 18 |
16 | Test the control circuit of the Fog Lamp relay for an open or short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 19 |
17 | Test for open or short to ground in the battery positive voltage circuit of the Fog Lamp relay switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 26 |
18 | Inspect for poor connections at the Instrument Cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 28 |
19 | Inspect for poor connections at the Body Control Module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 27 |
20 | Inspect for poor connections at the Fog Lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 29 |
21 | Inspect for poor connections at the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 30 |
22 | Inspect for poor connections at the inoperative fog lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 32 | Go to Step 31 |
23 | Repair an open or high resistance in the ground circuit of the fog lamp switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 32 | -- |
24 | Repair an open or short to ground in the ignition-1 voltage circuit of the Fog lamp relay coil. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 32 | -- |
25 | Repair an open or high resistance in the ground circuit of the fog lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 32 | -- |
26 | Repair an open or short to ground in the supply voltage circuit of the fog lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 32 | -- |
27 | Replace the Body Control Module (BCM). Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 32 | -- |
28 | Replace the Instrument Cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console. Did you complete the replacement? | Go to Step 32 | -- |
29 | Replace the Fog Lamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 32 | -- |
30 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 32 | -- |
31 | Replace the inoperative fog lamp bulb. Refer to Front Fog Lamp Bulb Replacement . Did you complete the replacement? | Go to Step 32 | -- |
32 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
