Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||
1 | Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Do the rear fog lamps illuminate? | Go to Step 3 | Go to Step 4 |
3 |
Do the rear fog lamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 13 |
4 | Is only one fog lamp inoperative? | Go to Step 16 | Go to Step 5 |
5 | Do the front fog lamps operate properly? | Go to Step 6 | Go to Fog Lamps Inoperative |
6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 24 |
7 | Connect a fused jumper between the park lamp supply voltage circuit of the rear fog lamp relay and the fog lamps supply voltage circuit of the rear fog lamp relay. Do the rear fog lamps turn on? | Go to Step 8 | Go to Step 15 |
8 | Probe the control circuit of the rear fog lamp relay with a test lamp that is connected to battery voltage. Does the test lamp illuminate? | Go to Step 9 | Go to Step 10 |
9 | Probe the supply voltage circuit of the rear fog lamp relay coil with a test lamp that is connected to ground. Does the test lamp illuminate? | Go to Step 20 | Go to Step 14 |
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 25 |
11 |
Does the test lamp illuminate? | Go to Step 21 | Go to Step 12 |
12 |
Does the test lamp illuminate? | Go to Step 18 | Go to Step 26 |
13 |
Does the test lamp illuminate? | Go to Step 32 | Go to Step 31 |
14 |
Does the test lamp illuminate? | Go to Step 19 | Go to Step 27 |
15 |
Does the test lamp illuminate? | Go to Step 30 | Go to Step 28 |
16 |
Does the test lamp illuminate? | Go to Step 17 | Go to Step 29 |
17 | Probe between the ground circuit and the supply voltage circuit of the inoperative rear fog lamp connector with a test lamp. Does the test lamp illuminate? | Go to Step 22 | Go to Step 30 |
18 | Test for an open or high resistance in the fog lamp relay control circuit of the rear fog lamp relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and complete the repair? | Go to Step 37 | Go to Step 23 |
19 | Test for an open or high resistance in the fog lamp relay coil supply voltage circuit of the rear fog lamp relay. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and complete the repair? | Go to Step 37 | Go to Step 32 |
20 | Inspect for poor connections at the harness connector of the rear 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 37 | Go to Step 35 |
21 | Inspect for poor connections at the harness connector of the rear fog lamp 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 37 | Go to Step 34 |
22 | Inspect for poor connections at the harness connector of the inoperative rear fog lamp. 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 37 | Go to Step 33 |
23 | Inspect for poor connections at the harness connector of the 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 37 | Go to Step 36 |
24 | Repair an open or high resistance in the park lamp supply voltage circuit of the rear fog lamp relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
25 | Repair an open or high resistance in the ground circuit of the rear fog lamp switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
26 | Repair an open or high resistance in the signal circuit of the rear fog lamp switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
27 | Repair an open or high resistance in the input relay coil supply voltage circuit of the diode module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
28 | Repair an open or high resistance in the supply voltage circuit of the rear fog lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
29 | Repair an open or high resistance in the supply voltage circuit of the inoperative rear fog lamp. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
30 | Repair an open or high resistance in the ground circuit of the inoperative rear fog lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
31 | Repair an open or high resistance in the headlamp switch signal circuit of the inoperative rear fog lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 37 | -- |
32 | Replace the diode module. Did you complete the replacement? | Go to Step 37 | -- |
33 | Replace the inoperative rear fog lamp. Refer to Rear Fog Lamp Bulb Replacement . Did you complete the replacement? | Go to Step 37 | -- |
34 | Replace the rear fog lamp switch. Refer to Rear Fog Lamp Switch Replacement . Did you complete the replacement? | Go to Step 37 | -- |
35 | Replace the rear fog lamp relay. Refer to Fog Lamp Relay Replacement . Did you complete the replacement? | Go to Step 37 | -- |
36 |
Important: Perform the set up procedure for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 37 | -- |
37 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
