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 remain illuminated? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | With a scan tool, observe the Front Fog Lamp Switch parameter, or the Rear Fog Lamp Switch parameter (w/T79) in the Instrument Panel Integration Module (IPM) Non-HVAC data list. Does the scan tool indicate that the Fog Lamp Switch parameter is OFF? | Go to Step 4 | Go to Step 7 |
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 10 |
5 |
Did the fog lamps turn OFF? | Go to Step 6 | Go to Step 15 |
6 | Connect a test lamp between the control circuit of the appropriate fog lamp relay and the ignition 1 voltage circuit of the fog lamp relay coil. Does the test lamp illuminate? | Go to Step 8 | Go to Step 11 |
7 |
Does the scan tool indicate that the Fog Lamp Switch parameter is OFF? | Go to Step 12 | Go to Step 9 |
8 | Test the control circuit of the appropriate fog lamp relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 14 |
9 | Test the fog lamp switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 13 |
10 | 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 20 | Go to Step 13 |
11 | Inspect for poor connections at the FOG LP relay, or the RR FOG LP relay (w/ T79). 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 20 | Go to Step 16 |
12 | Inspect for poor connections at the harness connector of the headlamp switch, or the IP Dimmer/Fog Lamp Switch (w/ T79). 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 20 | Go to Step 17 |
13 | Inspect for poor connections at the harness connector of the Instrument Panel Integration Module (IPM). 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 20 | Go to Step 18 |
14 | Inspect for poor connections at the harness connector of the Dash Integration Module (DIM), or Rear Integration Module (RIM) (w/ T79). 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 20 | Go to Step 19 |
15 | Repair a short to battery positive voltage in the fog lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 20 | -- |
16 | Replace the FOG LP relay, or the RR FOG LP relay (w/T79). Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 20 | -- |
17 | Replace the headlamp switch, or the IP Dimmer/Fog Lamp Switch (w/T79). Refer to Headlamp Switch Replacement or Fog Lamp and Instrument Panel Lamp Dimmer Switch Replacement . Did you complete the replacement? | Go to Step 20 | -- |
18 |
Important:: Perform the setup procedure for the Instrument Panel Integration Module (IPM). Refer to Body Control Module (BCM) Programming/RPO Configuration . Replace the IPM. Refer to Instrument Panel Module Replacement in Body Controls. Did you complete the replacement? | Go to Step 20 | -- |
19 |
Important:: Perform the setup procedure for the appropriate control module. Refer to Body Control Module (BCM) Programming/RPO Configuration . Replace the DIM, or the RIM (w/T79). Refer to Dash Integration Module Replacement or Rear Integration Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 20 | -- |
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
