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Rear Fog Lamps Always On

Rear Fog Lamps Always On

Step Action Yes No
Schematic Reference: Fog Lights Schematics 
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Place the rear fog lamp switch in the OFF position.
  4. With a scan tool, observe the Rear Fog Lamp Relay Cmd. parameter in the rear integration module (RIM) lighting data list.
Does the scan tool indicate the rear fog lamp relay cmd. parameter is OFF?		 Go to Step 3  Go to Step 5 
3
  1. Turn OFF the ignition.
  2. Disconnect the rear fog lamp relay. Refer to Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center) in Wiring Systems.
  3. Turn ON the ignition, with the engine OFF.
Do the rear fog lamps turn OFF?		 Go to Step 4  Go to Step 13 
4
  1. Turn OFF the ignition.
  2. Connect a test lamp between the rear fog lamp relay control side supply voltage circuit and the rear fog lamp relay control circuit.
  3. Place the rear fog lamp switch in the OFF position.
  4. Turn ON the ignition, with the engine OFF.
Does the test lamp illuminate?		 Go to Step 6  Go to Step 12 
5
  1. Turn OFF the ignition.
  2. Disconnect the C2 harness connector at the turn signal/multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Rear Fog Lamp Relay Cmd. parameter in the rear integration module (RIM) lighting data list.
Does the scan tool indicate the rear fog lamp relay cmd. parameter is OFF?		 Go to Step 11  Go to Step 7 
6 Test the rear fog lamp relay control 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 18  Go to Step 10 
7 Test the rear 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 18  Go to Step 8 
8
  1. Turn OFF the ignition.
  2. Disconnect the C3 harness connector at the instrument panel module (IPM).
  3. Turn ON the ignition, with the engine OFF.
Do the rear fog lamps turn OFF?		 Go to Step 9  Go to Step 10 
9 Inspect for poor connections at the harness connector of the 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 18  Go to Step 17 
10 Inspect for poor connections at the harness connector of the RIM. 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 18  Go to Step 14 
11 Inspect for poor connections at the harness connector of the turn signal/multifunction 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 18  Go to Step 15 
12 Inspect for poor connections at 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 18  Go to Step 16 
13 Locate and repair a short to voltage in the rear fog lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did to complete the repair?		 Go to Step 18  -
14 Replace the RIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 18  -
15 Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement .
Did you complete the replacement?		 Go to Step 18  -
16 Replace the rear fog lamp relay. Refer to Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Electrical Center) in Wiring Systems.
Did you complete the replacement?		 Go to Step 18  -
17 Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 18  -
18 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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