Fog Lamps Always On - Rear

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 Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Turn ON the ignition, with the engine OFF. Turn ON the low beam headlamps. Turn ON the front fog lamps. Observe the rear fog lamps. Turn ON and OFF the rear fog lamps. Turn OFF the ignition. Did the rear fog lamps operate properly?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Install a scan tool. Turn ON the ignition, with the engine OFF. Position the rear fog lamp switch to the OFF position. With a scan tool, observe the Rear Fog Lamp Switch parameter in the dash integration module (DIM) Inputs data list. Does the scan tool indicate that the rear fog lamp switch is parameter Idle?	Go to Step 4	Go to Step 7
4	With a scan tool, observe the Rear Fog Lamp Relay status in the DIM Outputs data list. Does the scan tool indicate the rear fog lamp relay is parameter Off?	Go to Step 5	Go to Step 11
5	Turn OFF the ignition. Disconnect the rear fog lamp relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems. Turn ON the ignition, with the engine OFF. Did the rear fog lamps turn OFF?	Go to Step 6	Go to Step 14
6	Turn OFF the ignition. Connect a test lamp between the rear fog lamp relay control side supply voltage circuit and the fog lamp relay control circuit. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate?	Go to Step 8	Go to Step 13
7	Turn OFF the ignition. Disconnect the multifunction, turn signal switch. Turn ON the ignition, with the engine OFF. With a scan tool observe the Rear Fog Lamp Switch parameter. Does the scan tool indicate the Rear Fog Lamp Switch parameter is Idle?	Go to Step 10	Go to Step 9
8	Test for a short to ground in the fog lamp relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 11
9	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 11
10	Test the rear fog lamp switch signal circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 12
11	Inspect for poor connections at the harness connector of the DIM. 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 harness connector of the multifunction, turn signal 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 16
13	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 17
14	Repair the short to power 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	-
15	IMPORTANT: Perform the setup procedure for the DIM. Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.Did you complete the replacement?	Go to Step 18	-
16	Replace the multifunction, turn signal switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column. Did you complete the replacement?	Go to Step 18	-
17	Replace the rear fog lamp relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems. 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