Daytime Running Lamps (DRL) Defeat Inoperative

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Master Electrical Component List
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Cover the ambient light sensor. Turn ON the ignition, with the engine OFF. Rotate the headlamp switch to the defeat position and release. Do the headlamps turn OFF as expected?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	With the scan tool, observe the Headlamp Off Switch parameter. Turn ON the ignition, with the engine OFF. Rotate the headlamp switch to the defeat position and release. Does the parameter switch from Inactive to Active while the headlamps or daytime running lamps (DRL) remain illuminated?	Go to Step 6	Go to Step 4
4	Test the headlamp switch headlamps OFF signal, circuit of the headlamp switch for the following: An open A high resistance A short to ground A short to voltage Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 5
5	Inspect for a poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 7
6	Inspect for a poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 8
7	Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement?	Go to Step 9	-
8	Replace the BCM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement?	Go to Step 9	-
9	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3