Low and High Beams Headlamps Inoperative (with Front Wipers On)

WARNING: This page is about a different car, the 2007 Hummer H2. 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: Lighting Systems Connector End Views or Data Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Place the headlamp switch in the AUTO position. Place the front windshield wipers in the low position. Do the headlamps operate as expected?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Install a scan tool. With a scan tool, observe the Front Wiper Switch parameter in the Body Control Module (BCM) Data List. Does the scan tool indicate that the Front Wiper Switch parameter states Active?	Go to Step 5	Go to Step 4
4	Test the windshield wiper switch signal 2 circuit for high resistance, an open or a short to ground or 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 6
5	Inspect for poor connections at the harness connector of the 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 7
6	Inspect for poor connections at the harness connector of the windshield wiper module. 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 BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 9	-
8	Replace the windshield wiper module. Refer to Wiper Motor Replacement . 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