Automatic Lamp Control Inoperative

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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 DEFINITION: Automatic headlamps are inoperative.
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. Place the headlamp switch in the AUTO position. Turn ON the ignition, with the engine OFF. Wait 20 seconds. Do the headlamps illuminate?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Disconnect the ambient light sensor. With a scan tool, observe the Day/Night Status parameter. Does the scan tool indicate Night?	Go to Step 4	Go to Step 5
4	Inspect for poor connections at the harness connector of the ambient light sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 8	Go to Step 6
5	Inspect for 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 8	Go to Step 7
6	Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement . Did you complete the replacement?	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 8	-
8	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2