Test Description
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 2: This step tests the ambient light sensor reference voltage circuit for a short to battery positive voltage.
DTC B2645
| Step | Action | Value(s) | 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? | - | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 |
|
12 V | Go to Step 4 | Go to Step 3 |
| 3 | Inspect the ambient light sensor return circuit for a short to battery positive voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 7 | Go to Step 6 |
| 4 | Inspect the ambient light sensor reference voltage circuit for a short to battery positive voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 7 | Go to Step 5 |
| 5 |
IMPORTANT:
Perform the set up procedure for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration
in Body Control Systems. Replace the body control module. Refer to Body Control Module Replacement
in Body Control System.Did you complete the replacement? |
- | Go to Step 7 | - |
| 6 | Replace the ambient light sensor. Refer to Daytime Running Lamps (DRL) Ambient Light Sensor Replacement . Did you complete the replacement? |
- | Go to Step 7 | - |
| 7 |
|
- | Go to Step 2 | System OK |