Diagnostic Aids

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.

If the DTC B2627 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground in the instrument panel lamps supply voltage circuit.
- The BCM is intermittently shorted to ground.

DTC B2625

Step	Action	Yes	No
Schematic Reference: Interior Lights Dimming Schematics and Interior Lights 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 DIAGNOSTIC SYSTEM CHECK - VEHICLE
2	Turn the ignition to the ON position. Place the headlamp switch in the park position. Operate the instrument panel (I/P) dimmer switch from full dim to full bright. The I/P lamps illuminate and vary intensity?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Test the I/P lamps supply voltage circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 5	Go to Step 4
4	Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 5	-
5	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK