GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Retrieve and display DTCs by entering the BCM Diagnostic Mode. Refer to On-Board Diagnostic Features in Body Control System.

Did you enter Diagnostic Mode and retrieve DTCs from the BCM?

Go to Step 2

Go to Cannot Enter BCM Diagnostics in Body Control System

2

Did you retrieve both DTCs 12 and 55?

Go to Step 3

Go to Cannot Enter BCM Diagnostics in Body Control System

3

Did you retrieve DTC 23 or 33?

Go to Diagnostic Trouble Code (DTC) List

Go to Step 4

4

Did you retrieve any other DTCs?

Go to Diagnostic Trouble Code (DTC) List in Body Control System

Go to Symptoms - Retained Accessory Power