GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Content Theft Deterrent System Check performed?

--

Go to Step 2

Go to Content Theft Deterrent (CTD) System Check

2

Was the BCM Diagnostic System Check performed?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System in Body Control System

3

Turn the headlamp switch to the PARK position.

Do the park lamps turn on?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems in Lighting Systems

4

  1. Remove the key from the ignition switch.
  2. Close all the vehicle doors.
  3. Insert the key in the driver's door key cylinder lock.
  4. Observe the courtesy lights while turning the key to unlock the driver's door.
  5. Wait 40 seconds.
  6. Insert the key in the RF door key cylinder lock.
  7. Observe the courtesy lights and turn the key to unlock the RF door.

Do the courtesy lights turn on for 40 seconds upon unlocking the door with the key?

--

Go to Diagnostic System Check - Body Control System in Body Control System

Go to Interior Lights Dimming System Check in Lighting Systems