GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Install the scan tool.
  2. Turn the ignition switch to the ON position.
  3. Select BCM DTC with the scan tool.
  4. Check for any stored DTCs which may have an effect on serial data line communication.
  5. Turn ignition switch OFF.
  6. Remove the scan tool.

No DTCs are stored in memory.

DTC is stored in memory. Go to Diagnostic Trouble Code (DTC) List/Type .

2

Open the driver's door

The courtesy lamps illuminate.

Courtesy or Dome Lamps Inoperative

3

  1. Close the driver's door.
  2. Turn the ignition switch to the ON position.
  3. Turn the LH/RH rearview mirror lamp switches ON and OFF.

The inside rearview mirror convenience lamps illuminate.

4

Open and close the instrument panel glovebox door.

The instrument panel storage compartment lamp illuminates.

Instrument Panel Compartment Lamp Inoperative

5

Open and close the LH/RH vanity mirror covers.

The LH/RH vanity mirror lamps illuminate.

Vanity Mirror Lamp Inoperative

6

Open and close the engine compartment.

The underhood lamp illuminates.

Underhood Lamp Inoperative

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.