GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch to the ON position.
  2. Press and hold the power door unlock switch.
  3. Within 20 seconds of pressing the unlock switch, cycle the headlamps on and off 6 times.
  4. Release the power door lock switch.

Refer to Body Control Module Diagnostic Information .

Is history code 1 set?

--

Go to

in Instrument Panel, Gauges, and Console

Go to Step 2

2

Refer to Body Control Module Diagnostic Information .

Is history code 2 set?

--

Go to Courtesy Lamps Always On in Lighting Systems

Go to Step 3

3

Refer to Body Control Module Diagnostic Information .

Is history code 3 set?

--

Go to Courtesy Lamps Inoperative in Lighting Systems

System OK