GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch on.
  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.
  5. Verify that the history code 1 is set.
  6. Refer to Diagnostic Information and Procedures.

Is the history code 1 set?

--

Go to Fasten Safety Belt Indicator/Chime Inoperative in Instrument Panel, Gauges and Console

Go to Step  2

2

  1. Verify that the history code 2 is set.
  2. Refer to Diagnostic Information and Procedures.

Is the history code 2 set?

--

Go to Interior Lamps System Check in Lighting Systems

Go to Step 3

3

  1. Verify that the history code 3 is set.
  2. Refer to diagnostic information and procedures.

Is the history code 3 set?

--

Go to Interior Lamps System Check in Lighting Systems

System OK