GM Service Manual Online
For 1990-2009 cars only

Use the following procedure in order to initiate glow plug operation:

  1. Turn the engine control switch to the H position.
  2. Wait until the glow plug indicator glows.
  3. Crank the engine.
  4. Fully depress the accelerator pedal.
  5. Release the accelerator pedal.
  6. Turn the engine control switch to the START position.
  7. Release the switch when the engine starts.

  8. If the engine does not start after 15 seconds of cranking, repeat the procedure until the engine starts.