GM Service Manual Online
For 1990-2009 cars only

Exterior Light System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Release the parking brake.
  2. Turn the ignition ON.
  3. Turn the turn signal/headlamp switch to the park position.

Park lamps, rear tail lamps, and license plate lamps are illuminated.

2

  1. Move the turn signal/headlamp switch to the LH turn position.
  2. Move the turn signal/headlamp switch to the RH turn position.
  3. Return the turn switch to the OFF position.

The LH or RH turn signal lamps flash ON and OFF.

    •  Turn Lamps Always On

3

Move the hazard warning switch to the ON position.

The front and rear turn signal lamps flash ON and OFF.

Hazard Lamps Inoperative

4

  1. Move the hazard warning switch to the ON position.
  2. Move the hazard warning switch to the OFF position.
  1. The front and rear turn signal lamps flash ON and OFF.
  2. When the hazard warning switch is off the front and rear turn signal lamps stop flashing.

Hazard Lamps Always On

5

  1. Depress the brake pedal.
  2. Release the brake pedal.
  1. The center high mounted stoplamp (CHMSL) and rear stoplamps are illuminated.
  2. The center high mounted stoplamp (CHMSL) and rear stoplamps turn OFF.

Stop Lamps Inoperative

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