GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C Pickup - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Exterior Lights System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the headlamp switch to the PARK position.
    • Park and side marker lamps light.
    • Tail lamps light.
    • License lamps light.
    • Clearance lamps light (if equipped).
    • Roof marker lamps light (if equipped).
    • Endgate identification lamps light (if equipped).
    •  Stop Lamps Always On
    •  Stop Lamps Always On

2
  1. Depress the brake pedal.
  2. Release the brake pedal.
  1. Stoplamps and the CHMSL light when the brake pedal is depressed.
  2. Stoplamps and the CHMSL turn OFF when the brake pedal is released.
    •  Stop Lamps Inoperative
    •  Stop Lamps Inoperative

3

Depress the hazard lamp switch.

Front and rear hazard lamps flash.

Hazard Lamps Inoperative

4
  1. Turn the ignition switch to the ON position.
  2. Position the turn signal lever to the LH turn position.
  3. Position the turn signal lever to the RH turn position.
  1. LH turn signals and indicator flash while in the LH turn position.
  2. RH turn signals and indicator flash while in the RH turn position.

5

Place the spotlamp switch in the ON position (if equipped).

The spotlamp lights.

Spot Lamp Inoperative

6

Open the vehicle's hood.

The underhood lamp lights.

Underhood Lamp Inoperative

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