GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Yukon - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Interior Lamps System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Place the courtesy lamp switch in OFF.

All of the interior lamps are off.

Courtesy or Dome Lamps Always On

2

Place the courtesy lamp switch in ON.

The courtesy lamps turn on.

Courtesy or Dome Lamps Always On

3

Open and close each door one at a time.
    • The courtesy lamps turn on for approximately 25 seconds.
    • The courtesy lamps fade out each time.

4

Press the unlock button on the keyless entry transmitter.
    • Courtesy lamps turn on for approximately 40 seconds.
    • Courtesy lamps fade out.

5
  1. Open the IP compartment.
  2. Close the IP compartment.

The IP compartment lamp turns on once the compartment is open, then turns off when the compartment is shut.

Instrument Panel Compartment Lamp Inoperative

6
  1. Turn each reading switch to ON.
  2. Open each sunshade mirror cover.
  3. Close each sunshade mirror cover.
    • The reading lamps turn on.
    • The sunshade mirrors lamp turn on.
    • The sunshade mirror lamp goes out.

Vanity Mirror Lamp Inoperative

7

Place the headlamp switch in the PARK position.
  1. The component illumination lamps light.
  2. The ashtray lamp lights.

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