GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Daytime Running Lights (DRL) System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Ensure headlamp switch is in the OFF position.
  2. Ensure park brake is disengaged.
  3. Turn ignition switch to the ON position.
    • DRL indicator illuminates
    • LOW beam headlamps illuminate.
    • Park and tail lamps remain OFF.

2
  1. Turn headlamp switch to the ON position.
  2. Alternate dimmer switch between HIGH and LOW beam positions.
    • DRL indicator turns OFF.
    • Headlamps alternate between HIGH and LOW beams.
    • Park and tail lamps illuminate.
    • High beam indicator illuminates in the high beam position.

3
  1. Turn the headlamp switch to the OFF position.
  2. Engage the park brake.
    • Headlamps turn OFF.
    • DRL headlamps turn OFF.
    • DRL indicator turns OFF

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