GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Corvette 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Daytime Running Lights (DRL) System Check

DRL Diagnostic System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the headlamp switch to the ON position (headlamps on).
  2. Turn the headlamp dimmer switch to the LOW beam position.
  1. The low beam headlamps are ON.
  2. The high beam headlamps are OFF.
    • Headlamps Inoperative-Low Beam .
    • Headlamps Inoperative-Low and High Beams.
    • Headlamp Inoperative-One Lamp.

2
  1. Turn the headlamp dimmer switch to the HIGH beam position.
  2. Return the headlamp dimmer switch to the LOW beam position.
  1. The high beam headlamps are ON.
  2. The high beam indicator is ON.
  3. The low beam headlamps are OFF.
  4. Headlamps return to the low beam position.
    • Headlamps Inoperative-High Beams (and/or High Beam Indicator).
    • Headlamps Inoperative-Low and High Beams.
    • Headlamp Inoperative-One Lamp.

3
  1. Turn the headlamp switch to the OFF position.
  2. Turn the ignition switch to the ON position.
  3. Cover the daytime running lamps ambient light sensor with a dark cloth (Canada only).
  1. Front turn signal lamps illuminate for daytime running lamps (Domestic/Export).
  2. The low beam headlamps are ON (Canada only).
  3. Park, turn and marker lamps illuminate with ambient light sensor covered (Canada only).
    • DRL Headlamps Inoperative (Domestic/Export).
    • DRL Headlamps Inoperative (Canada).
    • Park Lamps Inoperative In Low Light Conditions (Canada).

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