GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Prizm 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Twilight Sentinel System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Engage the parking brake.
  2. Start the engine.
    • Headlights OFF.
    • Brake indicator illuminates.

Headlamps, Daytime Running Lamps (DRL) On With Park Brake Applied

2

Disengage the parking brake.
    • Headlights illuminate to 80%.
    • Brake warning indicator stops illuminating.
    • Park and Tail Lamps do not illuminate.

Daytime Running Lamps (DRL) Inoperative, Headlamp Switch Operates Normally

3

Cover ambient light sensor.
    • Headlights at full power.
    • Park lamps illuminate.

Headlamps Do Not Switch Intensity