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Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19452
Experience:  ASE Master Certification. GM World Class Certification
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Daytime running lights on 99 Tahoe dont work but green dash

Resolved Question:

Daytime running lights on 99 Tahoe don't work but green dash indicator light is on.
Submitted: 8 years ago.
Category: Chevy
Expert:  Dave Nova replied 8 years ago.

The daytime running light diode is a common failure on these trucks. It is located under the drivers side of the dash.

The daytime running lamps (DRL) diode consists of a black aluminum case with fins. The diode attaches to the instrument panel (IP) harness behind the left side of the IP.

  1. Ensure that the ignition switch is in the OFF position.
  2. Ensure that the headlamp switch is in the OFF position.
    Object Number: 277249  Size: SH
  3. Remove the bolt that retains the DRL diode from the lower IP reinforcement.
  4. Disconnect the electrical connector.
  5. Remove the DRL diode from the vehicle.
  6. Connect a jumper wire across the terminals of the diode connector, if the daytime running lights work replace the diode.
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