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Home >> GMC >> 1996 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Gasoline >> Testing >> Daytime Running Lights (DRL) >> Off

Daytime Running Lights (DRL): Off

  1. Disconnect headlamp dimmer switch connector. If high beam headlamps turn off, go to next step. If high beam headlamps do not turn off, service/repair short to voltage in Light Green wire between headlamp dimmer switch and left/right high beam headlamp.
  2. Reconnect headlamp dimmer switch connector. Disconnect headlamp and panel dimmer switch connector. If high beam headlamps turn off, replace headlamp and panel dimmer switch. If high beam headlamps remain on, service/repair short to voltage in Yellow wire between headlamp and panel dimmer switch and headlamp dimmer switch.