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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 378 (LIGHTING SYSTEMS)DESCRIPTION AND OPERATIONEXTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATIONDRIVER CONTROLS AND MODULES
1999 GMC Forward Control 5.7 R, Automatic

Driver Controls and Modules

1999 GMC Forward Control 5.7 R, AutomaticSECTION Driver Controls and Modules
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM) module processes the inputs and the controls. The ambient light sensor supplies the BCM with a signal for daytime conditions or for low light conditions:

  • The Body Control Module (BCM)
  • The ambient light sensor
  • The Instrument Panel Cluster (IPC)

    Driver controls include the following components:

  • The fog lamp switch
  • The door lock switches
  • The headlamp dimmer switch
  • The headlamp switch
  • The park/neutral position switch
  • The park brake indicator switch
  • The stop lamp switch
  • The turn signal switch
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.