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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 530 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DESCRIPTION AND OPERATIONCHARGING SYSTEM DESCRIPTION AND OPERATIONCHARGE INDICATOR
1999 GMC Forward Control 5.7 R, Automatic

Charge Indicator

1999 GMC Forward Control 5.7 R, AutomaticSECTION Charge Indicator
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel cluster (IPC) illuminates the battery indicator in the message center when the following occurs:

  • The engine control module (ECM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the ECM requesting illumination.
  • The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
  • The ignition is ON, with the engine OFF.

The IPC sends a class 2 message to the radio for audible warning when this indicator is on.

RENDER: 1.0x

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When to See a Mechanic

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.