GM Service Manual Online
For 1990-2009 cars only

Use the scan tool in order to cycle the instrument cluster indicators, the gauges, and the PRNDL display functions. The following tests are available under the Special Functions selection:

Lamp Test

The following indicators can be commanded ON or OFF.

    • Volts Lamp
    • Low Fuel
    • ABS Lamp
    • Brake Lamp
    • Security Lamp
    • Seat Belt Lamp
    • High Beam Lamp
    • Upshift Lamp
    • Overspeed Lamp (Export)
    • Service 4WD Lamp
    • Tow / Haul
    • Gate Ajar Lamp
    • Air Bag Lamp

IPC Gauges

The following gauges can be swept:

    • Coolant Gauge Sweep Test
    • Fuel Gauge Sweep Test
    • Speed Gauge Sweep Test
    • Tach Gauge Sweep Test

PRNDL Display

The following PRNDL displays can be commanded ON:

    • Park
    • Reverse
    • Neutral
    • Drive
    • 3rd
    • 2nd
    • 1st