GM Service Manual Online
For 1990-2009 cars only

Use the scan tool in order to cycle the instrument cluster indicators or Messages On or OFF. The gauges can be swept and the PRNDL display positions can be commanded ON. The following tests are available under the Special Functions selection:

Lamp Test

The following indicators or Messages can be commanded ON or OFF.

    • ABS Lamp
    • Air Bag Lamp
    • Brake Lamp
    • Cargo Door Ajar
    • Cargo Lamp ON
    • Change Oil
    • Check Eng Oil Level
    • Check Eng Oil Pressure
    • Check Coolant Temp
    • Cruise Control Lamp
    • Engine Hot
    • Engine Overheated
    • High Beam Lamp
    • Low Fuel
    • Low Washer Fluid
    • Low Coolant
    • Oil Pressure Lamp
    • Overspeed
    • Service 4WD
    • 4WD Indicator
    • Reduce Engine Power
    • Seat Belt Lamp
    • Security
    • Service Ride Control
    • Service Throttle Soon
    • Tow / Haul
    • Trans. Fluid Hot
    • Trans... Hot Idle Engine
    • Upshift Lamp
    • Volts Lamp
    • Water in Fuel

IPC Gauges

The following gauges can be swept:

    • Coolant Gauge Sweep Test
    • Fuel Gauge Sweep Test
    • Speed Gauge Sweep Test
    • Tach Gauge Sweep Test
    • Trans Oil Temp Gauge Sweep Test

PRNDL Display

The following PRNDL displays can be commanded ON:

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