GM Service Manual Online
For 1990-2009 cars only
Table 1: Instrument Panel Cluster (IPC)
Table 2: Instrument Panel Cluster Control Module Output Control

Instrument Panel Cluster (IPC)

Scan Tool Parameter

System State

Expected Value

Definition

Operating Conditions: Ignition ON/Engine OFF/Seat Belt Buckled/High Beams Off/Park Brake Unapplied

Battery Voltage

__

12.2 V

(Varies)

The scan tool displays 0-19 volts. The voltage measured at the battery positive voltage circuit of the instrument panel cluster (IPC).

Engine Coolant Temperature

__

Varies

The scan tool displays 38°C-128°C (100°F-260°F). The displayed coolant temperature gage value in the IPC. This value may slightly differ from the monitored coolant temperature.

Engine Speed

__

0 RPM

The scan tool displays 0-9999 RPM. The IPC monitors the engine speed signal circuit from the PCM.

Fuel Level

__

Varies

The scan tool displays 0-100%. The IPC calculates the amount of fuel remaining in the tank based on the input from the PCM.

PRNDL State

__

Varies

The scan tool displays Manual, Low, 2nd, 3rd, Drive, Neutral, Reverse, Park. The state of the PRNDL as commanded by the IPC.

Trip Odometer

__

Varies

The scan tool displays miles. The IPC calculates trip odometer information from the vehicle speed data received from the PCM.

Trip Odometer

__

Varies

The scan tool displays miles. The IPC calculates trip odometer information from the vehicle speed data received from the PCM.

Trip Reset Switch

__

Inactive

The scan tool displays Active or Inactive. The IPC monitors the control stem on the cluster. A closed switch is displayed as Active.

Vehicle Speed

__

0 mph (0 km/h)

The scan tool displays 0-255 km/h (0-155 mph). The IPC monitors the vehicle speed signal circuit from the PCM


Instrument Panel Cluster Control Module Output Control

Scan Tool Output Control

Description

Lamp Test

The IPC illuminates the following indicators when you select On:

    • ABS
    • Air Bag
    • Brake
    • CRUISE
    • Fasten safety belt
    • High beam
    • SECURITY
    • Upshift - The indicators should illuminate until commanded Off.

IPC Gages

The IPC drives all gages to the maximum physical position when you select On. The IPC drives all gages to the minimum physical position when you select Off.

PRNDL Display

An underscore illuminates under each indicator in the PRNDL display until commanded Off.