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

Instrument Cluster (IPC)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Incandescent Dim #1

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The IPC activates the incandescent #1 output for 5 seconds when you select ON. The Instrument Cluster, Driver Information Center, HVAC controls, PRNDL, radio, front and rear ashtray lamps, left and right heated seat switches, left and right steering wheel controls, and rear blower switch should illuminate for 5 seconds

Incandescent Dim #2

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The IPC activates the incandescent #2 output for 5 seconds when you select ON. The headlamp switch assembly, and the left and right window switches should illuminate for 5 seconds.

Body Control Module (BCM)

Scan Tool Output Control

Additional Menu Selection(s)

Description

Daytime Running Lamps

Light Test

The BCM activates the DRL relay for 5 seconds when you select ON. The Daytime Running Lamps should illuminate for 5 seconds.

Exterior Lamps

Light Test

The BCM provides supplied positive voltage to the PARK LAMPS relay coil and the HEADLAMP relay coil when you select ON. The exterior lamps output should be active for 5 seconds.

Front Fog Lamps

Light Test

The BCM activates the FOG LAMP relay for 5 seconds when you select ON. The front fog lamps should illuminate for 5 seconds.

High Beams

Light Test

The BCM activates the HIGH/LOW BEAM HEADLAMP relay for 5 seconds when you select ON, while the low beam headlamps are on. The high beam headlamps should illuminate for 5 seconds.

Inadvertent Power

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The BCM deactivates the INADVERTENT POWER relay when you select OFF. The foot well, IP compartment, rear compartment, vanity mirror, and courtesy lamps should be inoperative.

Interior Lamps

Light Test

The BCM activates the COURTESY relay for 5 seconds when you select ON. The foot well, and courtesy lamps should illuminate for 5 seconds.

Low Beams

Light Test

The BCM activates the HEADLAMP relay for 5 seconds when you select ON, while the Exterior Lamps control is active. The low beam headlamps should illuminate for 5 seconds.

Parking Lamps

Light Test

The BCM activates the PARK LAMPS relay for 5 seconds when you select ON, while the Exterior Lamps control is active. The park lamps should illuminate for 5 seconds.

Reverse Relay

Miscellaneous Test

The BCM activates the REVERSE relay for 5 seconds when you select ON. The backup lamps should illuminate for 5 seconds.