GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Data Display

Units Displayed

Typical Data Value

Operating Conditions: Ignition in the ON position. Bright Light Applied to the DRL ambient light sensor. Park break not set. Headlamp Switch in the OFF position. IP lamp switch in the OFF position. Fog lamp switch in the OFF position.

Ambient Light Sensor

Data

Volts

2.1

Backup Lamp Relay

Outputs

Inactive/Active

Inactive

Courtesy Ground

Inputs

Present/Not Present

Present

Courtesy Switch

Inputs

ON/OFF

OFF

Door Jamb Switch

Inputs

OPEN/CLOSED

CLOSED

Driver Door Switch

Inputs

OPEN/CLOSED

CLOSED

Front Fog Lamp Relay

Outputs

ON/OFF

OFF

Headlamp Switch

Inputs

Inactive/Active

Inactive

Headlamp

Outputs

ON/OFF

OFF

Inadvert. Power Output

Inputs

ON/OFF

OFF

LCM Lights on Chime

Inputs

ON/OFF

OFF

Left Turn Signal

Outputs

ON/OFF

OFF

Lt. Turning Signal Sw.

Inputs

ON/OFF

OFF

Park Brake Switch

Input

ON/OFF

OFF

Park Lamps

Outputs

ON/OFF

OFF

Right Turn Signal

Outputs

ON/OFF

OFF

Rt. Turning Signal Sw.

Inputs

ON/OFF

OFF

Theater Dimming #1

Outputs

ON/OFF

OFF