GM Service Manual Online
For 1990-2009 cars only
Ambient Light Sensor: Displays 0-5 volts. The sunload sensor assembly signal, 0.09-4.80 volts is the normal operating range.

Battery Voltage: Displays 0-20 volts. The voltage as received on the battery positive voltage circuit of the module.

Control Power: Displays On/Off. The state of control power.

Daytime Running Lamp: Displays On/Off. The commanded state of the daytime running lamp relay.

Driver Door Jamb Sw.: Displays On/Off. The state of the drivers door jamb switch. On indicates the door is open and Off indicates the door is closed.

Flash to Pass Switch: Displays On/Off. The state of the flash to pass switch.

Front Fog Lamp Relay: Displays On/Off. The commanded state of the front fog lamp relay.

Front Fog Lamp Switch: Displays On/Off. The state of the front fog lamp switch.

Head Lamp Switch: Displays On/Off. The state of the headlamp switch. On indicates the headlamps are requested on.

High Beam - Flash to Pa: Displays On/Off. The commanded state of the high beam relay.

High Beam Lamp: Displays On/Off. The state of the headlamp high beam switch.

High Beam Switch: Displays On/Off. The state of the headlamp high beam switch.

Inadvertent Power Input: Displays Active/Inactive. The state of the inadvertent power.

Inadvertent Power Relay: Displays On/Off. The commanded state of the inadvertent power relay.

Incandescent Dim 1: Displays 0-100%. The percentage of dimming sent to the incandescent lamps.

Interior Dim Pot: Displays 0-5 volts. The I/P dimmer switch input signal, 0.09-4.80 volts is the normal operating range.

Interior Lamp Switch: Displays On/Door. The state of the interior lamp switch.

Key Cylinder Halo Lamp: Displays On/Off. The commanded state of the key cylinder halo lamp.

Left Rear Door Jamb Sw.: Displays On/Off. The state of the left rear door jamb switch. On indicates the door is open and Off indicates the door is closed.

Lights On With Wipers: Displays On/Off. The state of the wiper/washer system.

Low Beam Output: Displays On/Off. The commanded state of the low beam relay.

Lt. Turning Signal Sw.: Displays On/Off. The state of the left turn signal switch.

Overhead Lamps Output: Displays On/Off. The commanded state of the overhead lamps.

Park Lamp: Displays On/Off. The state of the park lamp switch.

Park Lamp Relay Output: Displays On/Off. The commanded state of the park lamp relay.

Pass. Door Jamb Sw.: Displays On/Off. The state of the right front door jamb switch. On indicates the door is open and Off indicates the door is closed.

Reverse Lamp Relay: Displays On/Off. The commanded state of the reverse lamp relay.

Rt. Rear Door Jamb Sw.: Displays On/Off. The state of the right rear door jamb switch. On indicates the door is open and Off indicates the door is closed.

Rt. Turning Signal Sw.: Displays On/Off. The state of the right turn signal switch.

Twilight Delay Pot: Displays 0-5 volts. The twilight delay switch input signal, 0.09-4.80 volts is the normal operating range.

VF Dim: Displays 0-19 volts. The HUD monitors the VF dimming signal circuit of the HUD switch, 2.0-11.0 volts is the normal operating range.