GM Service Manual Online
For 1990-2009 cars only
Ambient Light Sensor: Displays 0 to 255 Counts. The ambient light sensor input signal.

Battery Voltage: Displays 0 to 25.5 volts. The battery voltage level at the module.

Control Power: Displays Off or On. The commanded state of the control power terminal.

Daytime Running Lamp: Displays Off or On. The commanded state of the DRL relay.

Drivers Door Jamb Sw.: Displays ON or OFF. The status of the driver door jamb switch.

Flash to Pass Switch: Displays Off or On. The status of the flash to pass switch.

Fluorescent Light: Displays 0 to 100%. The fluorescent light level of the instrument cluster.

Front Foglamp Relay: Displays Off or On. The commanded state of the front fog lamp relay.

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

Hazard Lamp Switch: Displays Off or On. The status of the hazard lamp switch.

Head Lamp Switch: Displays Off or On. The status of the headlamp switch.

High Beam Output - Flash to Pass: Displays Off or On. The commanded state of the flash to pass control terminal.

Hood Jamb Switch: Displays Off or On. The status of the hood jamb switch.

Incandescent Dim #1: Displays the percentage of dimming sent to the incandescent lamps.

Interior Dim Pot: Displays 0-255 Counts. The interior dimmer switch input signal.

Interior Lamp Input: Displays Off or On. The status of the inadvertent power input.

Interior Lamp Switch: Displays Auto or On. The status of the interior lamp switch.

Interior Lighting Relay: Displays Off or On. The commanded state of the interior lamp relay.

Left Rear Door Jamb Sw.: Displays ON or OFF. Indicates the status of the left rear door jamb switch.

Left Turn Signal: Displays Off or On. The status of the discrete left turn signal. The instrument cluster uses this input to determine when to flash the left turn indicator.

Low/High Beam Output: Displays Off or On. The commanded state of the headlamp control terminal.

Overhead Lamps Output: Displays Off or On. The status of the CTSY LP 1 terminal.

Park Lamp: Displays Off or On. The status of the park lamp switch.

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

Pass. Door Jamb Sw.: Displays ON or OFF. Indicates the status of the passenger door jamb switch.

Position Lamp Relay: Displays Off or On. The commanded state of the standing lamp relay.

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

Right Turn Signal: Displays Off or On. The status of the discrete right turn signal. The instrument cluster uses this input to determine when to flash the right turn indicator.

Rt Rear Door Jamb Sw.: Displays ON or OFF. Indicates the status of the right rear door jamb switch.

Switch Dimming: Displays Active or Inactive. Indicates the status of the appropriate door control module dimming control output.

Trailer Detection Input: Displays Off or On. The status of the trailer detect terminal.

Twilight Delay Pot: Displays 0-255 Counts. The twilight delay switch input signal.

Twilight Photocell: Displays 0-5 volts. The ambient light sensor input signal.

VF Dim: Displays 0-100 percent. The vacuum fluorescent (VF) display dimming level of the instrument cluster.

Lights On With Wipers: Displays Off or On. The status of the wiper switch.