GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

ALC Switch: The scan tool displays On/Off. When the ambient light level indicates low light level then the BCM will turn on the automatic light control (ALC) then the scan tool will display On.

Backup Lamp Relay Cmd.: The scan tool display On/Off. When the transmission is placed in the REVERSE position the scan tool displays On.

Battery Voltage Signal: The scan tool displays Volts. This is the current battery voltage at the BCM.

BPP Sensor: The scan tool displays Volts. The varied voltage from the BPP sensor is displayed on the scan tool.

BPPS Learn Home Position: The scan tool displays Counts. The brake pedal home position is displayed as Counts.

BPPS High During Learn: The scan tool displays No/Yes. If the BPP sensor is shorted high during reprogramming, the scan tool will display Yes.

BPPS Low During Learn: The scan tool displays No/Yes. If the BPP sensor is shorted low during reprogramming, the scan tool will display Yes.

BPPS Move During Learn : The scan tool displays No/Yes. If the BPP sensor is moved during reprogramming, the scan tool will display Yes.

BPP Sensor Reference: The scan tool displays Volts. The 5-volt reference voltage is displayed.

BPPS Status: The scan tool displays Learned/Unlearned. If the BPP sensor is not programmed then the scan tool displays Unlearned.

Day/Night Status: The scan tool displays Off/On. When the daylight conditions are present the scan tool will display Off.

DRL Status: The scan tool displays On/Off. When the ambient light level indicates daylight level then the scan tool will display ON.

Flash to Pass Switch : The scan tool displays Inactive/Active. When Flash to Pass switch is placed in the OFF position, the scan tool displays Inactive.

Fog Lamp Relay Cmd.: The scan tool displays On/Off. When the fog lamps are placed in the ON position then the scan tool displays On.

Front Fog Lamp Switch: The scan tool displays Inactive/Active. When the fog lamp switch is in the OFF position the scan tool displays Off.

Hazard Lamp Switch: The scan tool displays Inactive/Active. When the hazard switch is placed in the ON position, the scan tool will display ON.

Headlamp OFF Switch: The scan tool displays On/Off. When the headlamp switch is placed in the OFF position, the scan tool displays On.

Headlamp ON Switch: The scan tool displays Inactive/Active. When the headlamp switch is placed in the ON position, the scan tool displays Active.

High Beam Relay Command: The scan tool displays On/Off. When the high beam headlamps are turned on, the scan tool displays On.

High Beam Select Switch: The scan tool displays Inactive/Active. When the high beam headlamps are turned on, the scan tool displays Active.

Ign. Mode Sw. Dimming Command: The scan tool displays On/Off. When the ignition switch dimming is commanded on, the scan tool displays On.

Inadvertent Power Cmd.: The scan tool displays On/Off. When the inadvertent power is being commanded on by the BCM the scan tool displays On.

Inadvertent Power Signal: The scan tool displays Inactive/Active. When the inadvertent power is being commanded on by the BCM the scan tool displays Active.

Learn in Progress: The scan tool displays No/Yes. When the BPP Sensor is being reprogrammed, the scan tool displays Yes.

Left Turn Signal Switch: The scan tool displays Inactive/Active. When the turn signal switch is placed in the LEFT position, the scan tool will display Active.

LF Turn/Hazard Lamp Command: The scan tool displays On/Off. When the turn signal is place in the LEFT position, the scan tool displays On.

LF Turn Lamp/DRL Status: The scan tool displays On/Off. When the DRL lamps are commanded on by the BCM or the turn signal switch is placed in the LEFT position, scan tool displays On.

Low Beam Relay Command: The scan tool displays On/Off. When the headlamp are turned on, the scan tool displays On.

LR Turn/Hazard Lamp Command: The scan tool displays On/Off. When the turn signal is place in the LEFT position, the scan tool displays On.

LR Turn Lamp/DRL Status: The scan tool displays On/Off. When the DRL lamps are commanded on by the BCM or the turn signal switch is placed in the LEFT position, scan tool displays On.

Park Lamp Relay Cmd.: The scan tool displays On/Off. When the park lamps are turned on, the scan tool will display On.

Park Lamp Switch: The scan tool displays On/Off. When the park lamp switch is placed in the ON position, the scan tool will display On.

Rear Fog Lamp Relay Cmd.: The scan tool displays On/Off. When the rear fog lamps are placed in the ON position then the scan tool displays On.

Rear Fog lamp Switch: The scan tool displays inactive/active. When the rear fog lamp switch is in the OFF position the scan tool displays Off.

RF Turn/Hazard Lamp Command: The scan tool displays On/Off. When the turn signal is place in the RIGHT position, the scan tool displays On.

RF Turn Lamp/DRL Status: The scan tool displays On/Off. When the DRL lamps are commanded on by the BCM or the turn signal switch is placed in the RIGHT position, scan tool displays On.

Right Turn Signal Switch: The scan tool displays Inactive/Active. When the turn signal switch is placed in the RIGHT position, the scan tool will display Active.

RR Turn/Hazard Lamp Command: The scan tool displays On/Off. When the turn signal is place in the RIGHT position, the scan tool displays On.

RR Turn Lamp/DRL Status: The scan tool displays On/Off. When the DRL lamps are commanded on by the BCM or the turn signal switch is placed in the RIGHT position, scan tool displays On.

Stop Lamp Relay Command: The scan tool displays On/Off. When the brakes are applied, the scan tool displays On.

Stop Lamp Status : The scan tool displays On/Off. When the stop lamps are applied, the scan tool displays On.

Theater Dimming Command: The scan tool displays On/Off. When the theater dimming is commanded on by the BCM, the scan tool displays On.

Driver Door Module (DDM)

Door Switch Backlight Command: The scan tool displays a percentage of intensity. When the dimmer switch is full bright the scan tool will display 100 percent.

Lock Switch Indicator Command: The scan tool displays On/Off. When the door lock is activated to the lock or unlock position, the DDM commands the door lock switch indicator on.

HVAC

Left Sunload Sensor: The scan tool displays Counts. When the ambient light level increases or decreases, the scan tool display will change the counts displayed.

Right Sunload Sensor: The scan tool displays Counts. When the ambient light level increases or decreases, the scan tool display will change the counts displayed.

Instrument Panel Cluster (IPC)

Dim Down Switch: The scan tool displays Inactive/Active. When the dimmer switch is commanding The interior lamps dim down, the scan tool displays Active.

Dim Up Switch: The scan tool displays Inactive/Active. When the dimmer switch is commanding The interior lamps dim up, the scan tool displays Active.

Dome Lamp Switch: The scan tool displays On/Off. When the dome lamps are commanded on, the scan tool displays On.

Front Fog Indicator Command: The scan tool displays On/Off. When the front fog lamp indicator is commanded on, the scan tool displays On.

Headlamps On Indicator: The scan tool displays Off/On. When the headlamps are On the scan tool displays On.

High Beam Indicator Command: The scan tool displays On/Off. When the high beam indicator is commanded on the scan tool displays On.

Left Turn Signal: The scan tool displays On/Off. When the left turn lamps are commanded on, the scan tool displays On.

Park Lamps Signal: The scan tool displays On/Off. When the park lamps are commanded on, the scan tool displays On.

Rear Fog Indicator Command: The scan tool displays On/Off. When the rear fog lamp indicator is commanded on, the scan tool displays On.

Right Turn Signal: The scan tool displays On/Off. When the right turn lamps are commanded on, the scan tool displays On.

Passenger Door Module (PDM)

Door Switch Backlight Command: The scan tool displays a percentage of intensity. When the dimmer switch is full bright the scan tool will display 100 percent.

Lock Switch Indicator Command: The scan tool displays On/Off. When the door lock is activated to the lock or unlock position, the DDM commands the door lock switch indicator on.