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 brake not set. Headlamp Switch in the OFF position. I/P lamp switch in the OFF position. Fog lamp switch in the OFF position.

Ambient Light Sensor

Exterior Lighting

Volts

Volts

Ambient Light States

Exterior Lighting

Night/Day

Unknown/Invalid

 

Auto Hdlp. Disable Sw.

Exterior Lighting

Inactive/Active

 

Backup Lamps

Exterior Lighting

On/Off

Off

Bass High During Learn

Bass Data

No/Yes

No

Bass Learned

Bass Data

No/Yes

Yes

Bass Low During Learn

Bass Data

No/Yes

No

Bass Moved During Learn

Bass Data

No/Yes

No

Bass Valid

Bass Data

No/Yes

Yes

Brake Applied Output Signal

Outputs

On/Off

Off

Brake Apply Sensor

BCM Data

Volts

0 volts

Brake Lamp

Bass Data

On/Off

Off

Center Stop Lamp

Exterior Lighting

On/Off

 

Courtesy Lamp PWM Command

Interior Lighting

%

%

Courtesy Lamp Active Reason

Interior Lighting

On/Off

Off

Current Position

Bass Data

Counts

0

Dimming Control Reference

Interior Lighting

Volts

Volts

Dimming Control Signal

Interior Lighting

%

%

Dimming Control Signal

Interior Lighting

Volts

Volts

Flash to Pass Switch

Exterior Lighting

Inactive/Active

Inactive

Front Fog Lamp Relay

Outputs

On/Off

Off

Front Fog Lamp Relay Command

Exterior Lighting

On/Off

Off

Front Fog Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

Hazard Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

Headlamp Switch

Exterior Lighting

Inactive/Active

Inactive

High Beam Select Switch

Exterior Lighting

Inactive/Active

Inactive

Incandescent Dimming

Interior Lighting

%

%

Instrumentation Backlight

Outputs

On/Off

Off

Interior Lamp Output

Outputs

On/Off

Off

Interior Light Switch

Inputs

On/Off

Off

Interior Lights Power

Outputs

On/Off

Off

Interior Lights Power

Inputs

On/Off

Off

Learned Home Position

Bass Data

Counts

0

Learn in Progress

Bass Data

No/Yes

No

LED Dimming PWM Command

Interior Lighting

%

%

Left Turn Signal Switch

Exterior Lighting

Inactive/Active

Inactive

LF Turn Signal

Exterior Lighting

On/Off

Off

Low Beam Relay Command

Exterior Lighting

Inactive/Active

Inactive

Low Beam Switch

Inputs

On/Off

Off

LR Door Open Switch

Inputs

On/Off

Off

LR Turn Signal

Exterior Lighting

On/Off

Off

Park Brake Switch

Inputs

Applied/Released

Released

Park Lamp Relay Command

Exterior Lighting

On/Off

Off

Park Lamp Switch

Exterior Lighting

Inactive/Active

Inactive

Park Lamp Switch

Inputs

On/Off

Off

RF Door Lock Switch

Inputs

On/Off

Off

RF Turn Signal

Exterior Lighting

On/Off

Off

Right Corner Lamp

Exterior Lighting

Inactive/Active

Inactive

Right Turn Signal Switch

Exterior Lighting

On/Off

Off

RR Door Open Switch

Inputs

On/Off

Off

RR Turn Signal

Outputs

On/Off

Off

Stop Lamp Signal

Cruise Control Data

On/Off

Off