GM Service Manual Online
For 1990-2009 cars only

Scan Tool Parameter

Units Displayed

Typical Data Value

Ignition On, Engine Off

DRL Relay

On/Off

Off

DRL Relay Feedback

Active/Inactive

Inactive

Park Lamp Input

On/Off

Off

Low Beam Feedback

Volts

Battery Positive Voltage

High Beam Feedback

Volts

Battery Positive Voltage

Interior Dim Pot

Volts

0.00 Volts

Interior Lamp Output

On/Off

Off

Driver Door Ajar Switch

On/Off

Off

Passenger Door Ajar Switch

On/Off

Off

Inadvert. Power Output

On/Off

On

Inadvert. Power Feedback

Active/Inactive

Active

Cargo Lamp On

On/Off

Off