GM Service Manual Online
For 1990-2009 cars only
Battery Voltage Signal: The scan tool displays 9.0-16.0 Volts. The state of the battery voltage feed to the door control modules or door switch selected.

Mirror 5 Volt Reference: The scan tool displays voltage for the 5 volt reference circuit.

Mirror Motor: The scan tool displays Idle/Left/Right/Up/Down/Invalid. The driver mirror motors outputs from the DDM, where the mirror motors transitions are displayed as Up, Down, Left, Right. The scan tool is capable of commanding the driver mirror motors to all positions.

Mirror Horizontal Position: The scan tool displays 0.5-4.50 Volts. The driver mirror horizontal motor output from the DDM, where the mirror motor movement is measured in Volts.

Mirror Vertical Position: The scan tool displays 0.5-4.50 Volts. The driver mirror vertical motor output from the DDM, where the mirror motor movement is measured in Volts.

Mirror Direction Switch: The scan tool displays Idle/Up/Down/Left/Right/Left Up/Left Down/Right Up/Right Down. The mirror switch input to the DDM, where the mirror switch transitions are displayed as Up, Down, Left, Right, Left Up, Left Down, Right Up or Right Down.

Mirror Fold Switch: The scan tool displays Idle/Extend/Retract. The mirror fold switch input to the DDM, where the mirror fold switch transition is displayed as Extend or Retract.

Mirror Select Switch: The scan tool displays Idle/Left/Right. The mirror select switch input to the DDM, where the mirror select switch transition is displayed as Left or Right.