Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions
8 Digit GM Part Number: The scan tool displays the eight digit part number of the control module selected.
Battery Voltage: The scan tool displays 9.0-15.0 volts. The state of the battery voltage supplied to the MSM.
Door Ajar Switches: The scan tool displays Active/Inactive. The vehicle door ajar switches inputs to the BCM, where a closed door ajar switch is displayed as Active.
Door Lock Motor: The scan tool displays On/Off. The door lock actuators output from the BCM, where the actuators transition to the Lock position is displayed as On.
Door Unlock Motor: The scan tool displays On/Off. The door lock actuators output from the BCM, where the actuators transition to the Unlock position is displayed as On.
Door Unlock Switch: The scan tool displays Active/Inactive. The vehicle door lock switches inputs to the BCM, where a switch transition to the Lock position is displayed as Active.
Driver Identification: The scan tool displays Driver 1/Driver 2. The memory select switch input to the MSM to identify the driver selected.
Drivers Door Open Sw.: The scan tool displays Active/Inactive. The driver door ajar switch input to the BCM, where an open door is displayed as Active.
Drivers Door Unlock Motor: The scan tool displays On/Off. The driver door lock actuator output from the BCM, where the actuators transition to the Unlock position is displayed as On.
Key Cylinder Lock Switch: The scan tool displays Active/Inactive. The door lock cylinder switches inputs to the BCM, where a switch transitioning to the Lock position is displayed as Active.
Key Cylinder Unlock: The scan tool displays Active/Inactive. The door lock cylinder switches inputs to the BCM, where a switch transitioning to the Unlock position is displayed as Active.
Left Horizontal Motor: The scan tool displays Right/Left/Off. The driver mirror horizontal motor output from the MSM, where the horizontal motor transitions are displayed as Right and Left.
Left Vertical Motor: The scan tool displays Up/Down/Off. The driver mirror vertical motor output from the MSM, where the vertical motor transitions are displayed as Up and Down.
Lt. Horiz. Mirror Pos: The scan tool displays 0.75-4.50 volts. The driver mirror horizontal position sensor feedback voltage to the MSM.
Lt. Vertical Mirror Pos: The scan tool displays 0.75-4.50 volts. The driver mirror vertical position sensor feedback voltage to the MSM.
Liftgate Lock Motor: The scan tool displays On/Off. The liftgate lock actuators output from the BCM, where the actuators transition to the Lock position is displayed as On.
Liftgate Unlock Motor: The scan tool displays On/Off. The liftgate lock actuators output from the BCM, where the actuators transition to the Unlock position is displayed as On.
Lock/Unlock Switch: The scan tool displays 0.0 -- 25.5 volts. The door lock switches feedback voltage to the BCM.
Memory Switch: The scan tool displays Driver 1/Driver 2/Easy Exit/Inactive. The memory switch input to the MSM, indicating which memory function has been selected.
Memory 1 Left Horizontal Value: The scan tool displays 0.75-4.50 volts. The driver mirror horizontal position sensor feedback voltage to the MSM for memory position 1.
Memory 1 Left Vertical Value: The scan tool displays 0.75-4.50 volts. The driver mirror vertical position sensor feedback voltage to the MSM for memory position 1.
Memory 1 Right Horizontal Value: The scan tool displays 0.75-4.50 volts. The passenger mirror horizontal position sensor feedback voltage to the MSM for memory position 1.
Memory 1 Right Vertical Value: The scan tool displays 0.75-4.50 volts. The passenger mirror vertical position sensor feedback voltage to the MSM for memory position 1.
Memory 2 Left Horizontal Value: The scan tool displays 0.75-4.50 volts. The driver mirror horizontal position sensor feedback voltage to the MSM for memory position 21.
Memory 2 Left Vertical Value: The scan tool displays 0.75-4.50 volts. The driver mirror vertical position sensor feedback voltage to the MSM for memory position 2.
Memory 2 Right Horizontal Value: The scan tool displays 0.75-4.50 volts. The passenger mirror horizontal position sensor feedback voltage to the MSM for memory position 2.
Memory 2 Right Vertical Value: The scan tool displays 0.75-4.50 volts. The passenger mirror vertical position sensor feedback voltage to the MSM for memory position 2.
Mirror Switch State: The scan tool displays Left Right/Left Left/Left Up/Left Down/Right Right/Right Left/Right Up/Right Down/Idle. The mirror switch input to the MSM, indicating which mirror function has been selected.
Passenger Door Open Sw.: The scan tool displays Active/Inactive. The passenger door ajar switch input to the BCM, where an open door is displayed as Active.
PRNDL State: The scan tool displays Park/Reverse/Neutral/Drive/First. The PRNDL input to the MSM displaying gear selection.
Right Horizontal Motor: The scan tool displays Right/Left/Off. The passenger mirror horizontal motor output from the MSM, where the horizontal motor transitions are displayed as Right and Left.
Right Vertical Motor: The scan tool displays Up/Down/Off. The passenger mirror vertical motor output from the MSM, where the vertical motor transitions are displayed as Up and Down.
Rt. Horiz. Mirror Pos.: The scan tool displays 0.75-4.50 volts. The passenger mirror horizontal position sensor feedback voltage to the MSM.
Rt. Vertical Mirror Pos.: The scan tool displays 0.75-4.50 volts. The passenger mirror vertical position sensor feedback voltage to the MSM.
Rear Door Open Sw.: The scan tool displays Active/Inactive. The LR and RR door ajar switches inputs to the BCM, where an open door is displayed as Active.
System Power Mode: The scan tool displays Off Awake/Accessory/Run/Crank. The ignition switch input states to the MSM used for power moding.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.