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
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The scan tool displays the GM part number of the RDM.
- Battery Voltage Signal 1
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The scan tool displays 9.0-15.0 volts. The state of the battery voltage supplied to the roof door module (RDM).
- Battery Voltage Signal 2
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The scan tool displays 9.0-15.0 volts. The state of the battery voltage supplied to the RDM.
- Driver Door Ajar Switch
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The scan tool displays the state of the driver door. Active is open and inactive is closed.
- Driver Door Handle
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The scan toll displays the current state of the door handle switch. When the driver door handle is lifted the scan tool will display active and at rest will display inactive.
- Driver Door Latch Lock Switch
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The scan tool will display Yes if the driver door is locked and No if it is unlocked.
- Driver Window Indexed
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The scan tool displays Yes/No. The position of the window as it indexes downward as a door is opening or as the power top starts it's operation. The window in the indexed position is displayed as Yes.
- Driver Window Motor
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The scan tool will display the current draw, in amps, that the window motor is using.
- Driver Window Motor Command
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The scan tool will display the commanded state of the RDM for window operation
- Driver Window Position
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The scan tool displays the current position of the window in counts.
- Driver Window Switch
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The scan tool will display the current state of the driver window switch.
- Driver Window Top Position
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The scan tool will display Learned if the RDM has Learned the top position and Unlearned if it is unknown.
- Ignition On
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The scan tool displays Yes/No. The state of the ignition, if present would display Yes.
- Ignition Voltage Signal
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The scan tool displays Volts. The state of the ignition voltage signal feed to the RDM.
- Julian Date of Build
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The scan tool displays the date the RDM was built.
- Passenger Door Ajar Switch
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The scan tool displays the state of the passenger door. Active is open and inactive is closed.
- Passenger Door Handle
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The scan toll displays the current state of the door handle switch. When the passenger door handle is lifted the scan tool will display active and at rest will display inactive.
- Passenger Door Latch Lock Switch
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The scan tool will display Yes if the passenger door is locked and No if it is unlocked.
- Passenger Window Indexed
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The scan tool displays Yes/No. The position of the window as it indexes downward as a door is opening or as the power top starts it's operation. The window in the indexed position is displayed as Yes.
- Passenger Window Motor
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The scan tool will display the current draw, in amps, that the window motor is using.
- Passenger Window Motor Command
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The scan tool will display the commanded state of the RDM for window operation
- Passenger Window Position
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The scan tool displays the current position of the window in counts.
- Passenger Window Switch
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The scan tool will display the current state of the passenger window switch.
- Passenger Window Top Position
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The scan tool will display Learned if the RDM has Learned the top position and Unlearned if it is unknown.
- Software Part Number
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The scan tool displays the RDMs software revision part number.
- Year Module Build
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The scan tool displays the year the BCM was built.
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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.