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.
Local Interconnect Network (LIN) Description
The driver door module (DDM) and the front passenger door module (FPDM) communicate with window motors on the local interconnect network bus 1 and the local interconnect network bus 2 circuits respectively. The DDM LIN buss is connected to all window motors on its side of the vehicle, while the FPDM LIN buss is connected to the other window motors. Communication on this network is only between the door modules and the window motors. The window motors are in effect modules. The window motor modules do not communicate on any other data buss; therefore the door modules, which also communicate on the low speed GMLAN serial data buss will perform all communication with each other, the motors, the SCCM (gateway) and the scan tool including setting LIN buss DTCs.
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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.