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.
Principles of Operation
The driver door module (DDM) monitors all of the hardwired door ajar switches. This door ajar information is provided to the instrument cluster (IC) using the standard corporate protocol (SCP) network. The IC acts as a gateway to translate the information and sends it to the vehicle dynamics module (VDM) using the high speed controller area network (HS-CAN). Diagnostic information is also retrieved from the DDM on the SCP network.
The power door locks, power mirrors and the remote keyless entry (RKE) system are all controlled by the DDM. If equipped with memory seats, the seat adjust switch provides inputs to the DDM, which sends this information to the driver seat module (DSM) over the SCP network.
If the vehicle is not equipped with a power luggage compartment lid, the DDM receives an input from the luggage compartment lid release switch and operates the luggage compartment lid release solenoid. If the vehicle is equipped with a power luggage compartment lid, the DDM sends a signal to the liftgate/trunk module (LTM), which will operate the luggage compartment lid release solenoid. The DDM also contains the tire pressure monitoring system (TPMS).
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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.