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 vehicle security module is on the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network. To support several vehicle subsystems, the vehicle security module permits intermodule and diagnostic tool communications.
The vehicle security module controls the power door lock system. The vehicle security module monitors the door lock/unlock switch inputs from the interior door lock switches. When the vehicle security module receives an unlock/lock command from any door lock control switch, the vehicle security module will activate the door lock actuators.
For additional information on the door lock systems, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS .
The vehicle security module controls the autolamp subsystem. The autolamp subsystem provides light-sensitive automatic on/off control of the headlamps and parking lamps. For additional information, refer to EXTERIOR LIGHTING .
NO RELATED
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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.