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.
Vehicle Security Module
The vehicle security module monitors the inputs and provides outputs and diagnostic information for the following systems:
- Autolamps
- RKE system
The vehicle security module also provides the instrument cluster with door ajar information over the universal asynchronous receiver-transmitter (UART) based protocol (UBP) communications network in order for the instrument cluster to close the interior lamps relay, providing power to the interior lamps and the running board lamps (if equipped). If the vehicle is not equipped with a vehicle security module, the door ajar switches are hardwired to the instrument cluster. If equipped, the vehicle security module grounds the horn relay when the panic function is commanded by using the RKE transmitter.
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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.