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.
Module, Vehicle System Interface (VSIM): Description
Vehicles manufactured with a fleet equipment package are equipped with a Vehicle System Interface Module (VSIM) (1). The VSIM has many hard-wired inputs and outputs through the VSIM jumper harnesses. It also has Controller Area Network (CAN) communication bus output signals. The VSIM allows the upfitter to turn on certain features or functions with hard-wired or bussed commands. It also a outputs signals and relay driver control circuits based on the vehicle information. The VSIM on this is vehicle is installed behind the instrument panel cup holder.
A VSIM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced.
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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.