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.
Control Units: Sim
Located on the transmission tunnel behind the handbrake assembly, the Safety and Information Module (SIM) performs the following functions:
- Supplies voltage to the satellites and the pressure sensors (SBSL,SBSR and STVL,STVR) and supplies the voltage reserve for component activation.
- Bus Master functions for the optical bus communication system (byteflight ).
- Gateway functions between byteflight and K-bus.
- Triggers Emergency Call System (If Phone equipped)
- Signals the DME for deactivation of fuel pump.
- Signals the GM to switch on interior lights, hazard warnings and unlock the doors.
- Monitors the integrated acceleration sensors.
- Allows airbag activation.
- Allows BST activation.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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