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.
Crash Signal
In the event of a crash involving deployment of the restraint systems, the MRS4RD control unit sends a crash signal to the members of the bus network.
On receipt of that signal, the control units concerned perform the following functions according to the severity of the crash:
- Switch off electric fuel pump
- Switch off alternator
- Unlock central locking system
- Switch on hazard warning flashers
- Make emergency call (only if Professional phone option fitted)
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.