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.
Pre-Drive Check
When KL R is switched on, a self-diagnosis of the overall systems is carried out. During this period the system cannot be triggered.
This is indicated by activation of the airbag warning lamp AWL. The total duration of a fault-free pre-drive check is less than five seconds.
The pre-drive check is divided into two phases.
The pre-drive check only starts when the SIM has received the first control unit status messages from all of the satellites known by coding and no fault has been communicated.
If the status message of a module is not received or if a fault has been communicated, the power supply of the satellite module is switched off.
Use the Manual With the Right Hardware
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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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