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.
ID Transmitter
The ID transmitter for Comfort Access must be actuated by means of a radio signal. The ID transmitter is therefore equipped with a receiver for the coded 125 kHz radio signal that is transmitted by the Comfort Access antennas. The radio signal wakes the ID transmitter. The ID transmitter registers with the vehicle automatically (authentication).
For this purpose, the ID transmitter emits a coded 315 MHz high-frequency signal to enable identification of the ID transmitter as being valid and belonging to the vehicle.
The ID transmitter is exclusively responsible for use of the Comfort Access system. The ID transmitter has a battery, the service life of the battery in the ID transmitter is about 4 years.
NO RELATED
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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.