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Comfort access menu not showing11/18/2023 At the same time, the outside door handle electronics send a message to the CAS control unit via the.(The car tells the door handle antennas to emit a signal that the key fobs can detect if they are within roughly 1.5m) Operating range of the aerials in the outside door handle. The search determines whether an ID transmitter associated with the vehicle is located in the Included in the search (low-frequency radio signal at 125 kHz). All ID transmitters associated with the vehicle and located outside of it are Request sent to outside door handle electronics to locate an ID transmitter via the aerials in the.(Basically the door handle senses you touching it) Trigger signal at outside door handle electronics via capacitive sensor 1.When you enter the car, if it detects a key fob in the interior it should illuminate the start button on the dash (I'm not sure if it requires the fob to emit a signal to the car in order to illuminate the light, but presumably it does).Ĭlick to expand.In the attached file the process is generally listed under "Authenticity check using the example of Passive Entry" near the end f page 4 and into page 5. When you hit the start button to start the car it does a similar thing where an antenna in the center console tells a registered fob inside the car to send a signal and it starts, if no fob is detected then nothing happens. If a registered fob is within that distance it tells the fob to emit its regular unlock signal (as if you were pressing the unlock button on it). Basically when you touch your door handles the antenna in the handle sends a small signal that only goes about a meter. ![]() Here a video on youtube with someone showing how to reinitialize a comfort access key, however, you've already been starting your car by inserting the key so this likely doesn't apply. It's worth verifying if your battery is in any good but you did mention that the problem persists when you replace it. We have replaceable CR 2032 or 2016 (can't remember which) batteries. If you have comfort access you do not have a key that charges when inserted into the key slot, that is only for non-comfort access. Is it a sedan or wagon? The wagons frequently have their antenna amplifiers fail. Yeah, we need to figure out if the antenna is receiving anything from the key.
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