mercedes 206 cls500 / keyless

[blaser63]

before i go to garage ( £45 diagnostic ) keyless playing up ! have changed batteries in both keys, but car keeps saying key still in car or key not detected ! will let me in and will lock but won't let me start car, if i press start without foot on brake ignition comes on then foot on brake will start, won't unlock car from boot but will lock from boot !! aarrrghh any help ???

[Shambler]

The sensor in the car is programmed to assess whether or not the key is actually inside the car and not whether it can detect it or not. This is to save you if you happen to drop it on the ground outside or leave it with your wallet on the roof when getting in. When you get this warning it could be because the sensor has detected the key but has judged it to be outside the car. To correct this you need to re-calibrate the sensor - i.e. help it learn the space that is inside the car. A little known trick to do this involves performing the following routine. Firstly hold the key in what you believe to be the center of the cabin and start the engine. Then while the engine is running trace out the border of the cabin with the key. That is hold the key between two fingers and run it around the extremities of the cabin - the roof, floor, footwells, cupholders, etc. Be sure to go everywhere. Then return the key to the center of the cabin and stop the engine. That should do it.

[blaser63]

thanks for quick reply its not early april 1st ! is it ??

[blaser63]

thanks shambler, despite my disbelief tried your advice today ! boot now opens car starts, but still getting message on dash key still in vehicle ! do i take to garage or wait to see if gets better ???