S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Key fob not working correctly

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Old 09-30-2016, 12:29 AM
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03 S500
Key fob not working correctly

Hello i need help with my key fob. It stopped unlocked/locking the doors of the car and won't open the trunk. I changed put the batteries and it still isn't working. However it does work when I'm really close to the vehicles door. How can I fix this?
Old 09-30-2016, 07:32 AM
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1999 E300TD
If the batteries were really new, then you personally won't be able to fix the fault without
some good diagnostic tools that interrogate the very complicated central locking system.

Find an indy with some good tools!!
Old 10-01-2016, 11:22 AM
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1922 Ford Model T / no OBD
Typical failure on knobs is that the coil breaks off the solder and only infra-red sender works on very close range.
Check youtube for videos if you are handy with soldering iron. Other than that it is new key time
https://www.youtube.com/results?sear...des+key+repair
Old 10-03-2016, 01:04 AM
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03 S500
The second key that I have doesn't unlock/lock the doors either so would it still be the key fob that is not working? sometimes the key fob will work on the passenger side of the car tho

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