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View Full Version : Dead key fob?


Sulaco
03-18-2012, 06:02 PM
OK gents.

My key fob on my 99 c43 started acting weird. It would sometimes stick in the ignition but not turn in the tumbler. I'd pull it out and put it back in once or twice and it'd work. Sometimes the remote lock feature wouldn't work until I was kinda close. Low battery, right?

Replaced both batteries and it was good as new for a couple hours. Then, it wouldn't do anything. No door lock or unlock, won't turn in the ignition either. The valet key works just fine. Am I dealing with a dead key fob or something else?
W202FTW
03-24-2012, 06:01 PM
Sounds like a goofed up infrared sensor in the tumbler. Are you using a key-FOB with the newer style remote?
Sulaco
03-25-2012, 06:08 AM
I would agree, if it still locked/unlocked the doors, but it doesnt. Yep, its the newer smartkey design.
W202FTW
03-25-2012, 09:01 AM
I'd have to guess that the newer smartkeys don't function as well as the OEM keys. I have a buddy who had Mercedes cut and key pro two of the new keys for his 98' C43 AMG and they only work every now and then.
huntsvegas202
04-07-2012, 07:07 PM
I'm having a problem with my key also my infrared doesn't work I pushed tee button and ghe light turns red on my key but it doesnt on my mirror so my doors doesnt unlock
Sulaco
04-07-2012, 07:41 PM
huntsvegas, does your key still turn in the ignition to start the car?
huntsvegas202
04-08-2012, 05:59 AM
huntsvegas, does your key still turn in the ignition to start the car?

Yes but I hve to put key in pass door or trunk to lock and unlock sux too
W202FTW
04-08-2012, 02:58 PM
I'm having a problem with my key also my infrared doesn't work I pushed tee button and ghe light turns red on my key but it doesnt on my mirror so my doors doesnt unlock

Do you have a pre-face alarm system?
huntsvegas202
04-09-2012, 04:31 PM
I think so not sure
hvmercy
04-09-2012, 04:38 PM
What is "pre-face"?

Do you have a pre-face alarm system?
huntsvegas202
04-09-2012, 05:19 PM
Imma noob still so im still learnin the terms myself
W202FTW
04-12-2012, 05:43 PM
A preface alarm system ( Mercedes Designation: ATA ) on the W202 will come with a "flip-key remote," with the car's infrared sensor located on the rear view mirror. The infrared sensor with be marked with a green and red light.

The facelifted ATA system will feature the new style key, with the in fared sensors now located on the driver's side and passenger door handles.