Central locking not working, but the car drives

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OPO

New Member
Joined
May 28, 2020
Messages
14
Location
South London
Car
CLS350
Just found out that my fob does not lock or unlock the car does. However it drives the car. I have changed the batteries. So I need to sort this out asap. Has anyone encountered this problem?
CLS 350, 2005 model.
 
Possible failure of the amp/antenna in the car.
How do you lock and unlock the car now?
Quickest way to sort it is get the codes read
 
Called out the AA yesterday to unlock the car so that I can drive it to a garage. But they can only book me in next week Friday. Whitenemesis Where would I see the code to read please?
 
Have you tried a spare key
All the 3 keys have the same problem. They can all drive the car but not open or lock the doors. And I have changed the batteries too
 
Called out the AA yesterday to unlock the car so that I can drive it to a garage. But they can only book me in next week Friday. Whitenemesis Where would I see the code to read please?
You need something like STAR, the MB diagnostic tool. Best let an experienced independent specialist check it for you
 
Does the locking work from the switch inside the car
Yes the locking / unlocking switches inside the car work.
Not sure if it is related but the radio stations seem to have scrambled themselves too. can't get most of the stations i use to get before.
 
Have you tried disconnecting the battery for a few minutes.
 
when the AA opened car, did they run full test on Main Battery ?

My car did some odd things when battery was on way out all went away when new battery fitted RAC checked mine and for codes in system and replaced it for free

Tezz
 
when the AA opened car, did they run full test on Main Battery ?

My car did some odd things when battery was on way out all went away when new battery fitted RAC checked mine and for codes in system and replaced it for free

Tezz
The A A guy was very helpful when he attended. Did the main battery check also and confirmed that the battery was still working alright.
 
If the radio is only picking up strong station signals, that points to some sort of aerial problem. Keep driving the car as it is, with fingers crossed if you like, until you can get a proper diagnosis done by an Indie with a STAR. Anything else is just guesswork. You might hit lucky, but probably not.

I don't know whether it applies to your car, but on most MB cars of that age you can centrally lock the car by locking it with the interior switch with the driver's door open, then locking the driver's door with the iron key in the key fob.
 
Hi,
Have you tried the key fob to unlock/lock the car in very close proximity to the door handle/lock? as the CLS utilities both RF and IR to unlock the vehicle (RF for distance, IR for close proximity).
Normally a failure of the distance unlocking/locking is an indication that the RF amplifier has failed, which as it is used in most Mercedes as the radio aerial amplifier as well would make sense from the symptoms you are experiencing.
 
Hi,
Have you tried the key fob to unlock/lock the car in very close proximity to the door handle/lock? as the CLS utilities both RF and IR to unlock the vehicle (RF for distance, IR for close proximity).
Normally a failure of the distance unlocking/locking is an indication that the RF amplifier has failed, which as it is used in most Mercedes as the radio aerial amplifier as well would make sense from the symptoms you are experiencing.
Yes done that. Getting as close as possible to the driver's door. Also checked the fuses. They are all working. Been driving it. Will just wait till next Friday and see what they find out.
Thanks a lot everyone for your assistance.
 
Yes done that. Getting as close as possible to the driver's door. Also checked the fuses. They are all working. Been driving it. Will just wait till next Friday and see what they find out.
Thanks a lot everyone for your assistance.
Hey bud am experiencing the same problem with my Cls checked everything as you all seems fine and locks from inside.

What did you do to fix this issue can you advise please.
 

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