W220 Keyless Remote Not Working

[Muhammad Danish]

I have bought W220, 2001, S500 last week. It have 165k Kilometers on the clock and works perfectly fine beside only one issue. It does not lock or unlock from the key. I have to align the key to the door handle to get it lock/unlock. I got the car scanned but there were no errors displayed. I replaced the FOB batteries as well but it didn't work.!! KEY is perfectly fine as well, Light blinks on every button click. Looking for help.!!

 

[Blobcat]

Hello and welcome

Sounds like the RF part of the key has failed. If it unlocks close to the drivers door then the IR side of the key is working.
There is a coil in the key that can easily become detached after being dropped a few times…

However if you have 2 keys and both don’t work it could be the RF amp in the car that has stopped working

 

[Muhammad Danish]

Hello and welcome

Sounds like the RF part of the key has failed. If it unlocks close to the drivers door then the IR side of the key is working.
There is a coil in the key that can easily become detached after being dropped a few times…

However if you have 2 keys and both don’t work it could be the RF amp in the car that has stopped working

Thanks for your reply, Unfortunately, I only have one key. And I got the key checked in a shop, it's fine. The issue is inside the car.

 

[alexanderfoti]

Then the RF amp is not working properly. How is your radio reception?

 

[Muhammad Danish]

Then the RF amp is not working properly. How is your radio reception?

I have android in my car, haven't checked radio ever. But my car goes silent when I turn the music on high volume. No sound is there, I need to wait for 10 to 15 minutes for the sound to come back. I will check the radio today.

 

[alexanderfoti]

I have android in my car, haven't checked radio ever. But my car goes silent when I turn the music on high volume. No sound is there, I need to wait for 10 to 15 minutes for the sound to come back. I will check the radio today.

The antenna amp gets power from the audio gateway (that you may be missing if you have android headunit installed). May be the source of your issue

 

[Muhammad Danish]

The antenna amp gets power from the audio gateway (that you may be missing if you have android headunit installed). May be the source of your issue

Brother I am new to all this stuff and I really don't know how to figure it out. It will be very helpful if you can provide me with any diagram or something like that so that I can check the connections or something.

 

[mattkh]

Brother I am new to all this stuff and I really don't know how to figure it out. It will be very helpful if you can provide me with any diagram or something like that so that I can check the connections or something.

The signal from your key fob is sent to the aerial fitted onto the roof of your car.
This signal is weak. So part of the aerial gets power from the car battery to improve this signal.
In your case there is no power going to that part of the aerial.

 

[Muhammad Danish]

The signal from your key fob is sent to the aerial fitted onto the roof of your car.
This signal is weak. So part of the aerial gets power from the car battery to improve this signal.
In your case there is no power going to that part of the aerial.

I will get it checked this Friday. As I live in Dubai, & our holiday is on Friday. Will updates soon.