Do I Need to Replace the Key Fob?
Thread Starter
Junior Member
Joined: Aug 2017
Posts: 26
Likes: 2
E320
Do I Need to Replace the Key Fob?
2003 Mercedes E320 4Matic sedan. Had been working fine, but the battery died. After replacing it, it worked fine for a day or so, but had to replace a sensor because it wasn't starting properly. The fob stopped working as well.
Changed the fob batteries, but the doors won't unlock. Don't see the LED circle lighting up, but then again, perhaps it never did. So basically I have to unlock the door with the blade key, but the fob works in the ignition turning on.
Is the fob salvageable? I know it's old, but it's odd that it died right after the battery was replaced. Is it possible it needs to be merely programmed to unlock the car, etc? Or do I have to take it to the dealership and pay $200 for a new fob?
Thanks for any advice out there.
Changed the fob batteries, but the doors won't unlock. Don't see the LED circle lighting up, but then again, perhaps it never did. So basically I have to unlock the door with the blade key, but the fob works in the ignition turning on.
Is the fob salvageable? I know it's old, but it's odd that it died right after the battery was replaced. Is it possible it needs to be merely programmed to unlock the car, etc? Or do I have to take it to the dealership and pay $200 for a new fob?
Thanks for any advice out there.
Super Member
Joined: Nov 2018
Posts: 510
Likes: 64
From: Dallas Texas USA
2023 AMG EQE 53
There's a sequence to re-sync the fob to the car. Put a new battery in the fob just to be sure and then re-sync with the car. Owner's manual tells you how it pay the dealer. A new fob is around $600 unfortunately but I doubt that's the problem.
Super Member
Joined: Nov 2018
Posts: 510
Likes: 64
From: Dallas Texas USA
2023 AMG EQE 53
You don't have to go to the dealer. The manual should clearly outline the procedure, I just don't remember it now and it varies if the car had keyless go or not. Follow instructions and you should be OK.
Member
Joined: Dec 2017
Posts: 230
Likes: 38
From: NYC
2008 S550 4Matic, 2007 GL450, 2008 C300, 2018 GLE63 AMG
if fob starts the car then it should open door, if not the fob shell is bad, the batteries not connecting properly.... happens especially on the old black fobs...... make sure the battery pins bent far enough to reach the PCB board in the remote shell.... the red light suppose to blink.... also make sure the batteries inserted properly....
