Question about Mercedes-Benz Cars & Trucks
Have a second fob that doesn't set of alarm, but recently dropped in water. Now not able to lock car. Dealer wants $380 for new fob...
The issue is probably due to damaged contacts on the membrane keypad or damaged tact switches within the fob. If you're comfortable doing so, open the fob to gain access to the switches or contacts. If it's a membrane style button then carefully clean the contacts on the circuit board with something like isopropyl alcohol or electrical parts cleaner. If using electrical parts cleaner, be careful not to get it on the plastic as it will likely soften, warp, and / or discolor the plastic. You're better off to spray on a cotton swab and clean the board with the swab.
If your fob uses tact switches, then you may opt to remove the switch from the board which will disable the panic feature. Or, if you have given up hope on the second fob, pull the switch from it and install that one on the otherwise working fob.
Posted on Dec 27, 2018
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Posted on Jan 02, 2017
SOURCE: key fob will not undo
If you don't have one that works for the vehicle now, you'll have to take it to your local dealer to have it programmed to the vehicle. Some will charge for this, some will do it at no charge.
If you do have a remote that is programmed and working for the vehicle, then the following steps will allow you to program another remote:
1. Enter vehicle and close all doors.
2. Put seatbelt on (or clip it into the buckle) to shut the warning buzzer off.
3. Put key in ignition, turn to run position but don't start it.
4. Press and hold the unlock button on the working key fob and hold for 4 seconds, then also press the panic button.
5. Release both buttons and you should hear a single chime to indicate it is in program mode. You have 30 seconds after the chime to program any additional remotes you want to program.
6. Press and release both the unlock and lock buttons simultaneously on the remote you are programming. You should hear another single chime.
7. Within 4 seconds after hearing the chime, press either lock or unlock button on remote that you are programming.
Posted on Oct 16, 2008
The fuse is No.3 "DR locks" (near steering wheel)
If you take the fuse out the doors will not open itselves.
The root cause of the problem will be a microswitch inside the drivers door?
Posted on May 29, 2009
SOURCE: e320 car key doesn't work
I had the same problem with my 2001 E320. Roadside assistance came to my house and said it was a problem with the key. Ordered a new key (cost about $220 from Keys European in Van Nuys, CA) and the key worked. When I went to dealer to pick up the key, I spoke to a service consultant and he said that hes seen that problem before and replacing the key wont do anything (even though it did work). He said something about a ESI (something like that) and said that parts only on that cost about $600. So first thing you should try is replacing your key. Hope I helped.
Posted on Nov 01, 2009
Turn ignition switch to position II. Turn ignition switch to position 0 and remove key. Within 1 minute: Press and hold key lock button. Press unlock button 5 times. Remote control should now operate system. If not: Repeat procedure.
Key remote control added or replaced. System malfunction.
Keys can only be programmed using diagnostic equipment.
Posted on Feb 14, 2010
Testimonial: "Spot on work great thanks."
Try this,,turn the key on ,wait 10 minutes,then turn the key off,then right back on,do this three times,a total of 30 minutes,this should reset the key fob,if this is the problem.
Posted on Apr 17, 2010
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