taeng

Hi Guys, I just picked up a 2005 E55 and the lock button on the remote doesn't work. Is there a fix for this, or do I have to purchase a new key from the dealer? They want $350!

Rocman8

Does it unlock? Does the trunk and panic button work?

taeng

Yes the unlock and trunk work fine, haven't tried the panic button

verminator

I had this issue with my only fob recently, replaced the batteries and it still was erratic in operation, then it finally would not lock the car. My main battery (in the trunk) was 6 years old so I knew it was time to replace it. I got a deal at Sams $177 on sale for an AGM replacement battery. I put the battery in and the fob works perfectly. I never had a low voltage warning. I replaced the voltage regulator and the front battery this past summer. No guarantee's here but these cars are smart and sometimes they are trying to tell us something...check your main battery in the trunk, it might be time to replace.

Rocman8

Yeah I would start with the remote battery and blow the dust out of it while the battery is out. You may be looking at a new remote and yes they are expensive.

MacVidMB-V8

likely that the key can be fixed, might be wise to buy a 2nd one from dealer first though

Elhonaz

take your mobilephone, start your camera. look at the tip ofthe key through the camera and press the buttons. you will see the infra red flashing on your screen when pressin unlock, now press lock. If theres no infrared flash the button on the keyfob is broken. quick and easy check to diagnose if the key itsefl works or not

taeng

Thanks for the tip, however I didn't see the infra red flashing on the screen. What I did notice was that the red light on the key itself blinks for unlock, but not lock.

Elhonaz

well there you have it. its the button thats broken or something else on the key itself. you can replace the broken button if your key is like the type on the video.


http://www.ebay.com/itm/3-BUTTON-SMA...cAAOSwQoFWOS5N