I have a 2007 R63 with a dead battery. The keyless go will not work. I tried to use the metal key in the remote. It turns; but, it does not unlock the vehicle. I believe I left the lights on. I am assuming the aux battery is dead also.

Any idea on how to open the vehicle or the hood. I would prefer not to do any damage if possible.

Success!!! The key probably has not been used in years. I turned the key and gave the handle a few quick tugs and it opened.

Looks like I will be replacing the aux battery and testing the main battery.

Moral of the story.. Keep your door locks oiled!

I had the same issue recently. My R500 has an intermittent current drain that can leave the battery dead if the car sits for a week or more. So, when it pulled this trick a few weeks ago, like you I thought no problem, I'll just use the physical key to open the door. And like you it didn't work at first. It took a few seconds and attempts to get the lock cylinder to respond to the metal key. I haven't done it yet but maybe a squirt of WD40 is in order.

Thank you Brian425 for your post. it helped. my husband left some of the lights on and the battery drained, we were not sure of what to do until you found this post. the metal key and the remote won t open the car, I have tried putting the metal key in and out while giving the handle few tugs and ....boom chika boom...Success. I was so happy that I have succeeded in something my husband was afraid to do

Glad it helped Hoda.

You can buy graphite any place they cut keys. Put a little in the lock and in the key once a year and open the door with the key. $1.99 well spent.

Having the same problem and could also open it by trying and insisting. Strange system...

Now my problem is that my battery is totally dead after 3 1/2 weeks abroad. Not a single light, so I decided to charge the battery. It's been several hours now, but it doesn't seem to charge at all.

I also tried to jump it with my wife's car. Power came (lights, etc.) but not enough to start the engine

Anyone has a clue and advice?

I believe your main battery is toast. If you replace it be sure to change out the aux battery while the floor is up. The main battery is a group 49.

Gary

Welk, I changed both batteries 1 month ago.

Since the battery is so new, you must have some kind of parasitic draw on the battery. Once a battery is stone dead, it can be hard to jumpstart them.

Good luck.

Also, if you could not jump start it, you must be doing it wrong. Make sure you have a good, clean connection on both cars to the correct spot. I have had similar trouble in jump starting cars in the past and it was always due to a not clean contact.

I eventually managed to get it started after some struggle: I had to jump it and leave it "charging" like this for around 20 minutes, until there was enough power to start it. Looks like when a battery is completely dead, jumping it is not necessarily sufficient. Or one might need a similar car with strong alternator, I don't know really. But I'm glad it started, I did let the engine run and drove a bit for two hours, and then tried to charge it again. This time the charge went fine.

You either have a parasitic draw or a bad alternator/regulator. Simply charging the battery will not solve the issue.

Hi Brian,

Very much right. Actually I forgot to mention an important fact: I found what must have been the culprit. I had let an OBD Bluetooth device in the diagnosis plug. I hope it's just that. So far the charge seem to hold, even though I haven't let the car more than 3-4 days without use since the incident.