There's no automotive forum so I'm asking here. I have '08 C class Merc. that I haven't...

[brush]

driven in months. It's in the garage and the battery of course is dead. My key fob also seems dead...doesn't open the doors anymore, not active.

Does this happen because the dead battery? Anyone have an idea to get this working so I can get in the car to get a new battery as I intend to sell the car.

Do I have go to Mercedes to get a new fob? Very expensive I suspect.

[ret5hd]

1. If the car battery is dead, of course the fob won't work.

The small electric “motors” that lock/unlock the doors need juice to operate.

Maybe there’s something I don’t understand about mercedes, but that’s the way I figure it.

[Shellback Squid]

2. USUALLY THERE IS A KEY INSIDE THE FOB TO UNLOCK THE DOORS WHEN THE battery has failed

cap lock was on...pop the hood to jump start it then keep it running until you take it to a shop or parts store( where they usually replace the battery with no labor charge)

[hlthe2b]

15. Exactly. I've never seen a fob that does not have a tiny pull out compartment with a valet key

[Achilleaze]

17. Yep

You can probably find a youtube video showing you how to get the key out of the fob.

[Timewas]

3. Battery

The door locks require electricity to operate so if battery is dead so are locks, charge it up and should be fine

[quickesst]

4. Might be completely wrong but....

..... doesn't a key fob need an active signal in order to activate the locks? Seems like that signal would not be there if the battery was dead. Hopefully, when you put the car in your garage, you left the doors unlocked. Like I said, I may be wrong about this, so maybe someone will offer up a different solution. Good luck

[Jm7603]

5. Key fob batteries last a very long time. The odds of both going dead

at the same time are slim. If you can get the hood open (assuming that your battery is in the engine compartment. Most are) and replace or charge the car battery you will probably be ok. Most cars have a way to open the door in case of a dead fob.

[Shellback Squid]

6. it's a 2008 mercedes, the lithium batteries last about 5 years or so

[3Hotdogs]

10. --- easily replaced.

[Postal Grunt]

7. RE: Fob

Have you checked or replaced the battery in the fob lately? There are plenty of Youtube videos on replacing batteries. It's the least expensive place to start.

[brush]

16. Thank you. I'll try that.

[Make7]

8. Isn't there a mechanical key hidden in the fob?

(1½ minutes)

ETA - I think the battery is in the trunk. Right side under floor.

ETA2 - Automobile Enthusiasts (Group)
          https://www.democraticunderground.com/?com=forum&id=1205

[TreasonousBastard]

14. My car isn't a Mercedes, but the battery is in the trunk (too little room with all the crap under...

the hood).

But, under the hood is a fairly obvious connection for jumper cables. Under the hood is the long time connection everybody understands, and it might be much easier than moving shit out of the trunk.

[MichMan]

9. There is an Automobile Enthusiasts group

[3Hotdogs]

11. I'd be more worried about the engine if you start it up for the first time in months.

By now, the lubrication is gone.... drained to the bottom of the oil pan.

I would ask, or post here, how to start an engine that hasn't been run in a long time.

[sarcasmo]

12. I used batteries plus stores to change the key fob battery, it's cheaper. Link below

https://www.batteriesplus.com/?locationofinterest=&locationphysical=1028202&utm_source=google&utm_medium=search&utm_campaign=ecommppc&gclid=Cj0KCQjw0umSBhDrARIsAH7FCodPbolj0TgihsW1yjqTWVrrwiQuZI-jvSrc2T_GnodCm0ISwLlmTIsaArp6EALw_wcB

[SheltieLover]

13. Auto group link

https://www.democraticunderground.com/?com=forum&id=1205