Mercedes Benz of Arrowhead Official Blog
Dead Battery? Doors Locked? Don’t Panic
By blogsadmin | Posted in DIY, How-To, Repair, Service, Tips/Tricks on Tuesday, February 23rd, 2016 at 9:32 pm
How to unlock Mercedes-Benz with dead battery
Keyless entry and push-button start systems have saved the world countless seconds of time by removing the key from the equation. Remember trying to find the ignition in the dark only to realize how all those scratches showed up in the first place? The only real problem with new technology is that no one knows how to use it. So if you’ve locked your keys in your car, don’t worry because Mercedes-Benz has thought of everything. Here is how to unlock your Mercedes-Benz when the battery dies.
Read More: Mercedes-Benz Car Washing Tips
Valet Key
A valet key is one that it used to lock personal belongings in the glove box and trunk while your S-Class is being parked by the valet. You may already be aware of what a valet key is, but many people are surprised to find out where it is located.
Step 1
All Mercedes-Benz key fobs contain a valet key inside of them. Look where the fob is attached to the key ring. There is a little clip. Push that clip to the side and the valet key will pop out.
Step 2
With this, you can put it into the small open slot underneath your driver’s side door handle. With the key still in the slot, pull the door handle. This should pop open the cover to the right of the handle. Grab that cover and pull it off firmly. With that off, you will find a secret door lock. The valet key goes here to unlock the door.
Starter Solenoid
Step 1
This way is more complicated, but it is possible for the DIY mechanic. If you have no experience with this, it may be best to call your local service department. Step 1 is to find the starter. It can be in many different places depending on the make and model of your car, and may require you to jack the car up.
Step 2
Connect starter solenoid to a power source. This can be difficult if your starter is tucked away in a hard-to-reach spot. The most common way to do this is to use jumper cables connected to a screwdriver. Connect one end of the cables to the battery in a running vehicle. With the other end, connect the black wire to a ground source and connect the red wire to the metal rod of the screwdriver. Now you can poke the screwdriver onto the solenoid power bolt. When you see a spark, you know you’ve found it. With the screwdriver touching, click unlock on your key fob.
2003 c230 key isn’t unlocking car. Is it a new battery; if so, where do I get a new battery?!
This worked to get the car unlocked manually. Now I need to just figure out why the keyless entry did not work.
The car sat for the summer, garaged and on a trickle charge. I’ve driven it on the highway several times to fully charge the battery.
Any ideas on how to further troubleshoot the issue? It’s a 2004 SL500 with 98K miles.
I have a Mercedes a160 locked and dead battery. Can you tell me how to get into it please?
I did something silly. Flat battery,got in with Valet key started the Motor fine so far got out and let the door shut. This locked the car up Can’t open it with my spare valet key. Any suggestions
Bert