Replace key battery warning remains after new battery
Thread Starter
Member
Joined: Nov 2014
Posts: 213
Likes: 6
C300
Replace key battery warning remains after new battery
Hi,
The warning came up. So I replaced the battery and tested (press button and the red LED on the key light up briefly). But the warning remains.
What should I do?
BTW, if the key battery runs out, what will happen if I"m driving?
Thanks
The warning came up. So I replaced the battery and tested (press button and the red LED on the key light up briefly). But the warning remains.
What should I do?
BTW, if the key battery runs out, what will happen if I"m driving?
Thanks
MBWorld Fanatic!
Joined: Nov 2012
Posts: 6,130
Likes: 1,117
A gaggle of MB's
Get in car - remove keyless go button - start car with key - turn off car - replace keyless button - takes 2 presses to re-start - you should be good or you bought a cheap sh*t battery
Member
Joined: Mar 2016
Posts: 111
Likes: 6
From: Chicago, IL USA
2015 Mercedes C300 Sport
Darn it !! I knew I was doing something wrong before replacing the battery 3 times......
Junior Member
Joined: Mar 2018
Posts: 51
Likes: 5
From: Hawaii
08 E350 AMG; 18 GLE 350
Sorry for asking ... so the procedure is
1. Start car with key in the ignition
2. Turn off car and remove key from ignition
3. Start car with the Keyless go button on the transmission shifter
4. Turn off car.
5. Repeat 3 and 4.
Is this the procedure to remove the Keyfob battery replacement on the console?
Advanced mahalo for the help.
1. Start car with key in the ignition
2. Turn off car and remove key from ignition
3. Start car with the Keyless go button on the transmission shifter
4. Turn off car.
5. Repeat 3 and 4.
Is this the procedure to remove the Keyfob battery replacement on the console?
Advanced mahalo for the help.
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Newbie
Joined: Jul 2021
Posts: 6
Likes: 0
W212 E550
This is what works for me and it works every time.
1. Set in the car with FOB and close the door.
2. Open FOB and remove the battery
3. Install the new fresh battery in FOB
4. Start the car
5. Turn off ca.
6. All done
1. Set in the car with FOB and close the door.
2. Open FOB and remove the battery
3. Install the new fresh battery in FOB
4. Start the car
5. Turn off ca.
6. All done
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