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Replace key battery warning remains after new battery

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Old 02-25-2018, 08:23 PM
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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
Old 02-25-2018, 09:27 PM
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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
Old 04-02-2018, 03:19 PM
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They tried to charge me $20.00 to replace the key fob battery. Lol. Bought a two pack and replaced them myself for $6.00

Last edited by CO2010; 04-02-2018 at 03:22 PM.
Old 04-23-2018, 11:35 AM
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Originally Posted by fabbrisd1
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
Darn it !! I knew I was doing something wrong before replacing the battery 3 times......
Old 05-18-2018, 02:19 PM
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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.
Old 12-27-2018, 01:34 PM
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Nice one

Perfect, worked!

thanks
Old 04-30-2019, 09:29 PM
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Last edited by Benzto Box; 05-01-2019 at 01:22 AM. Reason: wrong thread
Old 10-19-2021, 04:44 PM
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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

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