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Help, battery dead and manual door lock failure

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Help, battery dead and manual door lock failure

 
Old 06-02-2019, 02:58 PM
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2009 CLK 350
Help, battery dead and manual door lock failure

Help!

I got home from a month in Europe and the 2009 CLK 350 battery is dead. When I trued to unlock the driver's door the manual key doesn't unlock the door.

Seems I have two options: unlatch the hood manually or trickle charge the battery from the trunk fuse box. Fortunately I was able to unlock the trunk manually.

Does anyone know how I can unlatch the hood without access to the cabin?

Alternately, is there an unswitched fuse in the trunk fuse box. Seems there must be because the trunk latch is always powered on.

Thanks for the help!
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Old 06-02-2019, 03:42 PM
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2009 CLK 350
I checked with WIS and it appears that fuse 3 is unswitched since it supplies power to the rear dome light in the coupe. I'll appreciate if someone could verify that for me.
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Old 06-02-2019, 06:05 PM
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All set. Used fuse 11, which I already had tapped for a towing harness to get enough voltage to open the doors. Alarm went off and there was no way for me to turn it off until the key worked. After I got the door open I put a charger on the battery and was finally able to start it, Took it for a spin and had 14+V on the battery at ide, good. Shut the car down and the voltage dropped to 12.35V. Will see tomorrow what the voltage is and decide whether I need to replace the battery,

I was surprised that everything worked properly, windows, airbags, instrument, etc.

I'll have to see whether I am willing to replace the drivers door handle so the key works again. Will be a pain because I will have to reuse the tumbler for the old key to work.

I may install a secret way to put a charger on the battery if this happens again.
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Old 06-02-2019, 11:05 PM
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You could tap into the main feed for the rear SAM to charge the battery.

Last edited by Rudeney; 06-02-2019 at 11:07 PM. Reason: Oops! Wrong Forum!
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