Keyless entry not working
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E350 4matic
Keyless entry not working
Hi there. My keyless entry isn’t working. When I am near the car with the key fob and try to open the handle, it won’t unlock the door, and also won’t lock the car it when I push the button on the handle. The keyless go does work inside, and the buttons on the key fob work to lock and unlock the car. 2007 e350 4matic. Please advise!
Last edited by Sadieceleste; Sep 20, 2021 at 01:38 PM.
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
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E350 4matic
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Out Of Control!!
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From: North Scottsdale, AZ
'71 Pinto
If replacing battery does not resolve, best to have someone pull fault codes inclusive of checking key using Xentry (MB diagnostics). See attachment to better understand system and variants that can malfunction.
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E350 4matic
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
For example, you get in the car, key on, cluster lit, radio sounds, air conditioner blows, and the dreaded click, click and the engine does not crank.. Sometimes it is just battery, correct?
===
I have seen my share of laptops thrown out just because the coin battery is low, but not completely discharged and owners thinking they are toasted. $3 dollars later I have them running again.
Last edited by JCM_MB; Sep 21, 2021 at 01:19 PM.
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2008 E350 4Matic, 2011 E350 4matic
Usually when the handles fail, it's only one handle, one of the buttons will go first, either unlock or lock. But if all of them don't work, it sounds like a weak battery. There's different antennas involved could be one of them are bad, but most like it's a weak battery. When was the last time you changed the fob battery? I always change mine after 4-6 months. I usually grab a bunch on eBay. You should also get a volt meter to check the voltage on the battery.
You should also get one of those Apple Airtags, a lost MB key can be 500+ at MB especially for a keyless go key.
You should also get one of those Apple Airtags, a lost MB key can be 500+ at MB especially for a keyless go key.
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From: Madison, Alabama
13 E550 Coupe & 99 C280
Usually when the handles fail, it's only one handle, one of the buttons will go first, either unlock or lock. But if all of them don't work, it sounds like a weak battery. There's different antennas involved could be one of them are bad, but most like it's a weak battery. When was the last time you changed the fob battery? I always change mine after 4-6 months. I usually grab a bunch on eBay. You should also get a volt meter to check the voltage on the battery.
You should also get one of those Apple Airtags, a lost MB key can be 500+ at MB especially for a keyless go key.
You should also get one of those Apple Airtags, a lost MB key can be 500+ at MB especially for a keyless go key.
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Newbie
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E350 4matic
I was going thru batteries every 6 months while I was using the keyless go button. It's a cool feature, but I'm old school and using the key helps me keep track of my key! lol. This last key fob battery lasted almost a year, so the advice I was given by my local MB service writer was correct. He told me the keyless go drains key fob batteries. I'm lucky as I was given 3 keys from the previous owner when I purchased my car! I just 3 weeks ago took my dead key fob into the dealership and they replaced the battery for free!
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From: MA
2008 E350 4Matic, 2011 E350 4matic
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. Do not ask how I know 
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2004 e500
One possiblity is that water has seeped into the door handle and damaged the controller inside.
I replaced the internal components inside of mine and worked after.
The way the keyless go door handles work is that the small square button to lock the doors closes the circuit with 470(?) Ohms. The long button on the inside of the handle closes the circuit at 300 ohm.
I've been thinking about providing this as a service to replace the internal components. The dealership charges about 300$ for a new handle.
The front two handles are extremely easy to remove with just a single t20 bit. The rear handles are much more of a pain of replacing. So I recommend only replacing the front two handles.
I replaced the internal components inside of mine and worked after.
The way the keyless go door handles work is that the small square button to lock the doors closes the circuit with 470(?) Ohms. The long button on the inside of the handle closes the circuit at 300 ohm.
I've been thinking about providing this as a service to replace the internal components. The dealership charges about 300$ for a new handle.
The front two handles are extremely easy to remove with just a single t20 bit. The rear handles are much more of a pain of replacing. So I recommend only replacing the front two handles.
