Battery drain
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 46
Likes: 8
ML350 2015 bluetech
Battery drain
Hi,
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
Hi,
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 46
Likes: 8
ML350 2015 bluetech
I know where you going with this, was also my first reaction but i'm far enough I would say easily 20-25 meters and when I went to the dealer I notice the keys was actually closer to truck.
And I had a 2011 also with keyless, truck and keys same spot for years and never had any issues.
I actually ask the dealer a few days ago if he was starting the car with the keys or button and told me both. so my guess is that the button was not always in the socket and since it random when the button is in the socket, he never had the problem during the 2 weeks.
I even for fun borrow a friend button and after the third day the battery was drain over night.
And I had a 2011 also with keyless, truck and keys same spot for years and never had any issues.
I actually ask the dealer a few days ago if he was starting the car with the keys or button and told me both. so my guess is that the button was not always in the socket and since it random when the button is in the socket, he never had the problem during the 2 weeks.
I even for fun borrow a friend button and after the third day the battery was drain over night.
MBWorld Fanatic!
Joined: May 2017
Posts: 1,234
Likes: 153
From: Montreal/Cape Coral FL
2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
Have you checked the amperage draw with the truck off?
I've got an issue with my mom's 07' Taurus, we must've replaced the battery at least 4-5 times. Goes dead if it hasn't run in over 2-3 weeks. It's in my garage now and tests show a draw of .3 amps with everything off, which is way more than acceptable. You'll have to start pulling fuses one-by-one 'till you find the guilty circuit.
I've got an issue with my mom's 07' Taurus, we must've replaced the battery at least 4-5 times. Goes dead if it hasn't run in over 2-3 weeks. It's in my garage now and tests show a draw of .3 amps with everything off, which is way more than acceptable. You'll have to start pulling fuses one-by-one 'till you find the guilty circuit.
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
Hi,
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
I recently replace my old ML350 for a 2015 ML350 and after a few weeks a 2-3 time weeks truck won't start because the battery was dead over night.
I finally kind of located the problem and need your feedback before going back to the dealer.
Whenever the push to start button is inserted, eventually the battery end up dead over night.
I realize that If I don't insert it, don't use it at all, I have no battery drain.
Then I push my test further and use it to start the car but always remove it when I get home or park the truck for a long period of time and so far I still have no battery drain after 1 week.
What do you think could cause the battery drain when the button is in the socket?
I went to the dealer before my tests, they kept it for 2 weeks and they never had any issues with it, this time I want to keep the $$ to a minimum by having as much info as I can.
Thank You
Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
I know this is old thread, but wondering if you ever resolved this issues. I'm facing exactly the same situation on my 2012. Button kills battery after day or 2. I noticed couple of symptoms, that if I have button inserted, and sit in the car for around 5 min, feels like some relay or something else keeps clicking every min or so, and it seems somewhere under passenger side seat, where battery is located. If no button present in ignition, no sound. I also did battery draw test, with button in it draws about 5 Amps, without 0.2-3.
If your fob is far away from your car, and you are still hearing that relay like sound click (the keyless go module is under the carpet, and an antenna in the center console), then something is triggering the system and you need to have it scanned.
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
if your fob is within 10-20 feet of the car, then that is your problem. It's constantly pinging back and forth the keyless go module.
If your fob is far away from your car, and you are still hearing that relay like sound click (the keyless go module is under the carpet, and an antenna in the center console), then something is triggering the system and you need to have it scanned.
If your fob is far away from your car, and you are still hearing that relay like sound click (the keyless go module is under the carpet, and an antenna in the center console), then something is triggering the system and you need to have it scanned.
Thanks!
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Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
I will probably will have it scanned. I have it for 3 years, keys are more or less are kept at the same place all the time probably, within 20 feet. This is also second battery with past 9 month, last one 2 weeks ago. If I drive car daily, no issues, but if it's not touched for a weekend it's dead. Does anyone know know if 5 amps draw is normal for this truck if button is in ?
Thanks!
Thanks!
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MBWorld Fanatic!
Joined: May 2017
Posts: 1,234
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From: Montreal/Cape Coral FL
2012 X6 35i Sport, 2013 ML 350 BT, 2019 4Runner TRD Pro, 2020 CRV-AWD
.3 is still way too much. You should have a draw of no more than .03 to .05 after the car's been off more 10 minutes or so. I've gone thru this exact issue with my Mom's Taurus which chews the batteries with a ferocity never before known to mankind. It pulls .4 amps and the battery is stone dead within 3 weeks of non-use.
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
.3 is still way too much. You should have a draw of no more than .03 to .05 after the car's been off more 10 minutes or so. I've gone thru this exact issue with my Mom's Taurus which chews the batteries with a ferocity never before known to mankind. It pulls .4 amps and the battery is stone dead within 3 weeks of non-use.
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
Just to update, after removing push to start button battery did not discharge in few days..... now I need to figure out why push button drains battery..... anyone has any ideas ?
Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
. Will do that test later.
Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
Super Member
Joined: Sep 2018
Posts: 706
Likes: 114
From: Los Angeles, CA
'22 GLE 350 | '15 ML250 | '87 560SL | '19 GLC 300 | '12 C250 (sold) | '02 ML500 | '98 C230
Junior Member
Joined: Nov 2017
Posts: 33
Likes: 9
2012 ML 350 (W166)
