Huge electric problem? Im confused.
Thread Starter
Newbie
Joined: Sep 2022
Posts: 5
Likes: 6
W212 200cDI 2014
Huge electric problem? Im confused.
Hello, ill try to explain this step by step of what was happening today with my 2014 W212 200CDi.
Everything has been fine until today.. In the morning today i took a short drive for like 15 minues, as soon as putted the car in R the messages for Faulty lights on trailer was popping up, backlights, turn lights etc. BUT i didnt even have a trailer hanging after the car, so... and no other malfunction codes, only this..
..i went home, didnt think about it to much, was trying to start the car again after 5-6 hours, but then every lamp in the dashboard was just blinking and no messages in the screen was popping up, i tried a few times, nothing happened, when i turned the ignition all off the lamps still blinked and stopped when i removed the key from the ignition..
i decided to charge the battery wich i did after i disconnected it, charged for about 3 hours, connevted it back, bur t now its completley dead, only flashes in backlights 1 time and i can hear the window on drivers side doing a little move, this is when i turn ignition on, but every other stuff is black, even the rooflamps.
after this, i tried to put on the charger when battery was connected but no sign of electricity then..
any smart heads here that know this problem?
Everything has been fine until today.. In the morning today i took a short drive for like 15 minues, as soon as putted the car in R the messages for Faulty lights on trailer was popping up, backlights, turn lights etc. BUT i didnt even have a trailer hanging after the car, so... and no other malfunction codes, only this..
..i went home, didnt think about it to much, was trying to start the car again after 5-6 hours, but then every lamp in the dashboard was just blinking and no messages in the screen was popping up, i tried a few times, nothing happened, when i turned the ignition all off the lamps still blinked and stopped when i removed the key from the ignition..
i decided to charge the battery wich i did after i disconnected it, charged for about 3 hours, connevted it back, bur t now its completley dead, only flashes in backlights 1 time and i can hear the window on drivers side doing a little move, this is when i turn ignition on, but every other stuff is black, even the rooflamps.
after this, i tried to put on the charger when battery was connected but no sign of electricity then..
any smart heads here that know this problem?
Out Of Control!!
Joined: Apr 2019
Posts: 11,994
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
super combo 😳
You E'14 had a Christmas lights party and displayed a collection of bad rear lights messages.
You disconnected the battery, recharged it and now the ignition is not responding.
> The main assumption here is your main $200 battery is as good as new after recharging it... I'd question that first before going any further. Measure the voltage under load or get battery tested at the local store.
> The next thing is when you reconnect power you're supposed to pop keylessGo button and use the key in ignition once.
> You can try to do another proper Reboot with AUX disconnected.
> Buy an OBDII scanner to read all active faults. Then reset faults created by marginal voltage operations.
Why NOT use flat batteries:
-- Low voltage fries electrical contacts with high currents to deliver power (P= U x I).
-- In MB parlance it browns the delicate circuit contacts combs deep inside SAM's.
-- Float your batteries to achieve low-R efficiency.
✌️
You disconnected the battery, recharged it and now the ignition is not responding.
> The main assumption here is your main $200 battery is as good as new after recharging it... I'd question that first before going any further. Measure the voltage under load or get battery tested at the local store.
> The next thing is when you reconnect power you're supposed to pop keylessGo button and use the key in ignition once.
> You can try to do another proper Reboot with AUX disconnected.
> Buy an OBDII scanner to read all active faults. Then reset faults created by marginal voltage operations.
Why NOT use flat batteries:
-- Low voltage fries electrical contacts with high currents to deliver power (P= U x I).
-- In MB parlance it browns the delicate circuit contacts combs deep inside SAM's.
-- Float your batteries to achieve low-R efficiency.
✌️
Last edited by CaliBenzDriver; Sep 13, 2022 at 05:43 PM.
Thread Starter
Newbie
Joined: Sep 2022
Posts: 5
Likes: 6
W212 200cDI 2014
You E'14 had a Christmas lights party and displayed a collection of bad rear lights messages.
You disconnected the battery, recharged it and now the ignition is not responding.
> The main assumption here is your main $200 battery is as good as new after recharging it... I'd question that first before going any further. Measure the voltage under load or get battery tested at the local store.
> The next thing is when you reconnect power you're supposed to pop keylessGo button and use the key in ignition once.
> You can try to do another proper Reboot with AUX disconnected.
> Buy an OBDII scanner to read all active faults. Then reset faults created by marginal voltage operations.
Why NOT use flat batteries:
-- Low voltage fries electrical contacts with high currents to deliver power (P= U x I).
-- In MB parlance it browns the delicate circuit contacts combs deep inside SAM's.
-- Float your batteries to achieve low-R efficiency.
✌️
You disconnected the battery, recharged it and now the ignition is not responding.
> The main assumption here is your main $200 battery is as good as new after recharging it... I'd question that first before going any further. Measure the voltage under load or get battery tested at the local store.
> The next thing is when you reconnect power you're supposed to pop keylessGo button and use the key in ignition once.
> You can try to do another proper Reboot with AUX disconnected.
> Buy an OBDII scanner to read all active faults. Then reset faults created by marginal voltage operations.
Why NOT use flat batteries:
-- Low voltage fries electrical contacts with high currents to deliver power (P= U x I).
-- In MB parlance it browns the delicate circuit contacts combs deep inside SAM's.
-- Float your batteries to achieve low-R efficiency.
✌️
tried with new battery now, everything is still dead, no lights, nothing..
Last edited by NorMBAlex; Sep 14, 2022 at 05:22 AM.
Out Of Control!!
Joined: Apr 2019
Posts: 11,994
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
getting interesting...
Brand new battery but still "no lights......."
Obviously power is not reaching where it's supposed to... switching power is SAM's and prefuse job
> Check the battery connections and GND strap to chassis are ok. If you have an old $20 multimeter now is a good time to play with it.
(> FYI: do not leave your new battery connected without a float charger as you run the danger to get the new battery run down overnight).
> Any lights okay, we have no dashlights but then...
How about turn on headlights switch manually?
How about brakelights?
> Rain soaked: reach under front carpets on either side for sign of moisture...
> Do you have an AUX battery in the trunk or driver side dash?
> What happened last time time this car was driven and then after that... ?
Obviously power is not reaching where it's supposed to... switching power is SAM's and prefuse job
> Check the battery connections and GND strap to chassis are ok. If you have an old $20 multimeter now is a good time to play with it.
(> FYI: do not leave your new battery connected without a float charger as you run the danger to get the new battery run down overnight).
> Any lights okay, we have no dashlights but then...
How about turn on headlights switch manually?
How about brakelights?
> Rain soaked: reach under front carpets on either side for sign of moisture...
> Do you have an AUX battery in the trunk or driver side dash?
> What happened last time time this car was driven and then after that... ?
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,632
From: North Scottsdale, AZ
'71 Pinto
Thread Starter
Newbie
Joined: Sep 2022
Posts: 5
Likes: 6
W212 200cDI 2014
Hello, and thanks for all the help here, but i figured out this problem in the end.
After changing both batteries, starter and aux battery, it was still dead. I then checked every corner of the car, and in the trunk on left hand side where all the fuses are, there was a module, it was all wet, i opened it up and it was nearly full green of corrosion, i dried it and sprayed electric spray, then let the cables dry up, plugged it all together, voila, the car is good as new! Just needed to adjust everything after battery change.
After changing both batteries, starter and aux battery, it was still dead. I then checked every corner of the car, and in the trunk on left hand side where all the fuses are, there was a module, it was all wet, i opened it up and it was nearly full green of corrosion, i dried it and sprayed electric spray, then let the cables dry up, plugged it all together, voila, the car is good as new! Just needed to adjust everything after battery change.
Trending Topics
Out Of Control!!
Joined: Apr 2019
Posts: 11,994
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
extra strange...
Hello, and thanks for all the help here, but i figured out this problem in the end.
After changing both batteries, starter and aux battery, it was still dead. I then checked every corner of the car, and in the trunk on left hand side where all the fuses are, there was a module, it was all wet, i opened it up and it was nearly full green of corrosion, i dried it and sprayed electric spray, then let the cables dry up, plugged it all together, voila, the car is good as new! Just needed to adjust everything after battery change.
After changing both batteries, starter and aux battery, it was still dead. I then checked every corner of the car, and in the trunk on left hand side where all the fuses are, there was a module, it was all wet, i opened it up and it was nearly full green of corrosion, i dried it and sprayed electric spray, then let the cables dry up, plugged it all together, voila, the car is good as new! Just needed to adjust everything after battery change.
Do you have a picture of that left-hand side trunk fuse box?
Good job bringing back to life the green mystery module that was killing your car.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
MBWorld Fanatic!
Joined: May 2021
Posts: 2,527
Likes: 2,044
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
great the car is back on the road.
However, have you found the root cause? The issue was not the module, but water intrusion and if you do not fix it, get ready for another headache.
Check the trim around the trunk, it seems water is coming through the plastic pins, or a damaged seal
Out Of Control!!
Joined: Apr 2019
Posts: 11,994
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
don't stop half-way...
great the car is back on the road.
However, have you found the root cause? The issue was not the module, but water intrusion and if you do not fix it, get ready for another headache.
Check the trim around the trunk, it seems water is coming through the plastic pins, or a damaged seal
furthermore, the Rear-SAM on the righ side of trunk if it's what it is, may stay awake or wake-up peripherals to drain battery.
Both sides of R-SAM PCB can normally not be reached for proper cleaning...
However, given you know already how to clean electronic circuits... it may be possible to remove upper R-SAM cover that's attached with melted plastic posts.
That has good chances to improve the final outcome with a 100% problem cure.
🤞
MBWorld Fanatic!
Joined: May 2018
Posts: 6,633
Likes: 6,575
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Okey, within like 2 weeks we have 2 water intrusion case as the Gremlin
Our car is aging...so pay attention to anything called rubber/seal/plastic and the like....which keep water out of the car interior or trunk or engine bay Front SAM.
Sunroof drain hose also need attention
Our car is aging...so pay attention to anything called rubber/seal/plastic and the like....which keep water out of the car interior or trunk or engine bay Front SAM.
Sunroof drain hose also need attention
