Replace Key Fob Battery
Member
Joined: Nov 2018
Posts: 213
Likes: 119
From: Brazil
W212 (212.065/276.820)
To Reboot car computers...
You simply need to disconnect both batteries: the MAIN and AUX for 15mn.
Don't jump car side ( + ) side to ( - )... let is safely self-discharge.
Following that reboot, scan the car to collect fault codes, note codes then reset faults with scanner.
At this point your car SAM/CGW will work as good as possible without fixing the KeylessGo solderless circuit board. So try the above procedure as a first step knowing expectations - I personally reboot once or twice a month despite my keyless now working perfectly.
You simply need to disconnect both batteries: the MAIN and AUX for 15mn.
Don't jump car side ( + ) side to ( - )... let is safely self-discharge.
Following that reboot, scan the car to collect fault codes, note codes then reset faults with scanner.
At this point your car SAM/CGW will work as good as possible without fixing the KeylessGo solderless circuit board. So try the above procedure as a first step knowing expectations - I personally reboot once or twice a month despite my keyless now working perfectly.
Regarding the resoldering process of those solderless modules, how complex of a job are we talking about? Like a reflow soldering process that need to be done using special equipment?
MBWorld Fanatic!
Joined: May 2012
Posts: 2,363
Likes: 1,556
From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Question: how does one reboots the car modules to recover from this soft-crashes? The batteries on my KeylessGO really don't last more them a month before I get a low battery warning. They are very cheap (the batteries) but it did stroke me as odd that they would last so little.
Joined: Nov 2016
Posts: 7,847
Likes: 3,499
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
When washing the car, I set the key on the driver's (or passenger's) seat to keep it from locking and unlocking.
MBWorld Fanatic!
Joined: May 2012
Posts: 2,363
Likes: 1,556
From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Last edited by pierrejoliat; Jan 20, 2024 at 09:20 AM.
Member
Joined: Nov 2018
Posts: 213
Likes: 119
From: Brazil
W212 (212.065/276.820)
To Reboot car computers...
You simply need to disconnect both batteries: the MAIN and AUX for 15mn.
Don't jump car side ( + ) side to ( - )... let is safely self-discharge.
Following that reboot, scan the car to collect fault codes, note codes then reset faults with scanner.
At this point your car SAM/CGW will work as good as possible without fixing the KeylessGo solderless circuit board. So try the above procedure as a first step knowing expectations - I personally reboot once or twice a month despite my keyless now working perfectly.
You simply need to disconnect both batteries: the MAIN and AUX for 15mn.
Don't jump car side ( + ) side to ( - )... let is safely self-discharge.
Following that reboot, scan the car to collect fault codes, note codes then reset faults with scanner.
At this point your car SAM/CGW will work as good as possible without fixing the KeylessGo solderless circuit board. So try the above procedure as a first step knowing expectations - I personally reboot once or twice a month despite my keyless now working perfectly.
I installed a new key fob battery today to check if it had any impact or if resoldering the keyless go module is the only way to go.
Thank you!
Out Of Control!!
Joined: Apr 2019
Posts: 12,253
Likes: 6,916
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Did the reset today and ran the Xentry diagnostics afterwards. The only code that came back was related to the command online being unable to login into the server but that was because the time and date were not updated yet after the reset. The ones related to the back-up camera are recurring and after reading your post regarding the solderless pins, I'm pretty confident that the connection between the body CAN and the camera is not working properly. I'll troubleshoot that component first. The front door modules are another that keep generating stored faults out of the blue and might be good candidates for a resoldering job.
I installed a new key fob battery today to check if it had any impact or if resoldering the keyless go module is the only way to go.
Thank you!
I installed a new key fob battery today to check if it had any impact or if resoldering the keyless go module is the only way to go.
Thank you!
I've read your Xentry fault report. Not too bad
> How to best proceed...
Fix what you want to be reliable first, right?
- KeylessG + 4x DCU's
- then R-SAM + EZS
- then Miscellaneous.
My crazy RFK rivals with yours: same faults!!
What an epic Mercedes failure straight from factory.
The camera acts like it is working but the software is super crazy upset - There is no better firmware update for it.
I believe this BUG IS POOR HW HARNESS. The module is not able to communicate with ignition, nor dashboard, nor COMAND.... glorious!
Notice the RFK uses an extra long twisted-pair cable run... I think if we do the opposite of what Benz did on purpose, we have a chance for RFK to run well.
Try running shielded cable on noise-free driver side away from noisy 3-hases DC fuel pump that's on rear passenger side.
✌️
Last edited by CaliBenzDriver; Feb 3, 2024 at 12:23 AM.
Member
Joined: Nov 2018
Posts: 213
Likes: 119
From: Brazil
W212 (212.065/276.820)
Thank you for the tips! It's a lot of work to trouble shoot digital data bus specially when poor electrical connections and grounding come into play. Is a cat and mouse game...
Good to know I'm not alone on the RFK craziness! Looking at the wiring diagrams, the camera has a video composite connection that goes directly to the HU and this is why we believe it's working properly. Any high-level functions depending on the digital databus is likely inoperative. It makes a lot of sense that interference plays a big role in this case. I've checked the other Xentry reports I have and always the same four module pop-up but with varying occurrences rates, except for the EZS which is always maxed out at 255 occurrences. I'll work my way trough the CAN wires starting from the camera and work my way up to the front, but shielding the harness seems like a very good idea.
Good to know I'm not alone on the RFK craziness! Looking at the wiring diagrams, the camera has a video composite connection that goes directly to the HU and this is why we believe it's working properly. Any high-level functions depending on the digital databus is likely inoperative. It makes a lot of sense that interference plays a big role in this case. I've checked the other Xentry reports I have and always the same four module pop-up but with varying occurrences rates, except for the EZS which is always maxed out at 255 occurrences. I'll work my way trough the CAN wires starting from the camera and work my way up to the front, but shielding the harness seems like a very good idea.
Junior Member
Joined: Nov 2009
Posts: 19
Likes: 0
From: Pearland TX.
2008 E550 and 1984 Porsche 944
2008 MB key remote cover removal
All I know is that I cannot remove the covers on my 2008 MB remotes to replace the batteries.
Viewed the YouTube videos and still no luck.
Viewed the YouTube videos and still no luck.
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From: Chicago
19 GLA45, 86 560SL, former: 14 E550 4Matic, 09 E350 4Matic, 83 240D manual, 78 450SLC, 81 500SLC
DId you try using the metal key to push inside the little channel until the cover pops off? I can't really see how that would fail unless the clip broke off and somebody glued the cover on...
MBWorld Fanatic!
Joined: May 2012
Posts: 2,363
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From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
