Wipers, brake lights, blinkers, remote, Gas g trunk , rear seat won't work and more
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Joined: Sep 2018
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GL450
Wipers, brake lights, blinkers, remote, Gas g trunk , rear seat won't work and more
Car was working fine until I tried to fill up the tank but gas tank door won't open either with remote or unlocking from driver's door manually. Drove home and gas tank door opened. Drove back to gas station and filled up but car won't start. Good samaritan came and told me to remove the press start and use the keys. Car cranked but fuel gauge didn't work. Since then, remote, rear seat buttons, wipers, brake lights, blinkers, trunk won't work. SRS light came on, restraint, blind spot assist won't work and lastly engine light came one. Took it to the dealership, I was told the SAM is corroded but the car or the compartment was never wet. I replaced the relay someone mentioned here for similar issues but didn't work. Before spending $1500 at dealership to replace SAM and still not sure if that will solve the issues, any help will do.
The car or SAM is not wet, only thing I could think of maybe corrosion during bad heat few weeks ago in Maryland. If you have good fuse diagram for the 2012 gl450, I will appreciate it too. I see the SAM, is it easy to take it out for cleaning?
Thanks all
2012 GL450
The car or SAM is not wet, only thing I could think of maybe corrosion during bad heat few weeks ago in Maryland. If you have good fuse diagram for the 2012 gl450, I will appreciate it too. I see the SAM, is it easy to take it out for cleaning?
Thanks all
2012 GL450
Last edited by easylife2002; Sep 24, 2018 at 03:00 PM. Reason: typo in heading
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Joined: Nov 2017
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From: Bethesda, MD
2010 Mercedes GL450; 2000 Mercedes ML55 AMG; 2016 VW GLI SEL Stick!!!
Car was working fine until I tried to fill up the tank but gas tank door won't open either with remote or unlocking from driver's door manually. Drove home and gas tank door opened. Drove back to gas station and filled up but car won't start. Good samaritan came and told me to remove the press start and use the keys. Car cranked but fuel gauge didn't work. Since then, remote, rear seat buttons, wipers, brake lights, blinkers, trunk won't work. SRS light came on, restraint, blind spot assist won't work and lastly engine light came one. Took it to the dealership, I was told the SAM is corroded but the car or the compartment was never wet. I replaced the relay someone mentioned here for similar issues but didn't work. Before spending $1500 at dealership to replace SAM and still not sure if that will solve the issues, any help will do.
The car or SAM is not wet, only thing I could think of maybe corrosion during bad heat few weeks ago in Maryland. If you have good fuse diagram for the 2012 gl450, I will appreciate it too. I see the SAM, is it easy to take it out for cleaning?
Thanks all
2012 GL450
The car or SAM is not wet, only thing I could think of maybe corrosion during bad heat few weeks ago in Maryland. If you have good fuse diagram for the 2012 gl450, I will appreciate it too. I see the SAM, is it easy to take it out for cleaning?
Thanks all
2012 GL450
Front is under passenger front footwell. It could have been a dropped drink or something.
Also is your battery original? It might be a dying battery.
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GL450
So I should just go and replace it? Or what do you think about the folks that talks about removing it and cleaning the corrosion? The MB dealership tech was talking about drains from rear sunroof and tailgate that could have allowed water to damage the rear SAM that's how the car was designed. MB could do better. To replace the rear sam is $1500 but the rear SAM at MB dealership cost $400, so $1100 is labor. It's crazy.
MBWorld Fanatic!
Joined: Nov 2017
Posts: 1,218
Likes: 149
From: Bethesda, MD
2010 Mercedes GL450; 2000 Mercedes ML55 AMG; 2016 VW GLI SEL Stick!!!
So I should just go and replace it? Or what do you think about the folks that talks about removing it and cleaning the corrosion? The MB dealership tech was talking about drains from rear sunroof and tailgate that could have allowed water to damage the rear SAM that's how the car was designed. MB could do better. To replace the rear sam is $1500 but the rear SAM at MB dealership cost $400, so $1100 is labor. It's crazy.
Yes. I've heard water seeps in and collects there ruining the Sam.
If you ask nicely and provide your vin maybe Alx can post the mb instructions on how to remove the Sam. He sometimes has access to those documents.
Otherwise there are threads of people who upgraded the Sam to upgrade their rear tailigtts to led. Youll find instructions on Sam removal there as well.
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GL450
VIN # 4JGBF7BE4CA772875
2012 gl450
2012 gl450
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Thread Starter
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GL450
You can email the instructions to me at aoel2006@aol.com
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GL450
still waiting on rear sam removal instruction
Please I'm still waiting on rear sam removal instruction from Alx. You can drop it here on forum or to my email easylife2002@aol.com or aoel2002@aol.com
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GL450
Junior Member
Joined: Feb 2019
Posts: 17
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From: Outside Memphis, TN
GL450 4matic
How did cleaning corrosion from the rear SAM work for you? I'm having similar issues. I found water under both front seats. My wipers, cruise, horn, hi-beams, turn signals, pass. rear foglight, and tailgate are not working. I pulled the front AND rear SAM to inspect and treat corrosion. I'm wondering if I have to have it programmed since the battery was disconnected for about a month?
Thread Starter
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GL450
How did cleaning corrosion from the rear SAM work for you? I'm having similar issues. I found water under both front seats. My wipers, cruise, horn, hi-beams, turn signals, pass. rear foglight, and tailgate are not working. I pulled the front AND rear SAM to inspect and treat corrosion. I'm wondering if I have to have it programmed since the battery was disconnected for about a month?
Junior Member
Joined: Feb 2019
Posts: 17
Likes: 5
From: Outside Memphis, TN
GL450 4matic
I cleaned the corrosion on the rear SAM but the issues didn't get resolved. I bought new battery as well but nothing changed. I didn't take it for reprogramming since the auxiliary battery was not disconnected. I ended up selling the beautiful car on Copart. Wish you good luck on resolving your issues. Benz told me $1300 plus tax to replace the SAM as a "start". I already had $200 for diagnostics and I didn't feel like venturing into infinite repairs.
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GL450
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GL450
I did the reset several times too. I hope it works for you. Mine was 2012. I wanted to buy older year thinking there would be less complication but from your experience, it's all the same.
Newbie
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2007 Gl550
Did you finally get it fixed? I have been having the same problem and the car is parked for a year now
Last edited by Chuk Chukwurah; Sep 28, 2019 at 06:40 AM.
Newbie
Joined: Sep 2025
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From: The PNW
2007 Mercedes Benz GL450
are you saying that the central gateway controller is the culprit for all the stalks going down on the left side of the wheel plus the two manual shift buttons and the horn? I replaced the SCM today to no avail lmao it is doing the exact same thing still😂
