GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Car finally got burglarized The door locks don’t lock,What’s most likely issue

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Old Feb 8, 2025 | 07:06 AM
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2007 GL450
Car finally got burglarized The door locks don’t lock,What’s most likely issue

07 gl450. Drivers door you can push the lock down but all other doors you can’t even push on them they’re like stuck unlocked. Remote and all door buttons does nothing,just arms alarm (unfortunately had dead siren).Looking for someone who has had exact issue and can tell me what was the problem/solution. From what I have read there’s so many parts such as each door having its own electrical lock switch plus there’s multiple sams. I think from what I learned the power locks are controlled by a ebox/sam? behind passenger side rear quarter panel?And because ALL locks are not working this eliminates few things like exterior panel door switches and maybe also each doors switch/sensor that’s behind the panels?To me it’s pointing to the main ebox that controls all door locks but does that even exist?

Anyways with these symptoms the locks being stuck unlocked drives side locks by hand but that’s it,can someone point me to most likely solution without referring me to get a scanner wich in this case aint gonna tell me exactly what part is bad and even if it did I don’t have one or time and I need to fix asap.Plus I think nothing is better then learning from someone that already trial and errored this situation and fixed it. I have access to a junkyard with a dozen GL ML R,but it’s freezing I just wana go grab a few
‘most likely fix’ parts and hope it works and if you can tell me the location of these parts.

I really really appreciate any Solid help
I need to go this weekend to buy parts
I installed a alarm but doors don’t lock so that ain’t gonna cut it
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Old Feb 8, 2025 | 07:12 AM
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Unfortunately, since you say this issue affects more than one door, you can assume it’s not mechanically related but logic related. Or a broken mechanical piece nownpit a system in limo mode. In that instance, you’re going to need a scanner that can read the modules and the switches. All scanners are not created equal, and Mercedes are most efficiently fixed with a proper diagnostic tool. This will save you loads of money over your Mercedes ownership experience. LOADS

how did they break into the car? Was it a slim Jim? If that’s the case, pull off the door panel and see if they might’ve sliced a wire.

Last edited by Baltistyle; Feb 8, 2025 at 07:13 AM.
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Old Feb 8, 2025 | 07:43 AM
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2007 GL450
Originally Posted by Baltistyle
Unfortunately, since you say this issue affects more than one door, you can assume it’s not mechanically related but logic related. Or a broken mechanical piece nownpit a system in limo mode. In that instance, you’re going to need a scanner that can read the modules and the switches. All scanners are not created equal, and Mercedes are most efficiently fixed with a proper diagnostic tool. This will save you loads of money over your Mercedes ownership experience. LOADS

how did they break into the car? Was it a slim Jim? If that’s the case, pull off the door panel and see if they might’ve sliced a wire.
No they broke in the car thru unlocked door. I understand the scanner will help some but I really need to fix this today or tomorrow.The lock buttons don’t work the locks are stuck open and i forgot to mention something important the hatch doesn’t open/lock Automatically,the red button on hatch is dead but the door panel one unlocks it. So whatever controls the power for all these locks is the issue I am almost sure. There’s no power going to any door lock. I read there’s a Sam unit not the rear one with fuses by sub but center of vehicle behind a panel is the main ebox for all these locks. But I only read that it’s not confirmed by anyone yet. I think if I fix the hatch the doors will work and vice versa. There’s a few GL in yard I can go get few parts but I just need someone to point me to wich parts,what/where is the main computer for the locks.

Last edited by USNAVY; Feb 8, 2025 at 07:44 AM.
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Old Feb 8, 2025 | 08:23 AM
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WIS is your friend for locating all SAMs and you will need an MBstar compatible scan tool to rad out which module isn’t communicating with the rest of the car. Once you’ve identified the module at fault, either reset it or use WIS to locate it and replace it.
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Old Feb 8, 2025 | 09:01 PM
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I can say that in some older models like the 220, when the alarm siren is dead or dying it makes the doors unable to lock...lights flash oddly then sometime it would lock. Batteries in the sirens can be soldered in.

But really, the fastest thing is to get a scanner and figure out secure parking until its fixed. Even just go find an indy with xentry you can pay to read it.

Where are you located? Navy - Annapolis?
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Old Feb 9, 2025 | 01:03 AM
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2007 GL450
Originally Posted by Baltistyle
I can say that in some older models like the 220, when the alarm siren is dead or dying it makes the doors unable to lock...lights flash oddly then sometime it would lock. Batteries in the sirens can be soldered in.

But really, the fastest thing is to get a scanner and figure out secure parking until its fixed. Even just go find an indy with xentry you can pay to read it.

Where are you located? Navy - Annapolis?

Thank you. The bad alarm is something to check out.Since I bought it,it was working but as you said it was dyng horn was going bad then just quit, the locks never worked.I thought that the few symptoms might point to something in particular.

It seems with MB on this group it’s always get a scanner wich I understand and agree with but as in my Toyota group you almost always have the common issue that is resolved through trial and error in the past.MB imo is no different almost every issue is ‘common’ and has been addressed and resolved but you just need to hope you find it reading all the old posts or someone with knowledge of that particular issue responds

I'm in Chicago. There’s plenty of junk yards with these cars. I think the locks being unable to be pushed down manually,the hatch lock not working,the door buttons not working,would point to the cause. I’m 90% sure it’s the Main computer that controls the locks but I don’t know where it’s located or what’s it’s called. All I got from reading is there is a ebox on passenger side backseat panel that controls ALL locks Hatch doors etc.And I’m sure a scanner that I can afford $200 max will not tell me the exact issue.I figured to grab as many parts as possible but I was hoping to learn where all these parts are located in the car before I go Tomorow so I don’t miss anything
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Old Feb 9, 2025 | 01:07 AM
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2007 GL450
Originally Posted by Max Blast
WIS is your friend for locating all SAMs and you will need an MBstar compatible scan tool to rad out which module isn’t communicating with the rest of the car. Once you’ve identified the module at fault, either reset it or use WIS to locate it and replace it.

Is the File for WIS in this group anywhere?Does it specify say this module controls the cars locks.
Thank you for responding
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Old Feb 9, 2025 | 05:56 AM
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Originally Posted by USNAVY
Thank you. The bad alarm is something to check out.Since I bought it,it was working but as you said it was dyng horn was going bad then just quit, the locks never worked.I thought that the few symptoms might point to something in particular.

It seems with MB on this group it’s always get a scanner wich I understand and agree with but as in my Toyota group you almost always have the common issue that is resolved through trial and error in the past.MB imo is no different almost every issue is ‘common’ and has been addressed and resolved but you just need to hope you find it reading all the old posts or someone with knowledge of that particular issue responds

I'm in Chicago. There’s plenty of junk yards with these cars. I think the locks being unable to be pushed down manually,the hatch lock not working,the door buttons not working,would point to the cause. I’m 90% sure it’s the Main computer that controls the locks but I don’t know where it’s located or what’s it’s called. All I got from reading is there is a ebox on passenger side backseat panel that controls ALL locks Hatch doors etc.And I’m sure a scanner that I can afford $200 max will not tell me the exact issue.I figured to grab as many parts as possible but I was hoping to learn where all these parts are located in the car before I go Tomorow so I don’t miss anything
Not accurate for MB. I can troubleshoot my GM or Toyota product with either onboard diagnostics or a simple OBD 2 code reader, but this is not true for MBZ.

it does require a two way scan tool to effectively troubleshoot. The Wis is available online as a one time access subscription or periodical.
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