2007 GL450 airmatic troubleshooting assistance - Page 2 - Mercedes-Benz Forum
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post #11 of 18 (permalink) Old 08-03-2018, 05:45 AM
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I wish I knew the voltages those should be sending out. I’m sure it’s low voltage so I would guess the ones with 4 volts or more are sending signals that it’s needing air. The other 2 may he out. Still doesn’t explain why the air compressor doesn’t stay engaged. I have a feeling you need a new one. If it was me I would start with a new compressor and work from there. Just my 2 cents
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post #12 of 18 (permalink) Old 08-03-2018, 06:41 PM
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Have you checked the plastic rods going from sensor to strut. Someone on another forum said they can get rust in the ball socket and bind up. He said you can pull them apart and clean and lube. I haven't tried it yet on mine but i am having the same symptoms as you. For me it seems, One day it work and one day it doesnt. This seems to be a plausible theory though. I am assuming if they do bind, the car will not know level and the compressor would not kick on. Maybe someone who knows more will chime in.
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post #13 of 18 (permalink) Old 08-03-2018, 07:23 PM Thread Starter
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Quote:
Originally Posted by dkasht View Post
Have you checked the plastic rods going from sensor to strut. Someone on another forum said they can get rust in the ball socket and bind up. He said you can pull them apart and clean and lube. I haven't tried it yet on mine but i am having the same symptoms as you. For me it seems, One day it work and one day it doesnt. This seems to be a plausible theory though. I am assuming if they do bind, the car will not know level and the compressor would not kick on. Maybe someone who knows more will chime in.
I did a preliminary inspection on the sensors and they seemed OK to me. They didn't bind, they raised and lowered properly when the vehicle was jacked up, and there didn't appear to be any corrosion on them at all; in fact, I can't find ANY corrosion on the vehicle at all. It's one of the cleanest 100k miles vehicles I've ever seen. Tomorrow I'll go out and disassemble the arms from the sockets and lube them up just to be sure, but for now, see my next post for more information.
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post #14 of 18 (permalink) Old 08-03-2018, 07:38 PM Thread Starter
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So those voltages at the sensors have been bothering me. I went ahead and hooked up the Autel meter to monitor the voltages as I raised each corner of the vehicle. The most bizarre thing seems to be occurring: the LF & RR (both ~4.5V on the ground) DROPPED voltage as I raised their respective corners, and the RF & LR (0.5 and 1.4V respectively) RAISED voltage as I raised their corners. This seems extremely unusual to me. I couldn't say if they were exhibiting this behavior prior to this failure since I had no means and no reason to check, but that's where they are now.

Also, I wanted to confirm that I was in fact getting voltage to the compressor since I didn't feel I measured it correctly the last time. I pulled the relay and measured the voltages at the two line terminals using a spade fuse that I sacrificed and I did in fact have 14V at one of the line terminals. I then tried to jumper the line together to get the compressor to kick on and nothing happened. I'm beginning to agree with shadow that the compressor may have gone out, though I don't know if the level sensors have anything to do with anything right now.
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post #15 of 18 (permalink) Old 08-15-2018, 08:57 AM Thread Starter
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So after inspecting the level sensors and finding nothing obviously wrong with them, I bought a compressor as my next step. To my surprise, that did in fact turn out to be the problem. I'll now perform a full leak check to ensure I'm not leaking anywhere, but otherwise I should be good to go.

One weird thing though: the voltages for my level sensors are now all back in line with where they should be, i.e. around 2.0 V. I'm not sure how a failed compressor could cause these voltages to go weird, but it no longer seems to be an issue.

I hope this thread helps others in the future.
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post #16 of 18 (permalink) Old 07-20-2019, 10:23 AM
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Hello , I am new to the page and have come here for the same issue you had. I was wondering how is your vehicle running?
I have a 2012 GL 450 about 105k miles .
I have the malfunction on dashboard on. My truck was lowering on the driver side so i figured it was my air spring. Replaced with Arnott air spring part #a7525 did all the harwork and come to fing out that didnt solve my issue. I can hear the compressor working when I turn on ignition , souds like its working after a few minutes it stops and does not raise the FL side. I press the raise button and seems to pump air into the other 3 sides except the one. Would anyone have any idea of what my problem could be?
Maybe I also need to replace the compressor?
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post #17 of 18 (permalink) Old 07-21-2019, 02:33 PM
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You most likely have a leaking hose.


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post #18 of 18 (permalink) Old 07-24-2019, 11:36 AM
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That's a leak.

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