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I have a 2007 gl450 that has had many suspension issues.

Customer Question
I have a 2007...

I have a 2007 gl450 that has had many suspension issues. I've replaced the front struts and rear air bags. I recently had to replace the ride height sensor on the rear passenger side, but now the suspension won't respond. I've also replaced the compressor about 6 months ago. I had a mobile MB mechanic take a look at it, and he got the system to respond and even raised it. I tool it to the dealer and they charged me $300 and all they told me was that I should replace the sensor with a factory sensor which would lost me another $400. I bought another sensor online and installed it myself but still can't get the suspension to respond. I've searched on how to reset the system but can't find anything other than to disconnect the power terminal. Cam you help me figure this out

Mechanic's Assistant: How has the ride been lately? Have you noticed any fluid under the car?

The rear us low and has been bouncing and bottoming out. No fluid leaks

Mechanic's Assistant: What is the model of your '07 Mercedes?

2007 GL 450

Mechanic's Assistant: Are you fixing your GL yourself? What have you tried so far?

Replaced the compressor. Replaced the fuses and relay. Replaced the ride height sensor twice

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I replaced the rear sensor because the arm broke and that's when my problems started

Submitted: 11 months ago.Category: Mercedes
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Answered in 9 minutes by:
8/18/2017
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,102
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

what do you mean by you cant get the suspension to respond?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

the sensors never are at fault, usually its the plastic arms on the sensor brackets, they corrode to the socket joint and cause leveling issues, can you verify if yours move freely?

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Customer reply replied 11 months ago
It says malfunction on the dash and it simply won't work. It will not go up or down. I checked for power on the fuses but there isnt anything at all. The arm on the sensor is moving freely as well.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

ahh ok, if the malfunction comes on right away then there is a signal malfunction and the control module is locking out compressor function,

can you tell me if you were ever given any fault codes? from the dealer or the mobile tech?

where are you located?

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Customer reply replied 11 months ago
The dealer said the sensor is shooting different numbers. So I bought a new one and installed it today, but it's still not working
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

ok, a code would be nice, hmmm

I can definitely help with this. but it would be nice to have a scan tool that can read the values, I do not suggest replacing any parts until we can get some live data to look at , what are your options?

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Customer reply replied 11 months ago
I've hit a dead end. I don't know what else to do. What do you suggest?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

can you take a few pictures of the rear left and right sensors and send them to me?

i want to see if they are installed correctly,

well on 1-10 what is your mechanical ability?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

there is a decently prices scan tool on ebay that i recommend to mercedes owners that like doing work on their own,

icarsoft mercedes,

check that out on ebay, can save you hundreds in the long run if not thousands.

Lou

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Customer reply replied 11 months ago
Sent pics of the sensors
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

ok is the car up in the air right now or on the ground and yes i see them thanks for that

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Customer reply replied 11 months ago
I left it up
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

ok, if the car is on jack stands or the doors or hood are opened the compressor will not come on and function fyi,

the rear sensors look good for installation, one thing i see that i dont like is in the second picture you can see a wiring loom in the background that is at a rough 90 degree angle, a lot of the wiring in the back underneath had a protective sleeve that would actually trap water and wear wiring if cocked like that, so it may be best to make sure that loom is not for the sensors.

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Customer reply replied 11 months ago
Ok I straightened out the wires
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago

ok lol, maybe i should have specified, we need to see if that harness does go to the sensor and also try and gently cut back the covering to expose the wires to make sure no wires are broken inside.

its a long shot but it all depends on if that harness goes to the sensors.

I have to go for a bit , I will be back online later.

at this point I know we didnt make much progress, what we really need is a scan tool to get fault codes.

that is where we need to start based on your scenario, so let me know what you want to do from here and i will gladly assist.

I have taken my time to answer your question the best I could and I will continue to help if you need follow up information , all I ask is that you PLEASE take a second to rate my service so I may receive my credit for assisting you, Thank you.
Lou Palomino
Master Mercedes-Benz Tech
Master ASE Certified Tech

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Customer reply replied 11 months ago
It was part of the wiring harness to the sensor. I checked both sides and made sure the wires weren't damaged
Customer reply replied 11 months ago
I'll get the scan tool and hit you up when get it
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 11 months ago
Ok.
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