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Air suspension issue, has the malfunction suspension light on?

Tiny
BHAMDOC1973
  • MEMBER
  • 2008 MERCEDES BENZ E500
  • V8
  • 4WD
  • AUTOMATIC
  • 146,000 MILES
08 e550 4matic, sits right, not sinking, drives excellent, but has the malfunction suspension light on. Pulled codes and they are below. Am sure they are all corrected. Where would you start?
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Wednesday, September 28th, 2022 AT 10:54 AM

15 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,254 POSTS
Hi,

I tried looking up each code and they weren't listed in my manual. However, I noticed that they all indicate an open circuit. Have you checked for damage to the air-matic control module in the vehicle?

Let me know. Also, I attached the wiring schematic for the circuit, so you have a reference.

Let me know what you find.

Joe
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Wednesday, September 28th, 2022 AT 7:18 PM
Tiny
BHAMDOC1973
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Is the airmatic control module on the passenger side floor?
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Wednesday, September 28th, 2022 AT 7:30 PM
Tiny
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I believe that is correct. I did find a pic of the location and attached it below.

Let me know if this helps.

Joe

See pic below.
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Wednesday, September 28th, 2022 AT 7:57 PM
Tiny
BHAMDOC1973
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Thanks. Hoping to find a wire/connector loose. People are always told to check connections but has anyone ever found a loose connection that fixed everything else? Lool. I know my luck I never find easy solutions to my car problems lol.
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Thursday, September 29th, 2022 AT 5:33 AM
Tiny
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Hi,

I totally understand. It's the same for me. Nothing is ever easy. LOL However, yes, I have found disconnected, loose, corroded, damaged, and so on connectors that caused a failure. It is the best place to at least start.

Let me know what you find.

Joe
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Thursday, September 29th, 2022 AT 6:28 PM
Tiny
BHAMDOC1973
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All good by module. Looked at front sensors on top of strut found that both the air hoses and the electrical connections are off on both struts. They have been replaced by a conversion kit on all. But they did not Add the light fix kit. I know where to buy these. Bit pricey but not as high or a headache as replacing air struts.
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Thursday, September 29th, 2022 AT 6:48 PM
Tiny
JACOBANDNICKOLAS
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Hi,

That would certainly explain the open circuit on everything. LOL Wow, anything to make the day a little more interesting. Regardless, I'm glad you found the issue.

You take care of yourself and please feel free to come back in the future. You are always welcome here.

Joe
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Thursday, September 29th, 2022 AT 7:54 PM
Tiny
BHAMDOC1973
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The module I am sure is what is draining the battery. I disconnected the power wire from whatever it is I had it hooked up to, believe it or not I am having issues finding a power source, everything I test with the probe or test light shows power even when car is off, even the blower motor wires, all hot all the time. Does not make sense.
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Thursday, October 6th, 2022 AT 9:10 AM
Tiny
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Hi,

I can tell you that power to the blower motor is sent via fuse 77. It has power at all times. For the blower motor to turn on, a ground path needs to be provided to complete the circuit.

See pic 1.

Joe
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Thursday, October 6th, 2022 AT 7:42 PM
Tiny
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I am sorry, so it would not work then. Is there a fuse somewhere on the passenger side that I can use?
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Thursday, October 6th, 2022 AT 7:49 PM
Tiny
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Hi,

I'm not sure I understand what you are asking. What won't work? Also, the fuse is a 40-amp fuse. Is it faulty?

Let me know,

Joe
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Thursday, October 6th, 2022 AT 9:01 PM
Tiny
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I am looking for a key on hot wire, so the module does not draw any battery current. I am asking if the blower motor hot wire works, but you said no because it's always hot, so am asking if there are any fuses in this area that I can use, ones that are only on when the car is on.
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Friday, October 7th, 2022 AT 6:02 AM
Tiny
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Hi,

As far as the module is concerned, there are two fuses you need to check. One has power at all times and the other receives power when relay 87 is completed. It's located in the under-hood fuse/relay box.

See the attached pics below.

As far as a switched power supply, under the hood, they basically have power at all times except the aforementioned one requiring relay 87 to be powered.

Let me know if this helps.

Take care,

Joe

See pics below.
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Friday, October 7th, 2022 AT 9:11 PM
Tiny
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Never mind, I needed something that is in the passenger side by these modules, I know I can get power from the trunk or under the hood. I am trying to keep it all under there.
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Saturday, October 8th, 2022 AT 5:52 AM
Tiny
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Hi,

No problem. Let me know if there is anything I can do to help. Also, if you have a chance, let me know how things turn out for you.

Take care,

Joe
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Saturday, October 8th, 2022 AT 9:10 PM

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