BurningAMG

Replaced compressor, confirmed no air leaks, replaced relay with Hella, and all fuses. Compressor will not turn on after battery reconnected. Suspension now dropped to lowest.

Am I forgetting a step? I was under the impression I wouldn't need STAR...

Thanks all.

Plutoe

You have been reading all the Airmatic HS at Ben's Wurld----get the car properly diagnosed. Plus you have to remove the faults before the Airmatic will function!!

Max.H

Will icarsoft or star be needed for a simple airmatic pump replacement?

kajtek1

The engine needs to run for compressor to come on.
I never experienced any limp mode on airmatic, even I had some trouble with it.
I mean I have rear air only, but per my observation, with pressure gauge added to the system, on each engine start the system self-check.
So if you have no power to the compressor, you have electric issue.

Plutoe

Any diagnostic tool that can read the airmatic control module will work!

PS: watch out for BS artists that start you on a maypole exercise--they know nothing about the system!!

BurningAMG

Thanks for the responses. The dealer told me today that I didn't need STAR, etc.

Plutoe is telling me clearly I haven't isolated the problem and need diagnostic.

I don't understand what it could be other than another faulty relay?

I've started the car and let it run for a bit, new compressor will not click on. "Too low messages" after about 10-15 secs.

Plutoe

You are spending time in all the wrong places----have the car diagnosed properly and you will quickly define the issue---once diagnosed then you can put on your mechanic hat or else listen to more maypole runarounds.

Let's tell the complete story---what did the dealer say about the diagnostic tool required to remove the faults(you did disconnect the compressor from the system) enabling the system to start----------???

kajtek1

Plutoe is "keyboard mechanic" when he is great is copying pages and seeking info, he has no real life experience.
Even when you scan the car, the error will be
"compressor running time exceeded"
or "compressor electric circuit is not responding"
You should get power to the compressor in the second when engine starts.
Get one of those $2.99 light tester and get on fuse box.
Or you can listen to Plutoe and spend $150 to learn that you have no power to compressor.

Plutoe

see post 7

BurningAMG

Ok - found the issue - it was the passenger foot well 40A fuse (#74). It was blown. Luckily, I found another post that had this info as a check.

So ten more minutes and $4 saved me a ton of time (and money.)

I do find it interesting that neither Indy OR dealer told me to check this fuse. I wonder how many pumps, shocks, relays get replaced when its just a simple fix.

Thanks all, for your contributions. I appreciate the differing opinions and ideas - it is what makes this place truly valuable!

justinp95

Would you happen to have any pics of this fuse box in the passenger foot well?

BurningAMG

I will snap a pic later today and post a summary of my diagnosis.

Thanks!

kajtek1

Partial answer to the question can be here https://mbworld.org/forums/search.php?searchid=17883595
Good to hear you finally found it
Happy motoring

TheTherapist

I replaced my rear shocks with Arnotts when they "apparently" collapsed when launching one time. When we installed them we discovered the shocks were perfectly alright and it was actually the diff mounts which had torn out on the launch. Eh, live and learn - probably should have checked first, assumption is the mother of all f**k ups... Not that it was necessarily a bad thing as that completed the (superior) Arnott suspension all round...

reshad

hello I have the same issue I have changed the compressor. I have changed the valve. I have checked 238 fuse which is at the front for airmatic suspension. Still could not resolve the issue can anyone help?

Rune

I recently had an intermittent bad connection in the plug for the compressor. Checked the relay, and thought I had a dead compressor, until wiggling the connector could bring it back on. Cleaned it a bit, added dielectric grease and tried to improve the pin tension a little, seems to have cured it.

Good luck,
Rune

Luftpost

40 AMP Fuse location.

To test the pump, you can pull the relay and jumper between 30 and 87.

L