rich30769

Hello forum family, has anyone here ever had to change their Airmatic control module? Let me explain what I'm experiencing. A few weeks ago I keep receiving the dreaded compressor malfunction symbol on the dash but, the compressor and my system was acting normal other than that warning. A week later I noticed that every now and then after the truck sat for a few hours all 4 corners would drop. Also, I couldn't switch from sport, to comfort, or to automatic, nor could I raise the truck with the button on the dash. In order for me to get any of those functions to work I had to turn the truck off and restart it and then the compressor would run for a long time. I also noticed a slight leak from the valve block via the soapy water test so, I removed the valve block, tightened all fittings, reinstalled the compressor and nothing. No sound whatsoever. I figured the compressor was toast. Ordered a new compressor, installed the new relay along with the new compressor and still nothing, no noise from the compressor as if it's not getting any power. Checked both fuses and they are fine. Spoke to someone who experience with Mercedes and he said it sounds like the control module is faulty.

Has anyone ever encountered this issue before so, it's a 2009 GL550 with 106k miles.

As always,

TIA

gl450x164

Try replacing f4kn relay in right rear compartment

rich30769

Will replace it tomorrow and see what happens.

Thanks

rich30769

Is the F4kn relay the one directly under the grey relay to the upper right?

gl450x164

Its one of the grey ones drawing a blank on which one at the moment

rich30769

Ok thanks

rich30769

Switched the 2 grey relays around, changed the air suspension control module and still no power. Quick question, when installing a new control module, does that module need to be calibrated, or formatted to that specific truck?
The code that I'm getting is: 5557 No CAN message is received from the control module 'N51 (AIRmaticwith Adaptive Damping System (ADS) control module.

gl450x164

You cant just install a new or used module. It needs to be programmed with star/das

rich30769

perfect, that's the answer I was looking for. Thanks once again.