dchoran

2006 ML350; Replaced airmatic pump about 9 months ago. Worked great until recently - Quit running and the suspension gradually lost air in the lines. Pulled pump and checked - runs fine on direct 12V battery. Checked relay (works fine - switched with starter motor relay - no problems and put starter relay in airmatic slot - all good). 40A fuse is fine. Checked rear fuse box ( #53 - 5 amp) - all good. Checked 15A fuse front passenger panel - all good. The main connector at the pump has the red wire connector (female connector in the plug) which looks black (instead of metallic like the other one). Did a system scan and got a code "5350 Check component A9/1Y1/ (Airmatic Pressure Release Valve). Where is this part located - on the compressor/integral with the compressor, on the block? Thanks.

BlackML550

Here are all the components to the airmatic system as well as wiring diagrams