I left the sunroof open months ago and got a ton of rain. The height switch hasn't worked since. It wasn't that big of a deal since the terrain selector worked fine and I could do height adjustments with the GAP tool.
But yesterday the compressor stopped running and the suspension is on the bumps. Is there a set of fuses I can pull to reset the system? The compressor has been running fine ever since I rebuilt it a 1.5 years ago.
I ran the GAP tool and got these faults:

I find it hard to understand how all of these height sensors have suddenly failed.
I could have searched out all the answers but my troubles are compounded on each other. Where's a good place to start? The height switch?

 

I've had that fault before, and it would show up and go away by itself with no physical effects showing up with EAS or anything else. I am not convinced that that's your actual problem. If it were me, I would:

1. Change the switch.
2. Check your calibration with the GAP Tool.

 

I reset battery and rescanned the system and found these other faults. Sorry for the size but I don't have time to open up an art program.


Would these faults but the reason why all the height sensors took a crap?

 

Do you have lift rods?

 

No lift rods. This is a daily driver.

 

There is most likely a leak somewhere in the system, but the compressor stopped running. What is the first approach to addressing this? I'm confident that the Hitachi unit is in good shape since i refurbed it a couple of years ago. I think it would make sense to know what controls it and trace it upstream. I will replace the height adjustable switch but I need the compressor to run so that the truck will be operational. We cannot have this vehicle down for long at all.
Thanks in advance.

 

If the system detects a hard fault, it will never fire up. If you want to test the compressor you can jump it or the relay to make sure its operational. I am not sure to what extent you rebuilt the compressor, but my rebuild lasted two years before I ended up replacing it with a new one. I put a new crank shaft bearing, piston sleeve, exhaust seals, etc. Anything plastic/rubber/nylon and movable was replaced.

Clear the faults and maybe see what returns, maybe some are just random errors for some reason. If the faults come back that is your issue. If it multiple faults that don't make sense it could be the control module.

 

My opinion is that a lot of this troubleshooting is folly when you KNOW that the switch is bad and that's going to veil other issues and otherwise hinder your diagnosis. Fix the switch first, see what's left after that...

 

I cleared the faults and the Slow Pressure on the Suspension screen and the Ride Level Control fault returned on the Transfer Case screen (below).
When going into the GAP's Valve Test mode I can hear the pump whirring but it is much more faint. Is it obvious pump that has failed?
Houm_Wa, I do appreciate your advice about fixing the obvious failed part first, but this is our primary family vehicle and any downtime is mission critical. You certainly might have the last laugh since your knowledge and experience with these systems is far greater than mine!

 

Today I ordered a new Hitachi-style compressor online and am picking up a used center console/terrain switch set from a local breaker tomorrow. I'm covering two bases as I must get this thing up and running ASAP. I've had the compressor out a couple of times but wonder how long it will take to swap the console.