Airbags not inflating?

[GUS2000]

What was the final outcome of this one?? enquiring minds want to know

 

[Rustycoach]

I never looked into it once I knew the source. It seems to be intermittent and has never failed to adjust to ride height.

 

[SteveMA]

Had a total Electronic Ride Height (ERH) rear leveling system failure about 3 weeks ago on our 2020 Mountain Aire with Valid air leveling. Happened when I was coming off the freeway and turning at the traffic light - Valid FAULT alarm went off with an error code of "no communication to Rear Control Module". Once I put the HWH jacks down (and dumped the airbags) I was dead in the water as the airbags would not refill for any reason. Spoke to Valid, did a bunch of tests and a hint they gave me solved the issue (at least I can air up the suspension) - They said "failure rate on the ERH controllers is near zero - check the voltage at the connector on the ERH Controller plug..."

Result and fix - Rear Freightliner PDM failure for the 2nd time (Eaton PDM) - Our PDM was replaced when the TOAD lights and AC clutch became intermittent about 18 months ago. When I discovered there was no +12V on the line that powers the Valid Rear Control Module for the ERH system at the connector to the Rear Control Module and then also confirmed no +12v at the connector at the PDM, I did a temp 12v connection to the wire that supplies +12V to the Rear Control Module and ... the system came right back to life. Installed an inline fuse for now with power to the ERH controller and all good.

In my research I found that the fuse for the rear ERH was good, and showed +12V on both sides, also replaced the fuse for certainty, however from there it did not get to the connector and into the wiring harness up to the ERH. The fuse is directly above the area of the PDM that failed due to micro cracks in the solder/PCB for the Toad lights AC clutch etc, which makes it highly likely it is a related failure (like 98%) - this will turn out to be a crack in the PCB of the PDM (again).

I have now heard about multiple cases where the replacement PDM has failed - a 2nd and even 3rd time. I am reaching out to FCCC service to start the process...

May not be related to your issue, but I suspect the failure on our coach will not be the only or last one.