2008 Z55 autoride suspension control module

[dbtractor]

So this vehicle I put new rear shocks. front struts, and a new compressor on a couple months ago. Everything was working fine then a couple days ago I noticed the battery dead so I did a parasitic draw test. I measured a .5 amp draw and narrowed it down to 30 amp fuse #2 which powers the suspension control module and the air exhaust solenoid. I found that by removing the fuse my draw went down to .01 amps which is much better. When installing the fuse the solenoid clicked so the exhaust solenoid is getting a constant ground from the control module. I also noticed the compressor is not kicking on anymore. But I have no faults on the dash. I do not have a scan tool to check the faults.

I got access to the module and then checked power, grounds, and can communication. Load test powers and grounds. have good can communication. Also load tested ignition wake up and all that was good. Checked if there was a short in the solenoid control wire and there was not. I measured from the control pin on the module to the main ground pin and had 0 ohms so the module is constantly providing a ground to the solenoid even when completely unplugged. I also grounded the compressor relay control wire at the module connector and the compressor kicked on which verifies that all the compressor wiring and relay is good. At this point I'm suspecting a bad module. I heard there is a reset procedure or something, not sure if that would fix it. And I also don't know if I should have someone with a scan tool see if there are any codes because it doesn't have a fault on the dash.

 

[Joseph Garcia]

Buy/borrow/steal a quality bi-directional scanner, and you can troubleshoot the control module. Also, keep in mind that not all trouble codes generated are visible on the dashboard, but a quality bi-directional scanner can access the these hidden trouble codes. It does sound to me like there's an issue with the control module, given what you've stated above.

Yes, a replacement control module needs to be programmed to your truck's VIN.

 

[dbtractor]

So if I got a used module off of another vehicle would the vin mismatch cause an issue? Or could I reprogram it to match the vin?

 

[Joseph Garcia]

So if I got a used module off of another vehicle would the vin mismatch cause an issue? Or could I reprogram it to match the vin?

You can re-program it to your truck's VIN with a quality bi-directional scanner.

 

[petethepug]

Gen 3 (07-14) full size SUV GM had not implemented the global B architecture for its modules yet. That occurred in 2015+ to protect the techy items like supercruise and over the air SW updates.

Any used module can pretty much be swapped from one vehicle to another, except of course high theft or fraud preventing items like odometers and radio/Navi.

If it’s brand spank’n new it’ll need to be programmed. Purchased off eBay from a wrecker, it’s plug n play as far as suspension modules go.

https://static.nhtsa.gov/odi/tsbs/2018/MC-10129857-9999.pdf

 

[dbtractor]

I still dont understand why there is continuity between pin 8 and pin 47 with the module completely unplugged. Since the exhaust solenoid has constant battery power this is what drains the battery because those 2 terminals have continuity all the time. And the air shocks won't build pressure like that even if the compressor runs.