Ok, first post on this site. I (my dad) have a first-hand, dealership-bought 2000 LX470 with 113k miles on it, everything is all well and good until we get to a speed bump in the road, if I drive over it going anything above 10 miles per hour, the car bounces HARD and you can hear the front tires scraping the top of the tire bay as the nose dives down off the bump. Anycrap, the AHC system is NOT WORKING. Like, it's non-existent, it's like someone did a really good electrical delete of the system but didn't change any of the actual hardware. We tried using the AHC switch (the one diagonally toward you from the gear selector if you're sitting in driver's seat) and there was no response, the light on the dash was not showing AT ALL (like nothing AHC related was showing on dash) but you could clearly see the provision in the dash for the AHC lights. So we went to the mechanic everyday for literally a week, there was no hydraulic in the front shocks (the hydraulic in the rear was still intact but we bled the system from the globes so that's gone too). We checked all the shocks, the one in the passenger side was leaking and replaced, we checked the AHC pump, it was working fine, of course it wasn't working when connected to the car, but we connected it directly to the battery and it ran, we checked the AHC ECU and it was working, we checked every single fuse in each fuse box, the one in the engine bay, the one at driver's side, and the one at passenger's side, and each fuse was working, and bad ones were replaced. We tried 2 other ECUs and still no response, we checked the AHC switch i talked about earlier, it was working fine, every single damn thing was working as it should. AND YET, when we connected an OOBD-II and ran diagnostics, the computer said there was no AHC present (well it said something along that line, this was back in December 2020) and the mechanic/electrician guy said that according to the code and what the computer said, the AHC system is not even connected to the ECU and it's like the AHC doesn't exist in the car. So my question is, how on God's earth can every single thing be intact and working as it should, and still, the AHC system is not working, the AHC dash light is not working, and the AHC is basically deleted??