turbo8
Supporting Vendor
To get to the AHC ECU, you will need to remove a 14mm seatbelt bolt and a 10mm bolt from the plastic step plate. Everything else is held together by plastic snaps. It was easier to get to than I was expecting.
My LC 200 lifted and AHC problems
- Thread starter Wotan
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- #22
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- #23
Bad news for me. I' ve done the AHC ECU detachment procedure described by Turbo8 , I disconnected the AHC fuse in the engine compartment and two under the passenger side. Then I disconnected the rear AHC ECU. When I turned on the car the leveling-headlights error light immeditatly flashed as shown in the picture. At this point I am afraid that my control unit ( L C 2014 model ) may not be completely the same as the Lexus one and I am afraid what else may become unhappy removing it . I will go ahead with my suspension mod project and I will keep you updated on what happens. Anyway thank you Turbo for the infos but I don't trust myself to follow this way.
turbo8
Supporting Vendor
My AFS didn't function either when the AHC ECU was detached. My light didn't come on though.
I was also going to mess around with the AHC ECU and see what each connector does. Maybe 1 for AHC, 1 for AVS, and 1 for AFS.
Guess it is worth a shot.
I was also going to mess around with the AHC ECU and see what each connector does. Maybe 1 for AHC, 1 for AVS, and 1 for AFS.
Guess it is worth a shot.
Fascinating.
Here's the other communication points on the Suspension Control ECU portion of the CAN-BUS.
DTCs in the troubleshooting section
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- #28
Lexus Model Range I’ m pretty sure that they simply raised original suspensions keeping AHC working to get new quotes ( maybe new springs) . I’ ve send them some mails but no answer....
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- #29
Well guys, this is the situation. I‘ ve got the answer from official Toyota channels that a slight clicking noise is normal from the AHC system when is working. The problem is that my noise had become very frequent and so I was worried. The premise is that my car has the AHC locked and I raised it with aftermarket suspension for 35 tires. Since 3 years everything worked great (crawl control etc) the problem was this noise that in those last time was almost continuous. I’ ve made a deep reset of the car system by a mechanic who had a serious Toyota program (two dealers had done the same thing without results) and he found tons of conflicts and errors in the system. He has reset everything and now the car don’ t makes any noise.
Thanks for posting back. So basically he reset several ecus back to initial state ? And then they renegotiated communication and all was well? Do you know which ecus?
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- #31
He connected the PC to the socket under the steering wheels so I desume it has to be the principal ECU of the car. That was your question ?
Sure. Yes the obd2 can see all the computers. There are a bunch . . . No worries techstream can we al the computers so if I need to I’ll look for resets by eco in there.
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