LX 570 Easy access AHC (1 Viewer)

[Lou Gill]

So what is the consensus on leaving the easy access on all the time? I turn it on for my 91 year old mother-in-law and my 85 year old mother, but to be honest it makes getting in and out of the truck really easy! Does it effect the AHC longevity???

 

[HGB]

So what is the consensus on leaving the easy access on all the time? I turn it on for my 91 year old mother-in-law and my 85 year old mother, but to be honest it makes getting in and out of the truck really easy! Does it effect the AHC longevity???

From what I was told, it is good to exercise the system.

Further ‘evidence’ would be that the system adjusts nearly constantly while driving (and sometimes parked) regardless, so it’s never actually not in use.

 

[slipkid13]

I can't imagine they would offer a feature like that if it reduced AHC reliability. Plus, what HGB said, the system is constantly adjusting while drive.
I love the easy access feature and have it on all the time.

 

[grinchy]

Does no harm. enjoy the perks of height control.

 

[Lou Gill]

Perfect, turned on for good!!! Thanks to respondents!

 

[TeCKis300]

I really enjoy the kneeling function. It starts to really earn its keep when lifting the LX with larger tires and sensor lift. A inch here, and inch there, and all of a sudden it's not as comfortable to hop in and out of the car anymore. I can deal, but the wife, kids, and grandparents would suffer. It's such a great thing when loading heavy things in the trunk too.

Wouldn't seem those minor inches make such a difference at first.

 

[tbisaacs]

I do wish the 570 had a manual kneel option like a Range Rover - they have a button in the rear to drop the car. I realize air and hydraulic aren't the same - still wish I had it though.

 

[Bryanmc]

Figured I’d ask here. My Easy Access feature has stopped working. I flushed my AHC fluid this weekend and all seems fine after that but the Easy Access won’t work.

Now, I can’t say for 100% certain that it worked right up until I flushed the fluid, but I do use it pretty regularly so it had been working within a week of doing the flush. Maybe it’s a coincidence.

I’ve tried searching here and other places but can’t find anything about how to even troubleshoot this. It’s not the biggest deal in the world, I just don’t like it when things don’t work.

Anyone have any thoughts?

 

[NYC570]

Figured I’d ask here. My Easy Access feature has stopped working. I flushed my AHC fluid this weekend and all seems fine after that but the Easy Access won’t work.

Now, I can’t say for 100% certain that it worked right up until I flushed the fluid, but I do use it pretty regularly so it had been working within a week of doing the flush. Maybe it’s a coincidence.

I’ve tried searching here and other places but can’t find anything about how to even troubleshoot this. It’s not the biggest deal in the world, I just don’t like it when things don’t work.

Anyone have any thoughts?

Mine is pretty slow and inconsistent so I like to lower it manually. The system doesn't lower until a few scenarios are met, but even then, sometimes it lowers and sometimes it doesn't. Usually when I get to a destination people open their doors way before the system has a chance to do anything so i just lower it manually when I'm slowing down to below 7mph.

 

[grinchy]

If you can access low mode manually then you aren’t meeting the other conditions.

 

[Bryanmc]

If you can access low mode manually then you aren’t meeting the other conditions.

Yeah, but as far as I can tell I am. I’ve been over the list of conditions several times.

In my 4Runner there was something weird you had to do if you ever disconnected the battery to “reset” the windows in order to be able to roll down the rear window. I wonder if there’s something like that at play here, where the vehicle thinks a condition isn’t being met and needs to be reset. But I can’t find anything like that.

Is there a module or a sensor that controls the Easy Access lowering? Anything that could have gone bad?

 

[GordJ]

Obviously the button is pushed?

 

[Bryanmc]

Yeah, the button is pushed.

I don’t know if this is related but I ran a Carista scan and pulled this code (no dash warning lights):

C1733 RR Damping Force Control Actuator Circuit

Off to Google!

 

[lx200inAR]

Yeah, the button is pushed.

I don’t know if this is related but I ran a Carista scan and pulled this code (no dash warning lights):

C1733 RR Damping Force Control Actuator Circuit

Off to Google!

I wonder if the AVS aspect of your system is working at all...


Detection Condition:
When either of the following is detected:
- An actuator open-circuit signal is detected for at least 1 second when the actuator operates.
- An actuator short-circuit signal is consecutively detected 8 times when the actuator operates.

Trouble Area:
- Harness or connector
- Rear shock absorber control valve RH (Rear damping force control actuator RH)
- Suspension control ECU

 

[Bryanmc]

I’m afraid this troubleshooting might be beyond me…

 

[lx200inAR]

I’m afraid this troubleshooting might be beyond me…

Might try to clear the DTC and see if comes back.

First thing I'd do is find the actuator. The round suspension globe will be attached to it (Rear Passenger side on USA truck). There should be a plug going to it. I'd check that plug, make sure it's connected and doesn't look damaged. Trace back any cabling from it that is easily visible and make sure no cuts. The thing in the picture below will be attached to outside of the frame under the rear passenger door. The white connector on the far right side is what you are checking.

Then I'd clear the alert with your OBDII tool and see if it goes away. If you luck out and that fixes it then great. Otherwise you will need a multimeter and probes.

 

[Bryanmc]

Thanks. I did clear it and it came back. I checked the plugs of all the globes and all seemed to be ok. I’ll pull the cover off the actuator tonight and see how that connection looks.

Are there any electronics back near the reservoir? I bumped around quite a bit in there with all the hoses and filling.

 

[Bryanmc]

Got my terminology mixed up, checked all the actuator plugs and pulled the cover off the accumulator but didn’t really know if the harness connector I was looking at was part of it or not.

All looked fine visually. If the code is accurate I’ll focus on the right rear actuator. I’ve got a multimeter but haven’t ever diagnosed car electrical issues, so time to get up to speed on that.

 

[supercarrera]

Yeah, the button is pushed.

I don’t know if this is related but I ran a Carista scan and pulled this code (no dash warning lights):

C1733 RR Damping Force Control Actuator Circuit

Off to Google!

I had a similar code and it turned out to be the electrical connector on the actuator that was damaged. There is a troubleshooting procedure in the FSM that basically checks the wires from the AHC cpu to the actuator. It also checks the internal resistance of the actuator itself.

 

[lx200inAR]

Pin 2 in the connector on the right is ground. First thing I’d check if everything looks okay is that there is continuity between the wire side of the connector and the truck. If not, then trace that back to wherever it’s tied to the frame.

The FSM expects you to test the wiring between the actuator and the suspension ECU first, then test the cabling and the actuator. But, if it was me I’d test the actuator first, since it’s probably easier. Once it’s unplugged, test resistance between each of the 4 pins and pin 2. The FSM says 12-16 ohm I believe. If that checks okay, then you’ll have to check the wiring between the suspension ECU and the actuator. You want to check for continuity between each wire end and for none to ground on any of the wires. This will guarantee no shorts or breaks.