AHC Help with Diagnosis (1 Viewer)

[Cobbs]

2006 LX470. AHC seems to work, it will go into H and back into N but won't stay. It even reverts during the same trip. If I stop for 5 minutes it's back in N.

I know, there are a ton of threads on AHC but I don't have time to sift through them all to find answers.

This is my first 100 and first time having "issues" I just never used it before but know want to know what's happening. Am I missing something simple I hope?

Truck has been impeccably maintained, up to date on everything. 126K miles. You would assume all to be fine...

 

[jLB]

Are you aware that by default, the AHC will return to "N" when the vehicle reaches a certain speed, and is that what you are experiencing?

 

[Biga27110]

2006 LX470. AHC seems to work, it will go into H and back into N but won't stay. It even reverts during the same trip. If I stop for 5 minutes it's back in N.

I know, there are a ton of threads on AHC but I don't have time to sift through them all to find answers.

This is my first 100 and first time have "issues" I just never used it before but know want to know what's happening. Am I missing something simple I hope?

Truck has been impeccably maintained, up to date on everything. 126K miles. You would assume all to be fine...

Your assumption is correct everything is fine.

 

[Cobbs]

Are you aware that by default, the AHC will return to "N" when the vehicle reaches a certain speed, and is that what you are experiencing?

I was not aware of that...I thought it would stay in H. Yes it goes to back to N during short 5 minute trips. It also is back in N after a 2 minute stop to grab something... thanks. Pardon my ignorance.

 

[Cobbs]

Your assumption is correct everything is fine.

Thanks. Just for clarification, how long should it stay in H? Seems to stay there after shutting off truck but back in N after start. NO way to override and remaining in H? Thanks for the insight.

 

[Biga27110]

Thanks. Just for clarification, how long should it stay in H? Seems to stay there after shutting off truck but back in N after start. NO way to override and remaining in H? Thanks for the insight.

The car defaults to N after something like 25mph. If you are under that it will stay in H or L depending on what you have selected. There is a product that a vendor sells which locks the car in the mode you want. I think it was Slee I dont remember.

Edit: If your foot stays on the brake for longer than something like 30 seconds the system pauses.

 

[jLB]

A description of AHC starting at page 130 of this document:

https://drivers.lexus.com/t3Portal/document/om-s/OM60C81U/pdf/OM60C81U.pdf

Slee AHC Controller:

Slee - Electrical Switches

Specialist in Toyota 80 Series Land Cruisers. Hard to find parts, off-road accessories and custom fabrication

www.sleeoffroad.com