I bought the Slee AHC mod board and have it installed but I have a little issue. It locks the suspension in whatever setting it is regardless. I hooked up the Techstream software and can see that it's not getting speed reading to the AHC ECU regardless of which mode is selected. I spoke to Slee and they sent me a second module and it acts the same. I have quadruple checked the harness and everything is wired correctly. I really want to know what the red/white and red/yellow wire is exactly. Does anyone have a printout of the pinout for the plugs going to AHC computer?
AHC ECU Wiring Diagram
- Thread starter GorData
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These two wires are the wheel speed signals passed through from the ABS ECU. Red/white to pin 4 is front right (FRO) and red/yellow to pin 17 is front left (FLO). Normally these signals tell the AHC ECU that the vehicle is moving and the firmware commands an up or down height signal to get back to N as a function of speed. Remove this signal (by opening the double pole switch) and the AHC ECU doesn’t know the vehicle’s moving and allows it to stay at L or H as if you were parked in your driveway.
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- #3
I did some digging myself and kind of figured out what the cables do but thanks verifying for me. Now do you have any idea what's going on? I don't think two modules could not be working properly. I swapped in a new harness also to rule that out.
There’s a connector/harness behind the combo meter (dash display) that carries those signals so that could be disconnected, did the speed/height control function work previously? Have you put a meter across the poles of the switch and confirmed short/open on both sides as the switch is toggled?
That's the whole point of the Slee override, if I've understood it correctly.
And that's what makes it work.
Looks like you have a perfectly working ahc controller.
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- #6
PADDO - My AHC is working correctly with everything put back to stock. No codes in TechStream.
Correct me if I am wrong but the whole point of the module is to lock the AHC to L/N/H and keep it there when the switch is red and to work like factory when the switch was green. My module stays locked to whatever height in red and green. In Techstream the signal from the speed is not going thru back to the AHC ECU when its green to raise or lower the vehicle.
Let me explain myself a little better, I was posting from my cell phone and wanted to keep to a minimal.
Correct me if I am wrong but the whole point of the module is to lock the AHC to L/N/H and keep it there when the switch is red and to work like factory when the switch was green. My module stays locked to whatever height in red and green. In Techstream the signal from the speed is not going thru back to the AHC ECU when its green to raise or lower the vehicle.
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- #7
Just finished a 20 Mile drive with the module in green (I haven't touched it since midday) and when I parked, I went to lower to L and got nothing but a blink of the light next to the letter real quick. Got a c1776 error for front wheel speed sensor signal under the ahc tab in techstream. Something is up. I am $100 bucks out of two modules because slee Does not warranty electronics. Before anyone ask, I have been working on cars and with harness for years so I have some experience and I had a friend who is a automobile electrician. It's only 6 wires.
Would really like to get it working correctly. Anyone know the part number for a blank for the dash just in case I go back to stock.
Would really like to get it working correctly. Anyone know the part number for a blank for the dash just in case I go back to stock.
Why not ignore the switch completely and properly lift your AHC? 2-2.5" AHC Lift Using King Coils & Shock Spacers
Unless your planning on using the L/N/H modes independently I have never understood this switch. Just a shortcut IMO, your better off adjusting sensors and making sure all your pressures are in spec.
Unless your planning on using the L/N/H modes independently I have never understood this switch. Just a shortcut IMO, your better off adjusting sensors and making sure all your pressures are in spec.
AHC ECU wiring diagram:
AHC removed? Easy 50A fused switched circuit!
AHC removed? Easy 50A fused switched circuit!