GX470 KDSS bypass (1 Viewer)
- Thread starter Jstawgn
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- Thread starter
- #2
The stabilizer ECU location is back drivers side corner.
I can disconnect S34 connector and disable the KDSS from closing the solenoid valve. This is the black most forward connector.
This connector connect to solenoid and accumulator pressure sensor. Disconnecting one wire and route it to normally closed relay would disable KDSS temporarily.
I can disconnect S34 connector and disable the KDSS from closing the solenoid valve. This is the black most forward connector.
This connector connect to solenoid and accumulator pressure sensor. Disconnecting one wire and route it to normally closed relay would disable KDSS temporarily.
I was all stoked for getting a disconnect, but I worry that the system was not intended to be cycling all the time. I think it could be overheated.
- Thread starter
- #4
It is possible to overheat. I think that is the main reason why KDSS is not available on TRD Pro 4Runner. Most people does not really drive for hours at high speed off road as this is nor really a Baja racer and its fine for that short distance.
I really haven't got any real use for this where I wheel my GX In the midwest. I was doing this investigation just out of curiosity.
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Which wire color are you talking about disconnecting on that connector?
- Thread starter
- #6
EDIT:Solenoid power would be better.
Pink with Green stripe and Light Green is the one for solenoid power.
Violet, Black and Green is for pressure sensor. Disabling either one will cause KDSS to default to off position and turn on the light. The concern is this sensor are 0-5 volt analog signal. Messing with power or ground might be OK but adding length of cable to the analog signal would make the sensor reading a bit different.
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Both vendors of bypass on 460 claim they are not aware of any overheat issues.
- Thread starter
- #8
Found a relay module that would make this very easy to wire.
Require one momentary switch to activate and I believe it would automatically revert back to stock when power is removed.
czh-labs.com
Require one momentary switch to activate and I believe it would automatically revert back to stock when power is removed.
Panel Mount Momentary-Switch/Pulse-Signal Control Latching DPDT Relay Module,12V.
CZH-LABS Panel Mount Momentary-Switch/Pulse-Signal Control Latching DPDT Relay Module,12V.
czh-labs.com
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- Thread starter
- #9
Finally got all the parts. Using latch relay really simplify the install.
Choose to use simple discrete momentary button as I cannot find any Toyota standard push button that got somewhat related KDSS symbol.
Parts list.
1. Latching relay. 12VDC Panel Mount Momentary-Switch/Pulse-Signal Control Latching Relay | eBay - https://www.ebay.com/itm/12VDC-Panel-Mount-Momentary-Switch-Pulse-Signal-Control-Latching-Relay-/284183271792?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
2. 25ft of 18 ga / 4 conductor security wire from home depot
3. Fuse tap
4. 2 amp fuse
5. misc wire terminal
6. Any momentary push button
7. 3X2 small radio shack project box to enclose the relay.
The relay really makes this very easy job. And the 4 wire conductor makes the color coding easy and no need for custom harness.
Wiring:
1. The green solenoid wire was cut near the stabilizer ECU and one end put to NC1 and the other to C1
2. Pink and green solenoid wire was cut and one end goes to NC2 and the other to C2
3. VCC terminal of the relay wire to fuse box using fuse tap. I use one of the power window circuit.
4. GND is to any grounding point
5. The other GND and R/S wired to the momentary switch.
Choose to use simple discrete momentary button as I cannot find any Toyota standard push button that got somewhat related KDSS symbol.
Parts list.
1. Latching relay. 12VDC Panel Mount Momentary-Switch/Pulse-Signal Control Latching Relay | eBay - https://www.ebay.com/itm/12VDC-Panel-Mount-Momentary-Switch-Pulse-Signal-Control-Latching-Relay-/284183271792?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0
2. 25ft of 18 ga / 4 conductor security wire from home depot
Southwire By-the-Foot 18/4 Gray Stranded CU CL3R Shielded Security Cable 57573099
Ideal for fire alarms, security systems and data communications, this Southwire Gray 18/4 CL3R Security Wire is applicable in indoor or outdoor locations. Can be used in either dry or damp environments.
www.homedepot.com
4. 2 amp fuse
5. misc wire terminal
6. Any momentary push button
7. 3X2 small radio shack project box to enclose the relay.
The relay really makes this very easy job. And the 4 wire conductor makes the color coding easy and no need for custom harness.
Wiring:
1. The green solenoid wire was cut near the stabilizer ECU and one end put to NC1 and the other to C1
2. Pink and green solenoid wire was cut and one end goes to NC2 and the other to C2
3. VCC terminal of the relay wire to fuse box using fuse tap. I use one of the power window circuit.
4. GND is to any grounding point
5. The other GND and R/S wired to the momentary switch.
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How has this been working? Am I reading correctly that you cut in at the rear of the vehicle and ran only the dash switch up to the front? There are toyota momentary switches you can use now. You can buy them blank or add a custom logo at ch4x4
Everything still working fine for the disconnect? Does it only allow kdss at the slightly higher speeds of 20-25? Then lock out at highway speeds or is it a total on off situation?
These bypass solutions remove all logic from KDSS... if it is off.. it is off for all speeds
- Thread starter
- #12
Been working really good.
Any momentary switch will work with this latch relay.
Speed dependent activation is totally irrelevant once the relay energized.
I see you got 20 ft of wire, was that to run the spliced wires up to the relay under the driver dash and have a short power tap to it, or did you mount the relay in the rear and run power all the way to the fuse box and switch up front?
Did you feed it through the sills under the carpet?
- Thread starter
- #14
Get a bit more. Maybe 25' I have to get more cable to complete it.
Yes just put it thru the door sils.
The relay got Velcroed inside the rear trim panel close to the KDSS ECU.
That's what I figured, the long momentary switch wire shouldn't matter as much as a long power source wire may. I do have thicker power wires but prefer a shorter run than from the fusebox to the rear.
You tapped rear power window wire near that location on the 4R?
I'll have to find a switched power wire to tap in the rear on the gx.
- Thread starter
- #16
Power is only needed to power the relay. It takes very small power to activate it. I think I use 3 amp fuse. I run it to the fuse box on the left of driver's side kick panel. That 4 wire cable is what I use. I use a fuse tap to one of the circuit that is on only when ignition is on. Maybe the seat heater. Don't remember anymore.
Having an issue with the switch, I got everything wired up as above but I’m getting nothing to the switch. Any troubleshooting tips?
- Thread starter
- #20
The switch are just dry contact. It just need to make a momentary contact to signal the relay to close. I also found you need to hold the switch a bit longer like 1 sec to activate it.
The relay module need power and ground. Which circuit did you the power from? Since I am using a 4 wire cable, mine are grounded close to the fuse box.
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