DIY 718 PSE SWITCH

[Tom]

Awesome thanks Tom! I’ll likely try a wireless version of this or a mounted switch somewhere. I’ll get with you when I finally get around to it!

Awesome. The world needs a 3D-printer-enabled 718 owner to design a switch plate for this that plugs into one of the factory blanks! A finished looking switch in the center stack would be my first choice over a switch on the end of the cable, or even a separate remote fob for that matter.

[JetFuelOnly]

I’m wondering which of those remote setups will be compatible with the built in garage door switches?

[Lott678]

Is there a YouTube video comparing the three selections?

[fjord384]

This is great! After reading the instructions, from my understanding:

1. Wire the switch directly to the valve solenoid in the engine as well as to the factory harness.
2. Feed the switch through the firewall (is there an existing hole that can be used?)
3. Hook the 12 v source using a fuse tap
3. Mount the switch anywhere you want inside the cabin.

[Tom]

This is great! After reading the instructions, from my understanding:

1. Wire the switch directly to the valve solenoid in the engine as well as to the factory harness.
2. Feed the switch through the firewall (is there an existing hole that can be used?)
3. Hook the 12 v source using a fuse tap
3. Mount the switch anywhere you want inside the cabin.

That's it in a nutshell. You remove the factory connector from the solenoid, and then plug this harness onto the solenoid, and into the now-removed factory connector. This intercepts the control signal going to the solenoid and allows you to substitute 12v (to shut the valve); or no power (open the valves); or feed the original factory signal back to the solenoid (for factory functionality). The original post includes a Jeopardy-buzzer holder for the switch, but you can certainly mount it anywhere you want. See the Track Nanny installation instructions I linked for routing the wires...

[freaknbigpanda]

Very cool! Definitely going to try this out soon. Thanks for making this available publicly!

[freaknbigpanda]

Hey Tom,

We talked briefly via email and you mentioned that for the 981 this would need to use JPT connectors instead of the ones listed in the 718 pdf guide. I think I found the right part numbers, can you confirm if my selections below are correct?

Male connector:

https://www.digikey.com/en/products/det ... -1/2054000

Pins x2: https://www.digikey.com/en/products/det ... -1/2331847

Female connector:

https://www.digikey.com/en/products/det ... 9-1/744836

Pins x2: https://www.digikey.com/en/products/det ... -1/1840592

And then everything else is the same right? Looking forward to getting started on this project!

[Tom]

Those are the right connectors and pins -- good work! There are multiple options for the connector with female terminals, but the one you picked is great. The only thing I'd add is that the ground pass-through wire is Pin 2 on the 981 (i.e., you will connect pin 2 of the two connectors together with a wire). From the factory, Pin 2 is always grounded, and the PSE control signal from the ECU goes to the solenoid Pin 1, so Pin 1 is the one you want to intercept with the switch on the 981. (It's the opposite on the 718 and 991). You can see the pin numbers on the connector below.

jpt pins.jpeg

[freaknbigpanda]

Here is my work:

IMG_7003.jpeg

IMG_7002.jpeg

IMG_7001.jpeg

going to try it out tomorrow or Wednesday. Fingers crossed it works!

[freaknbigpanda]

This is only tangentially related but does anybody know what the following connector is on my 981? It looks like it is just terminated, mot connected to anything which is curious.

IMG_6995.jpeg

IMG_6996.jpeg