Chris Glagola Posted June 26, 2020 Report Share Posted June 26, 2020 Hello, I am having an issue with the input for launch control. I am using the plug & play galant vr4 ecu in a 92 plymouth laser. I believe my clutch switch is bad so I'm in the process of hunting one down to install but I'm not sure on how to wire it to the ecu. I see digital input #6 on the expansion loom is not used but do I wire the positive or the ground on the switch to the input? Ive tried setting up launch control based on mph using Digital input #3 (speed reference on the ecu) but for some reason it still arms the system at 20mph+ versus disarming after 10mph. Thank you Quote Link to comment Share on other sites More sharing options...
dx4picco Posted June 26, 2020 Report Share Posted June 26, 2020 Put one side of the switch on a chassis ground and the other side on your DI pin Quote Link to comment Share on other sites More sharing options...
Chris Glagola Posted June 26, 2020 Author Report Share Posted June 26, 2020 6 minutes ago, dx4picco said: Put one side of the switch on a chassis ground and the other side on your DI pin If I do this but leave the original ground for the switch untouched, shouldn't it technically be grounded through the stock harness already? Since there's a power and ground going to the switch from the factory. Quote Link to comment Share on other sites More sharing options...
dx4picco Posted June 26, 2020 Report Share Posted June 26, 2020 I don't know how your car is wired. I mentioned chassis ground because it is most of the time the simplest to get to. but any ground should be ok Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 26, 2020 Report Share Posted June 26, 2020 The DI's can be switched to ground or to positive, they can be set up to work either way. So you should be able to just connect it up to the stock wiring and it will work. Chris Glagola 1 Quote Link to comment Share on other sites More sharing options...
Chris Glagola Posted June 26, 2020 Author Report Share Posted June 26, 2020 1 hour ago, Adamw said: The DI's can be switched to ground or to positive, they can be set up to work either way. So you should be able to just connect it up to the stock wiring and it will work. Sweet thanks, probably just a bad switch then. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 27, 2020 Report Share Posted June 27, 2020 8 hours ago, Chris Glagola said: Sweet thanks, probably just a bad switch then. You may also need to turn on the pull-up in the DI settings depending on how the circuit works Quote Link to comment Share on other sites More sharing options...
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