ajslacker Posted May 24, 2022 Share Posted May 24, 2022 I've got a cruise control question for anybody that can help. I've got a 90 Legacy that I manual swapped last year and am now installing cruise control. Everything is hooked up per the directions on surrealmirage. My problem is that when I hit the cruise button the relays and orange cruise light will turn on but when i let go both instantly turn off. Cruise control doesn't work at all yet. Both relays are clicking including the re-pinned clutch switch. Brake lamp switch is a brand new 4 pin. Not sure what I did wrong. Any help appreciated. Quote Link to comment Share on other sites More sharing options...
lmdew Posted May 24, 2022 Share Posted May 24, 2022 Every circuit has a Load, gound and Power. Find the Load Find Ground Find Power Sounds like a circuit issue to me. Check out Loadpro if you like. Quote Link to comment Share on other sites More sharing options...
el_freddo Posted May 24, 2022 Share Posted May 24, 2022 Could also be a difference in the control unit. You might find the auto uses a different unit to the manual. Cheers Bennie Quote Link to comment Share on other sites More sharing options...
ajslacker Posted May 24, 2022 Author Share Posted May 24, 2022 23 minutes ago, el_freddo said: Could also be a difference in the control unit. You might find the auto uses a different unit to the manual. Cheers Bennie They are different units but with a little bit of wire de-pinning and re-pinning you can get them to work with each other as long as you have the correct relays. Which I do. Quote Link to comment Share on other sites More sharing options...
wtdash Posted May 30, 2022 Share Posted May 30, 2022 This may not help, but I did this (10 years ago) on my '90, too. HOWEVER, mine was turbocharged and the '91-'94 turbo ECU works for both manual and Autos...not sure if that's the case with the NA/non-turbo ECU. LegacyCentral should have that info. I also followed JC's info, did NOT install the inhibitor (?) switch (keeps from starting in gear), and swapped in a manual CC computer. Worked OK when finished. Quote Link to comment Share on other sites More sharing options...
ajslacker Posted May 30, 2022 Author Share Posted May 30, 2022 If anybody is interested I did fix it. I bought an auto CC computer off of ebay and plugged it up. If you just clip one of the 4 wires that goes into the auto relay (black and red wire) it works. The only thing is it of course doesn't disengage when you hit the clutch, but personally I only use it on long trips so I'm not to worried about it. Not sure if my manual computer was bad or If I wired it up wrong, but in my opinion it's easier just to use the computer that matches the factory harness of your car. 1 Quote Link to comment Share on other sites More sharing options...
lmdew Posted May 31, 2022 Share Posted May 31, 2022 Nice. You could alway wire power throught the clutch switch. If you open it, it will cut the CC. Quote Link to comment Share on other sites More sharing options...
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