DAT240Z Posted April 8, 2007 Share Posted April 8, 2007 I was driving yesterday when the car came to a stop. Got it towed home and checked it out. It's not getting power. from the relay board. I have power going to the board, also have power coming out from the key on 12v source. I checked the pins on the 37pin cable and have 12v key on power but no power from the main 12v wire in the harnes.(white wire) checked the pin on the relay board where the cable connect to and no power is comming from the board. I also check the main power fues and the power there, I check the three relays and I have poerw on three sides of each. I also check the red power wire where it connected to the relay board and there 12v. So I pulled the cable off the ECU. and check for power and all I have is 12v key on power, nothing on the main power from the Battery.Would anyone have an idea what may be going on. P.S. The ECU is not powering up. There is also not signs of the relay board being fried Quote Link to comment Share on other sites More sharing options...
Forrest Posted April 9, 2007 Share Posted April 9, 2007 Sounds like you narrowed it down to the relay itself already. Did you try swapping it out? Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted April 9, 2007 Author Share Posted April 9, 2007 I don't have a spare before I order a new I thought to post just in case someone may have had the same issue and could point my in the right direction Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted April 9, 2007 Share Posted April 9, 2007 Keep us posted. If it's a relay, that would be a pretty easy spare to add to the "carry-around-spares" list. Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted April 15, 2007 Author Share Posted April 15, 2007 Well I just install my new relay board, still have the same problem. No power the EUC is not powering up. Quote Link to comment Share on other sites More sharing options...
olie05 Posted April 16, 2007 Share Posted April 16, 2007 It doesn't matter if you are getting power if you don't have a ground. Check to make sure the groun for the relay board is still making contact with a grounding source. Quote Link to comment Share on other sites More sharing options...
DAT240Z Posted April 16, 2007 Author Share Posted April 16, 2007 I have always had the ground at the battery, I just check and it getting good ground as the relay click on and off when remove and replace the ground at the battery. Quote Link to comment Share on other sites More sharing options...
JSM Posted April 19, 2007 Share Posted April 19, 2007 Can you bypass the whole relay system and hook positive juice up to the ECU just to make sure that isn't bad? That would at least eliminate the ECU being bad no? Quote Link to comment Share on other sites More sharing options...
Forrest Posted April 23, 2007 Share Posted April 23, 2007 Well I just install my new relay board, still have the same problem. No power the EUC is not powering up. Whoa there, you replaced the entire relay board? I just said "relay", those are a 2$ part. I doubt anything was wrong with your board. Did you check for 12v at the pinout of the relay board when the switched power and main power were both hooked up? If so, check your relay cable. Is your relay cable using at least 20g wires? Quote Link to comment Share on other sites More sharing options...
mobythevan Posted April 23, 2007 Share Posted April 23, 2007 Yeah, it seems like its time to open the MS case and see if power makes it in to the voltage regulator. You'll have to look at the schematics and figure out which pin to probe. The follow back to the DB37 connector and then back across the cable to the relay board. Just have to check everything, I said check not replace Quote Link to comment Share on other sites More sharing options...
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