The WHT/PK wire is the input. The VT/BK wire is the output. The BK wire in the middle is the ground for the starter relay IIRC. It senses the park or neutral position of the tranny allowing the engine to fire up by providing ground for the starter relay.My Cherokee doesn't have any power going into the nss so my reverse lights don't work anyone have any ideas?
That fuse does power that circuit then it goes through plug C103 pin #1. Pull that fuse and then check the fuse with a multi-meter for continuity. If it is god then check for power into that fuse slot. If power goes in and the fuse is good then power goes out to plug C013 pin 1. So at this point if power is there then it is after this point that your problem exists. I added yet two more diagrams.The fuse for that circuit is #20, 10a in fuse box under dash. That fuse powers other things so you would probably have additional problems if it was blown or had no power ( HVAC, flasher unit,). The switch gets power directly from that fuse so you can ignore other things like shifter, PCM etc, other than a connector or two and maybe a splice or two. If its not a fuse you will have to trace the wiring for an open circuit or loose connection somewhere
When you got the BU lamps to work did you apply power to the INPUT side of the new NSS? If you did then the problem is BEFORE the INPUT side of the NSS switch. No voltage IN....no voltage OUT!So, I just had a brain fart. Once you check for power at the fuse socket and insure the fuse is good, check for continuity between C103 pin #1 and the input wire in the NSS switch. If you have continuity up to that point your problem is after that point. If not then your problem is before that point..... Damn problem has to be somewhere!
Go back to post #13 find plug C103 pull plug. Send 12 volts into pin #1 with the tranny in Reverse. Do you get BU lamps then?Yeah I know that I applied the voltage after the connector and the lights came on so I think it's in the pcm somewhere
To check for input voltage for the TCM you should have used a multi-meter and pulled the fuse for the TCM and see if voltage is on one side of the fuse. To check for voltage by sending voltage through the ground circuit is not good.So I was working on the nss again and I figured I wasn't getting any power to the tcm I applied 12 volts to the tcm fuse (was not thinking) and I am pretty sure I applied the 12 volts to the ground side of the fuse now my jeep won't start at all gauges don't work I don't hear the fuel pump kick in and it just cranks and cranks but doesn't catch do you have any ideas? I am without a vehicle and desperate!