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R32 manual box reverse light wiring.

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Reverse light are not even hooked up at the gearbox connector, and I don’t see any wiring at all,that indicate they could be for reverse light.  Which could have been deleted from previous owner. 
 Researching through online, Figured out the reverse light wiring is part of this unwrapped harness in the photo. 
Does anyone know which one are they ?

Also once I know the wires how should I proceed connecting them to the box ?



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Yea man tried looking into it, couldn’t figure out still. Only transmission wiring I found in that manual is the neutral switch and speedo.

If you know the page no. For whole transmission wiring, that be great. 
Still don’t think it’be same for 20det box

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1 hour ago, Rb25orange said:

Still don’t think it’be same for 20det box

The 20DET RWD box and the 26/20DET AWD box both have a reverse switch. The reverse switch wiring will definitely be on the diagram. I'm 2000km away from my copy of the manual, so can't easily look for you. Keep looking.

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One is neutral, the other is reverse. You can actually work out which is which for yourself by probing them. One will be closed (short circuit) in neutral.....the other in reverse.

FWIW, on the small l box, I think the frontmost one is reverse and neutral is the rear one.

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Posted (edited)

OK, so, I downloaded the R32 GTR manual that's up on NicoClub's site. On the 3rd page of wiring diagrams (the last pages of the PDF), which I show here zoomed out for identification purposes


Right in the middle is the reverse lamps and the reverse switch (for MT vehicles)) is shown right there, just above it. I've zoomed it in and circled the area of interest, here


The wire that runs along the bottom of the reverse light is earth. If you follow it to the left across the pages of the pdf you will find it ends at the -ve symbol. On the way, it passes both the vehicle speed sensor and and the neutral switch too (as you scan along the diagram). I don't know if this means that there is a buss wire or if it the body earth, but it doesn't matter. This will become relevant later, when I describe probing.

It shows the wire colours, but sadly, this pdf is too low a resolution to be able to decipher them.

I have at least 2x pdfs at home, plus the paper copy that I photocopied myself from a manual I borrrowed from Nissan Australia last century. I'm sure that at least one of the pdfs I have (and my photocopy) have legible wire numbers everywhere.

So what I'm telling you is, find a pdf upload that has better quality (if the one you already have isn't good enough), and have a look at that section. The wire colours are shown each side of the switch.

But, there are still things you can do even without a legible drawing. You can use manual methods to probe the wires. Start with a meter connected to the appropriate side of the reverse lamp wiring in the boot (the side that goes back to the switch, not the earth side that I described above) and probe around the gearbox loom under the car until you find continuity. That should be one of the wires. Then, the other wire is known to go to IGN relay 2, shown on the next page of the pdf, with the interesting parts circled n the below image. That wire code circled is the lower wire of the pair that comes in from the left, which is the same wire that leaves the previous page on the right, having come through the reverse switch. You go find IGN relay 2 and you can identify the wire coming out the relay that delivers 12v to these circuits, and probe looking for continuity to wires in the gearbox loom.


As a further plus, the neutral switch should be 2 of the other wires in the gearbox loom. One of them will be earth and the other one will go back to the appropriate terminal on the ECU, which I think is 44, but you should double check with the ECU pinout.

Edited by GTSBoy
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