I have the wiring diagram for the 1994 model that has the DLR circuits and l'm looking for the 1992 one, It might be Fig. 31 on the wiring diagrams.
The ones l see to download don't have that page, only the later ones seem to.
Does anyone have the full 1992 MY diagrams ?

 

The 92 guide I have doesn't have the DRL's either. They were a requirement for Canada from the 1990 model year, and Canada sill got the Series III V12 sedans until 1992. The wiring is different for the Series III DRL's in each of the 1990, 91 and 92 model years, they were figuring it out as they went along.

It's usually a few relays, as Jaguar made the DRL's about the same as having the low beams on - the side and taillights come on as well. I can't remember if the instrument lights come on as well, but I don't think so. They didn't on my 1995 VDP, nor do they on my X Type.

 

Yes, it seems a complected way to turn the headlights on with the ignition. But we don't know how the rules were written.
I don't understand the DLRs fitted in cars today that only work at the front and also illuminate the dash lights. No wonder we see so many cars at night with just the DLRs on....ANYWAY......I have the oem relay set up and it plugs directly into the green plugs on the left front relay panel and a fuse into the holder that says DRL and so far so good.

My headlights are LED so the half beam power is enough for the bulbs to be on full dip.

 

You should be good, I think with that harness it's a plug and play. Those harnesses are hard to find, you got lucky to get one.

My car was originally a US market car, so no DRL's; and when it was imported into Canada it had a mickey mouse arrangement to get it to pass the Out of Province inspection. I removed that and went back to conventional lights.