After 6 or 7 loooooooooong days of wiring loom splicing im about 90% of the way there.
heres both looms
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ripped apart most of the looms
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all the engine bay/fuse box/cabin fuse box/behind dash/ecu wiring is all from the GD. things kept from the GC were only the DCCD module and thumbwheel, the illumination module (which i fried by accident) and the blower/heater core assembly and controls ie fan control/hazards button/demister/fog lights. so the majority of the work was concentrated to the loom plugs by the drivers footwell that travel to the rear of the car and the passenger foot well plugs that travel into the passenger door
ill spare you all the nitty gritty of the wiring and say some key points
- use these links for wiring diagrams http://ken-gilbert.com/impreza-manuals saved my life
- the GDB's ecu if far far more interlinked with the general wiring than the GC8. the GDB's ecu monitors everything. especially things you wouldnt expect like cruise control, climate control, fuel guage, speedo etc etc. the GC is basically a bunch of stand alone units working together (In my opinion a far far better way for cars to be wired)
- hazards button plug is the same in the GC and GD (straight swap)
- door mirror control plug is also a straight swap
- 2 wire speed sensors will not work with with the GDB ecu. 2 wire systems in the GC uses AC voltage (not sure on AC or DC) which directly drives the speedo needle. the 3 wire system in the GDBs sends its signal to the ecu which inturn sends another signal to the cluster and it will determine the speed. the only way to keep the 2 wire system would be to "flash" the GD ecu so it doesnt pick up the fact it has no sensor, other wise it will go into limp mode. I bit the bullet and bought a GD cluster (with dccd llights!!!) and will fit that into a GC dash (yes it can be done with slight mods which ill post when it happens)
- Version 4 DCCD module seems to work with with the GD cluster (colour code on the cables are the same) altho i have to wait till the gear box goes back in to confirm as its just flashing atm indicating a 'limp mode'
- there are many differences between LHD, RHD, STI, and Aus spec STis in the wiring manual, so be careful. i found out the hard way as the front half of the wiring loom is an AUS sti but the cluster is a non aus sti so the pin out and computers within are different. for example Aus STis have an inbuilt illumination control in the cluster to control brightness where as non aus have an independent illumination module like the GCs
- apart from that, alot of the colours remain the same, so its not the end of the world
heres a photo of some cluster testing, dunno how this one is green does anyone know what version this is from? all the ones ive seen are organge illumination. I LOVE the green colour, something about that 90's shitty weak green is nostalgic for me
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