Technical Tips > Electrical-Electronics-Air-Lighting-Guages-Security-Vacuum

C4 1990 Electrical Ccts FSM

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Vettech:
OK, found it, another obscure little diag on the net.
And the only buttons I did not press was the Radio, yes its the Amplifier relay, for the supa dupa Bose System, and the only section in my 87 book I did not look at was the Radio etc, and yes the wiring, type & colours are a match. Done!.

But before I put it back together c/w the Instruments, I'll just double check the pump operation & relay.

sirfixalot:
 I find the colour codes on  wiring doesn't change from one year to another so the relay you can't identify you will probably be able to identify from 87 circuits, when i was reading your description of relay with yellow wiring i automatically thought of starter relay which you went on to identify. What colour are wires on relay you cant identify

Vettech:
Thanks Sirfixalot. Got them all sussed out, the Start Enable Relay, the C68 AC Compressor Relay and the mysterious Bose Amp Relay.  Also my fuel relay and pump are OK, age and the higher level of padding and insulation prevented me hearing it run.

I filled the 2" hole in the vent ducting, now I get a good level of AC coming out the RH face vent. However other holes and ducting mismatches, once corrected will also increase the air flow. Once again I wish I had bought one of those optic fibre camera's, you know the ones you stick in tight places to see thing's. Between limited light, access and head cramped up under the dash, I think when they mounted the Steering etc (chain&bar), they ground/sliced a section out of the AC Fan housing body to clear the mounting bolts.
Upon running the AC - I can feel air and hear the fan, but can't see into the tight space, I'd hazzard a guess that there is a ~ 20mm hole or oval hole thats leaking air and most likely screwing up the fan's ability to operate at max efficiency.

I'm becoming an expert at using Black Silastic sealant, it amazing where you can stick it, paint it, plaster it to overcome the shortcomings of previous converters. I still have one small corrugated duct that feeds the vent directly under the steering wheel right between the drivers legs, the ................... cooler vent.

Vettech:
Sirfixalot - question.
I'll try to get a pic up, but do you know what a three (3) pin plug with Black and a White with black stripe wires would go to.
It too is hanging under the RH steering column, I've paired up all moduls and plugs, the only other two wire plug is the Orange&White which I'm sure is for the foot well lighting.

Also armed with Dentist pick & a sneaky mirror on a stick I've proved there is a hole in the air box, which now has a piece of Corflute type material cut and pasted into place, blocking and sealing the hole. Its amazing how much more air comes out where it should once these mongrel holes are sealed up - soon it will be toooo cold in the drivers seat - heaven forbid !....

sirfixalot:
Looks like it clips onto something sheet metal will have a look tonight first thing that came to mind was vats with 2 wires but plug is totally different, maybee key chime alarm  but that is normally incorporated into harmonica plug for blinker switch

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