ABY Wiring Harness Help/Identification

[S2central.net]

T6r/5 needs to extend to terminal K4 on the CEP - that is a new wire to run on your application. See page 9 of my schematic primer doc showing how the 'K' block extends from relay position 3 on the CEP... This is a different relay than used on 7A engine according to relay pinouts shown in Bentley.

[S2central.net]

See sheet 96-20-19 on tracks 74/75 where the blue/yellow signal on T6r/2 from ABY loom to Autocheck appears via T3a/2 on the MY90/91 CQ

[Ruffiano]

Oh you mean T1f, T5h and T6r that don't show as that on 7A engined CQ - that is your main vehicle loom that you are grafting ABY into - right ?

Let me dig out the Bentley and see where these pins appear on US CQ - what year is yours Ruffiano ?

Mine was built 04/90, had the newer style exhaust manifold and has an airbag

[S2central.net]

Looking at T6r - some creativity required here as your host loom precedes what a later CQ would have been wired up with.

Only three pins of note on ABY T6r connector -

#1 - red/green to V5 (windscreen washer pump) from B53c on the CEP
#2 - blue/yellow to F66 / F76 (coolant alarm for autocheck)
#5 - red/brown to J155 (afterrun pump control)

#1 is covered on the 1990/91 CQ loom from B53c with green/red wire via T3a/1 - see 92-10-11. T3a is a brown 3-pin plug in right side of engine compartment.

[S2central.net]

T1f - Reverse lights - look at sheet 94-50-7 attached... You want T5a/2 which is a 5-pin plug in right side of engine compartment - guess that was on 7A loom - so seek out T2n/1 (blue/red wire) - apparently a white bodied 2-pin plug on right side of engine room.

[S2central.net]

Oh you mean T1f, T5h and T6r that don't show as that on 7A engined CQ - that is your main vehicle loom that you are grafting ABY into - right ?

Let me dig out the Bentley and see where these pins appear on US CQ - what year is yours Ruffiano ?

[Ruffiano]

The three plugs that don't have homes on the ABY Harness... The only one I'm concerned about its T5H, I would like the after-run pump to work properly, only when the engine is off.

[S2central.net]

Whats to figure out - I thought you had it all nailed ?

[Ruffiano]

I could really use some insight, the dash is going in tonight with our without answers...

[Ruffiano]

excellent, I'm happy to hear that Peter, thanks. Now to figure out the rest...

[PeterS]

Dave:
That temperature sensor is for the climate control system only and will have no impact on the ECU/engine running - its a completely separate system. was on the B3/B4 and also the C4.....

-Peter

[Ruffiano]

Well I ended up putting in a standard, b4 manual climate control, I still have the same plugs un hooked, the ones above, plus just a couple on the aby harness. namely:

T1F
T6R
T5H

T1f i'm not worried about since it is reverse lights, I'm most concerned about t5h, i would like the afterrun pump to work and i'm affraid it won't work properly without it hooked up. T6r i'm not worried about since I have no idea what it is for. Under the hood I have one question regarding the plug on the Heater core hose, there is a blue plug on it presumably a temperature sensor, however i do not have a wire to plug in. Also my EVAP system is not hooked up currently, will this cause a no start condition?

[S2central.net]

Yip

[Ruffiano]

how is the head unit coded? Vag-com?

[S2central.net]

Why not replace crappy old digital with newer digital ?

All you need is the right donor vehicle - either a B4 or B5... you really want the head unit from B4 though so it can be coded for 5-cyl so that the compressor speed signal can be ignored.

Thx for the pics - will try to solve them.