Big bad swap thread... 01.5 1.8t manual into a 99 2.8 a4 auto Questions to be asked!

[whitelite]

I am swapping my high mile chassis... built 01.5 1.8t 6 speed into a mint second owner low mile 99 Jaspis a4 2.8t auto chassis. I have everything figured out and aquired except the wiring differences. I noticed the plenum connections behind the ECU are Black,Tan,Orange Red, Orange and Blue on my 2.8 and Black,Tan,Orange Red, Orange and White on the 1.8t 01.5

My question for anyone who has ever done this swap is did you wire the white connector directly into the body harness or did you swap that out?

I have been searching for body harness diagrams for a few days now before posting this post. I have not found any info as to where I can wire these into.

This is what the white connector controls:



- T15, White, 15 pin
1. yellow/blue - to pin 1 (4 on 2001) on throttle body
2. yellow/lilac - to pin 2 on throttle body
3. brown/red - to pin 3 on throttle body
4. green/yellow - to pin 4 (5 on 2001) on throttle body
5. green - to pin 5 (1 on 2001) on throttle body
6. brown/green - to pin 6 on throttle body
7. red/grey - to pin 1 on connector T6y
8. blue - to pin 2 on connector T6y
9. red/yellow - to pin 3 on connector T6y
10. black/white - to pin 6 on connector T6y
11. red/black - to pin 2 on brake light switch
12. white/red - to pin 4 on brake light switch
13. red/green - to pin 1 on clutch vacuum vent valve switch
14.
15.

[Nollywood]

I don't recall seeing the blue connector on any facelift car I've worked on.

Is the 1999.5 car non-DBW? As in does it have a throttle cable?

[whitelite]

That is what is so confusing to me.. it is a DBW face lift car.

[whitelite]

Shoot your right. It is a 99.5 but it is cable.. damn

[Nollywood]

Is it possible the blue connector is for a system NOT on the engine? I was going to say aircon, but the aircon harness is a stand alone, running behind the driver's side fender.

How many wires are in the connector?

- - - Updated - - -

Looks like just 2 wires.

[whitelite]

It is just 2 wires, the white connector is 15 pin but only 13 are utilized. I am looking into DBW conversions now and it looks like the body harness is essentially the same except for the pedal assembly harness.

[Nollywood]

Shoot your right. It is a 99.5 but it is cable.. damn

It's not the end of the world. The DBW gas pedal harness is pretty self-contained, and the receiving connector in the car can be added. Luckily, the 1999.5 has the same body connectors as the 2000-2001.

- - - Updated - - -

It is just 2 wires, the white connector is 15 pin but only 13 are utilized. I am looking into DBW conversions now and it looks like the body harness is essentially the same except for the pedal assembly harness.

Exactly.

[whitelite]

Unfortunately I had to scrap my donor car before I could pull the body harness but then again it was a hack job from the previous owner and one of the main reasons I wanted to get rid of it. I guess at this point I have a few options. Try to locate the diagrams to wire in the plug to the existing harness or head to the junk yard and rip one out. Not sure where to start on the wiring.


The good news..

PEDAL TO FUSEBOX/ECU LOOM
white plug from ECU box and connectors for clutch, brake and throttle body.

[Nollywood]

I've got the wiring diagram for 2000-2001. I'll dig it out.

[Nollywood]

This is for the 2000-2001 B5. This is for a 2.8 30V, but it doesn't matter. You could use the wiring diagram for a 2000 A6 4.2 V8, and it's the same too.

That's the beauty of modular harnesses.

[whitelite]

Thanks! Hopefully this white connector just runs to the pedal assembly and it will be a simple addition.

[PZ.]

I thought the white connector was for the auto trans. You probably need to repin at least one of the interior connectors. The interior harness pins for the ECU power are not the same in the V6 harness as they are in the 1.8T. When I swapped my 1.8T 6sp in place of the V6 Tip, there was no power to the ECU. Fortunately, I had the donor (both 01 B5 wagon, non-facelift Passats) with the manual wiring and I needed to replace my leaking heater core, so I just pulled the whole dash harness out and swapped it in.

[Nollywood]

Did you swap the entire dash harness then?

[PZ.]

Yes. I had good running donor car with the 1.8T, but it was a FWD. I had picked up the S4 trans a year earlier. I did not know about the interior harness differences until after the swap and the car would not start. Since my heater core was leaking and I wanted the OEM wiring for the clutch vent valve and cruise control, I had planned on swapping the harness eventually. I just got forced to do it a bit sooner.

[Mad Cow]

This may help: http://www.audizine.com/forum/showth...ion-infothread. I started with basically the same car, only difference being the transmission. The hardest part is mapping which wires goes where, luckily for you it's all in the spreadsheet in the zip file I linked about halfway through the first post. Let me know if you need help with anything specific, my memory is a bit foggy though seeing as I did it nearly 3.5 years ago.