Audi 80 B4 Schaltplan (Pinbelegung)

Hi!
I am urgently looking for a wiring diagram with pinout for the GRA retrofit of the Audi B4 TDI! Does anyone have one? I really need it urgently! Which pins from the STG are assigned to which pins of the switch?????
Thank you in advance.
Best regards, Timo

Hi,

I also added the GRA. However, I only had to extend the wiring harness up to behind the central electrical system. There, on my B4 TDI 1Z (04/94), there is a narrow, 6-pin, light blue connector with only five connections occupied. I spent 10 minutes searching for the connector because it was hidden behind all the possible wires and only had a short piece of cable. Have you ever looked for it?
When I got the wiring diagram for the GRA from "the friendly," I... Applies to B4 TDI from RA128401.

LSS = Steering Wheel Switch; SG = Steering Gear
LSS1, red-gray, at SG58
LSS2 blue to SG34
LSS3 red-yellow to SG35
LSS4 and 6 black and yellow to SG66
LSS5, black/blue wire at LSS, changes color to red/white on the light blue connector, goes over the plus connection of fuse 27 in the wiring harness on the front right, to the mass flow sensor.

These are the specifications for the B4 with manual transmission. When it comes to automation, it's a bit more complicated.

In the event that the plug is also present in your B4, the wiring: LSS/Plug:
LSS1, red-gray, on connector 2
LSS2 blue on connector 5
LSS3 red-yellow at connector 1
LSS4 and 6 black and yellow to terminal 3
LSS5 black blue to connector4 red white!

The order number for the plug is: 893 971 636 - approx. 2 EURO

If needed (especially if you are driving an automatic), I can scan the electrical diagram and email it to you.

Greetings

MichaelJ

Hi!
Great, it went super fast!
No, I don't have an automatic transmission. My B4 is a 1993 model, but it's actually a 1994 model year. Unfortunately, the FG number doesn't match. However, it's a re-imported vehicle. There seems to be absolutely nothing that matches with the AKTE.
That would actually mean that if I find the blue connector somewhere, then my car should definitely have the cruise control function! I'll go to the mechanic next week to have him check if I already have the function. Now I can make the wiring myself!!!
Once again, thank you very much. That has been very helpful to me!
Oh, have you already installed the mass flow meter or the air flow meter?
I still have the old air meter! It could also be that only the newer STGs (Engine Control Units) have the function for mass meters!!!!???
Best regards, Timo

I must, unfortunately, disappoint you.
If you still have an air flow meter, then you definitely don't have[/b] a GRA function!!!

Based on the entries in the Meckis Audi forum, I must agree with wolfi_b. For Audi 80 TDI with manual transmission, the GRA (Grossraumantrieb) only starts functioning from chassis number RA128401.
Starting from July 1993, automatic transmissions received a new control unit and mass airflow sensor. These changes were then implemented on the manual transmission versions in the spring of 1994. My engine control unit is communicating with VAG-COM using part number 028 906 021 D.

Hi!
What the heck! And simply replacing the STG isn't possible! VAG has messed up again! Did they already have the GRA automatic transmission back then? Or were they also using air flow meters at the beginning?
Best regards, Timo

Ugh - I can't answer that right now - the books are in the car. The changes in July 93 probably concerned ESP - changing the sender from a resistance potentiometer to a contactless inductive measurement, STG, fuel injectors, and LMM - I can't think of anything else right now. In any case, I think it's too much effort to convert. It seems that the changes also increased the torque of the 1Z.

Hi!
In AKTE, I've only found differences in the engine compartment wiring harness, ESP, and STG. The wiring harness is clear, as the mass airflow sensor was installed from there. From there, the ESP with the oval connector was also installed. However, it's not easy to find out how to connect the old wiring harness with other connectors! Does anyone have the wiring diagram for the new wiring harness? Maybe we can modify it so that it fits the new parts!
Best regards, Timo

Hi,

wäre es nicht viel günstiger, eine solche Nachrüst-GRA einzubauen? Waeco verkauft sowas - das wirkt mechanisch auf den Gaszug. Since our TDI doesn't have a gas pedal, you would need to modify it so that it directly acts on the electric gas pedal, but I believe this is the less demanding option compared to a complete overhaul of the engine electronics.

Best regards,

Jan

Hi!
Janein! If the changes were really only to the STG, LMM, and ESP, I could buy the parts for a few euros. Then I could install the GRA and also have an additional 20Nm of torque! My car already has over 210,000 km, so I think a good used ESP would be a worthwhile investment! Eventually, it will break down anyway. And if I ever decide to start modifying my engine (exhausts, software, 12mm pump pistons), I'll definitely want to install a different pump at the same time, because my car is used every day, so any modifications need to be done as quickly as possible!
Best regards, Timo

There are still many more changes:
The charger is different, the AGR valve is in a different location, etc.
Forget it!