after run control unit pin outs (324 relay)

[adam g]

Hi, im building an after run circuit for my UR from scratch. Im having trouble connecting the control unit up. From the info ive found on the web i think the circuit should look like this.



ive tried it on the table using a 12v bulb as a motor substitute. Also I have not connected anything to 87b or 87f. It doesn't work but its possible I have broke the unit already as it got really hot at one point when I initially connected a couple of wires differently to the diagram above.

At the moment the lamp comes on faintly without the temp switch circuit connected - and the unit gets very hot.

Does anyone know if the pin outs are correct? Thanks.

[Mikes2]

http://s2-audi.co.uk/workshop/schematics/motronic_3b/page10.png

is what you want

J155 is your relay

[UrS4boy]

Inside the 324 After Run Pump Control Module

Hi, im building an after run circuit for my UR from scratch. Im having trouble connecting the control unit up. From the info ive found on the web i think the circuit should look like this....Does anyone know if the pin outs are correct? Thanks.

The generally functionality looks good in that what you want is the rad fan and the pump to come on when the temp switch on the water manifold closes and then shut off when the switch opens again (closed at 110C, open at 97 C). However, you have to remember that the real 324 is much more complicated because it is also a timer, i.e. 10 minutes on or until the water manifold temp switch closes, which ever comes first. Inside the 324 shows that it is not a relay at all but a control module:

http://forums.quattroworld.com/s4s6/msgs/21503.phtml

[adam g]

I can now see that my circuit cant work. The pump needs two conditions to work. 1) signal from fuel pump relay OFF and 2) live from thermo switch on. Therefore a permanant live must be required to power the pump otherwise with key out it wouldnt work.

So fuel pump live (or key switched live) must go somewhere else? Thanks for diagram but Im still not sure where switched live is, guess it must be 87f?

[ManiacuV6]

87F is going to the fuel pump relay , hence you have 12V on it only when your fuel pump is working.
So you can put it on switched live ( 15).