Do you have a wiring diagram for the J453 controller?
I've got it out of the car, just don't know what pins are what since nothing is labeled.
Unfortunately not... Look at the harness going to it there should be 2 wires going directly back to the clock springs and 2 wire that goes over to the horn buttons (rest of the wires go to the switches.)
The blue wire that comes from the horn buttons / clock spring is pin 1
The brown wire from the clock spring is pin 2
The red/white wire from the clock springs is pin 3
The black wire from the horn buttons is pin 4
See what order they go into the connector and continue the pattern from there.
If I had to guess (and this is only a guess)
Pin 1 V+ in
Pin 2 ground
Pin 3 data out (either analog voltage or bit stream)
Pin 4 horn button in (fairly sure on this one)
Again this is a guess I have done 0 checking or probing on this. (got the can bus adapter working and I can now pull the buttons off the bus so no need to mess with this anymore :wink: )