Sam: sure, but I think that I answered this question in the forum in another place
Here is my cut-down version of the for the Horn-relay on a mk7 Golf:
So, the horn relay (J413) is connected to
T46b /24 on the .
As you can see and if I'm reading the
wiring diagram correctly, the +ve side of the relay coil for J413 is connected to fuse #15 on the B fuse box (the one in the engine bay) and this coil is energized when the (J519) receives the correct CAN message from J527 (as per my previous post) by earthing the other side of the coil (via pin #24, socket B inside the ).
I guess that you could confirm the operation of this pin on your by connecting a multi-meter (switched to volt mode) to pin#24 and earth. Without pressing the horn plate, pin #24 should be somewhere near the car's rail voltage. Press the horn pate on the steering wheel and pin # 24, socket B should be shorted to earth (i.e. zero volts) if the CAN message has been received correctly from J527
As for your assertion (on another forum) that the horn relay is connected to
T46b/14 and that this pin is missing on your new , my information suggests that this pin is dedicated to F387 Bonnet contact switch. The second thing that I would mention about this assertion is my surprise that you don't have any error message from the if the connector pin for J413 is missing on your unit.
Intuitively, I would have expected the to monitor the presence of some Volts on the horn-plate solenoid pin in case the fuse blows, or the coil itself is faulty. With the horn plate not pressed, the horn plate pin (be it pin #24, or another pin) should see an open-voltage (~13.8V) on the other side of the solenoid wire. However, If the connector pin for the horn-plate is not not connected on the , the solenoid pin sees no voltage at all - hence I would expect a resulting error message in this instance. This is a very long way of saying that if you do not have an "open-circuit" error message on the - it's more than likely that the solenoid is connected to the correct pin (I think)
Don