by loot » Tue Jun 23, 2015 6:56 pm
check fuse f48 5A in the glovebox fusebox (ajb) and also see if relay r14 is clicking when you press the horn on the wheel, if not, Take the lower steering plastic cowl off and you'll see a connector at 6 o clock, unplug it and you'll see it has 1.........9 you need to bridge pins 6 and 7 on the connector to activate the horn.
If the relay is clicking then the problem is the wiring from the relay to horn.
On mk7 the switch activates the negative side of the relay built into the bcm which sends live power to the horn relay which activates the positive side of it, the horn has a negative and the squib has a negative, bcm internal positive kl30 bus and fusebox r14 positive relay.
56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here