First off thanks to folks who have responded to my earlier posts. The wire in the steering wheel is intact and in good shape.
If anyone has a wiring diagram for the 2003 showing the horn circuit I need it!
I've replaced the ignition switch and switch assembly twice now.
Key off, the horn works normally
Ignition switch off and ignition switch plug disconnected, the horn works normally
Key on, ignition switch connected or disconnected no horn! This almost seems connected to the steering wheel lock engaging., but that seems more like mere coincidence
This is very repeatable (and annoying).
After replacing the ignition mechanism for the second time, the horn worked normally with the ignition on, and seemed repaired before the dash was re-assembled. After re-assembling the dash it was right back to working with ignition off, and not working with ignition on.
Taking apart the left vent to have at it again, I checked operation after every removed item, and it began operating normally with the vent removed. Replaced the vent and it worked normally for a short period, then right back to working with the ignition off, but not with the ignition on.
Any thoughts (and a wiring diagram!) would be greatly appreciated.