The Patient: 1994 740iL
I am still on my mission to resolve my blown Fuse #9 issue.
The problem seems to occur when I get the "ding" that the ambient
temperature crosses the 38 degree setpoint. My only knowledge of the failure
is that my horns quit working.
Per the prints, Fuse #9 feeds K19 compressor control relay, the auxillary
water pump, washer jet heaters and windshield defogger.
I replaced the fuse, drove with the IHKA brain box removed and suffered no
I reinstalled the IHKA board and disconnected the aux water pump and the
I replaced the fuse and disconnected both jet nozzle heaters and the fuse
I replaced the fuse and disconnected K19 compressor control relay and the
The only thing left that can possibly be wrong is defective windshield
defogger or associated wiring. Now I am trying to find a way to isolate this
1) Has anyone else had experience whereby the windshield defogger was
2) Where is connector X162? The electrical troubleshooting manual merely
states located at the base of the windshield. Can this be accessed from the
engine compartment area or from inside the car? Degree of difficulty to get
to the connector to disconnect it? Or should I try to isolate this at the
Aux Water Pump Relay?
3) Lastly I would love to relocate the hot lead for my horns to another fuse
location. I can live without an aux water pump, jet heaters or windshield
defogger. I cannot live without my horn, especially on Chicago expressways!!