UPDATE ... PROBLEM SOLVED.

So I have it all sorted out ... the inoperative horn was an open relay coil for the horn in the Relay Control Module. After replacing the defective repay today the horn is now working as it should.

HORN relay location.


All of the other problems initially mentioned were not related and are functioning as they should. The interior light issue was not related to any other issue and the lights are now working once I placed the interior light switch in the position to activate the lights when the door is opened.

Thanks Again for everyone's help and suggestions ... it was Very Much Appreciated.
Brian