I tried the search but couldn't find anything that matches. My parents have a 1999 rx300 with a dead battery (they were gone for 40 days). The battery was disconnected and charged. Now they have an issue. Here is what I know:
a) Reconnect battery
b) Horn blares continuously after reconnect
Tried the following:
*) close hood, close doors, lock/unlock with remote
*) close hood, close doors, lock/unlock with key
*) close hood, close doors, try starting car (key turns but starter does not