I think I have a problem with the integrated control unit (ICU) that
operates the front side markers on this 91 Civic.
When either the left or right turn signals are operated, _both_
and left side markers flash. Only the same side is supposed to flash.
This is the problem. it sends mixed signals to other drivers.
When the parking lights are on, the orange front side markers are
supposed to be on. They aren't.on with either the parking lights or
headlights. If the turn signals are operated, both side markers
flash. The side markers are supposed to be on, and flash alternately
with the turn signal.
When the emergency flashers are operated, both sidemarkers flash at
the same time.
I have a wiring diagram and it shows the side markers controlled by
the ICU. The wiring diagram shows the ICU residing in the fuse panel.
Can anyone shed some light on the ICU? Is it part of the fuse block?
Is there something else besides the ICU that can cause these syptoms?