So, if we start the card and turn on the right blinker. It seems to work o.k. However if
turn on the headlights and check the blinker, no go. The front one works (fast) but no back blinker. Turn off the head lights, and the symptom stays. Looking at the wiring diagram shows that the lamp is operated by a unified electronic module. So, is it possible that the lamp has a bad ground or lead wire that shows open when the headlights are on?