[tom.stiller]

I know this is an ancient thread, but I had exactly the same issue. All exterior turn signals worked fine, but usually the interior left and right turn indicators both flashed simultaneously at a dimmer level. The user manual says this indicates one of the four exterior bulbs are out. Mine were not out. Saw in another thread that replacing the flasher relay (located behind the fuel/oil level gauges) fixed the issue for one guy. Thought I would try just removing the relay and ‘polishing’ the four contacts on the bottom first. Removed it, polished with some sandpaper, re-installed the relay and viola, my interior turn indicators started working properly.