It flashes rhythmically if the corresponding turn signal lamp on the trailer is on when the trailer lighting is switched on. If the turn signal light on the trailer is faulty, the indicator light will not flash at every turn. It also does not flash - as it used to - when the turn signal is turned on.
However: with the alarm system switched on and the trailer lighting connected, the indicator lamp flashes if one of the direction indicator lamps on the trailer does not work.
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