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short or wrong bulbs
Check the bulb, it could be blown.
As with all vehicle a bulb has failed
It is possible one of the left side light bulbs is burnt out. A burbt out bulb will cause a higher current to pass through the flasher component and the flasher will rapidly cycle on and off.
Same flasher for left and right signals but a different flasher for the emergency flashers.
Check bulbs Replace flasher
your flasher is a combination unit turn & flasher on top of your diagnostics test unit on the left side of steering column
The turn signal and brake light use the same bulb. When you get a fast flash, it is from a reduced electrical load being placed on the flasher unit due to a burned bulb. Replace the bulb and this should fix your problem.
The flasher is a rectangular unit located under the dashboard on the "kick" panel, to the left of the driver's left foot.
The flasher relay is on the left of the driver side below the dash. Just pull it out.
The flasher is located in the convenience center, it is under the dash to the left of the steering column.
900 or 9000? On the 900 (left-hand drive), the turn signal flasher is located just to the left of the steering wheel.