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Usually, a fast flashing signal light means a short in the electrical system. I have seen where the signal filament inside the bulb breaks and falls on the parking light or taillight filament, this causes a short and a fast signal light. My '99 has turn signal lights and separate brake/taillights in the back, so the signal bulbs have only one filament, the turn light. I do not know if your RAV does to. I would check the front turn/parking bulb to see if this has happened because they have two filaments. Otherwise a faulty bulb or bad socket. Try switching the bulb to the other side to see if the fast signal moves. If the bulb was black on the outside to me that means socket is bad.
Some bulbs can only be inserted one way. Make sure you are not putting a square peg in a round hole so to speak. (I have seen it done.)
Last edited by Marko59; 12-20-2014 at 12:21 PM.
Reason: Added bulb one way to insert in socket