Well their is really no one fix all for your problem. Many things can cause them from working. I would first find the flasher. Jump pass it with a jumper wire to see if all lights will light up. But I have not looked this system up but them might be a BCM control system. If it is. Your best bet is to have a shop look at it. The integration of the BCM into these systems have made it very hard to impossible for a guy to figure them out at home
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