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: where is flash module 03 3500 mark ludwig 03-20-2005, 10:16 AM I have no turn signals or 4 way flashers. all fuses are good , fuse to ibec-1 is good also.brake lights work, my trailer must of taken something out. Did they do away with round flashers. I found nothing under dash. thanks mark Cougar281 03-20-2005, 12:32 PM I was told by a friend that a computer in the dash takes care of turn signals and such, probably the BCM. GMCSID 03-20-2005, 01:15 PM Check IGN E fuse and FLASHER fuse. You have to remove the knee bolster trim to get to the module. | ||