did replacing the bulbs fix the issue? I am having the same problem. Whenever i hit a bump it blinks. Uses to blink OFF when i hit a bump. Now it is always off and it blinks ON when i hit a bump. Kind of annoying!
Conclusion
I am having the same problem with my 2000 4Runner Limited 4x4. I think i do have bulbs out but it has to be a a connection or else it would not flash on at all right? Any help would be much appreciated!