I just bought a used T&C with blind spot detection. There were no warnings when I test drove it, but I when I went to get it inspect 3 days later the BSD system was in error and off. I figured out how to get to the sensors and can get used one on-line, but I don't want to jump to that if it could be something else.

Is there a way to test each module independent of the whole system?

AFAIK it could be wiring harness or something in the display rather than the sensors themselves.

Thanks,
Karl

 

These detectors are prone to failure because of their location. You'd probably need a good auto electrician to test each one but, depending on how much you would need to buy replacements, it may be cheaper to just buy a pair.