Note On INTERMITTENTS:
WARNING: This page is about a different car, the 1986 Oldsmobile Toronado and 1986 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
If an intermittent Code B671 is being set, manipulate the related wiring while observing BCM data BD70. If the failure is induced, the reading will jump from its normal value to a reading below 3%.