I must be checking at the wrong location, because both front sensors read continuity. I pulled the wires from the sensor at the caliper location and read across the terminals in the sensor plug that's bolted to the caliper.

Did you mean to instead unplug the sensor lead in the engine compartment at the wheelwell and check across the plug there?

It seems odd that both are reading no resistance. I noticed there's a relay for the ABS system - so should the ignition be on during the test?

Thanks,
Frank