All Doors Will Not Lock Using Transmitter

Using voltmeter, backprobe BCM 20-pin connector. Check for a voltage pulse at terminals No. 10, 11, 12 and 13 while pressing transmitter LOCK button. See Figure . BCM is located on junction block behind lower left corner of instrument panel. If there is no voltage pulse, replace BCM. See REMOVAL & INSTALLATION  . If voltage pulse is present, repair harness between appropriate BCM terminal and door lock motor. See WIRING DIAGRAM  .