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This works on my 2003 K2500HD. Have only done the disable, haven't checked out the other features. Beginning with the ignition in the LOCK position. Pull the turn signal/multifunction lever all the way toward you and hold it there. Turn the ignition to the RUN position and then to the LOCK position twice. With the ignition in LOCK, release the multifunction lever. The doors lock and then unlock to signal entry into program mode. Select one of the following options for the automatic door lock. * To disable the automatic door lock feature and the automatic door unlock feature, press any door lock switch twice. * To enable the automatic door lock feature but disable the automatic door unlock feature, press any door lock switch once and then press any door unlock switch three times. * To enable the automatic door lock feature and the driver side door unlock option, press any door lock switch once and then press any door unlock switch once. * To enable the automatic door lock feature and the all door unlock option, press any door lock switch once and then press any door unlock switch twice. Exit Programming by turning the ignition switch to RUN or wait until 10 seconds elapse with no input to the lock switches.
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