1. Turn the ignition switch ON (II), and check the same terminals for voltage.

Is there any voltage?

YES | - | Repair any short to power in the wire(s) between the climate control unit and the passenger's air mix control motor. This short also may damage the climate control unit. Repair the short to power before replacing the climate control unit.■
NO | - | Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■