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 mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the climate control unit.■
NO | - | Check for loose wires or poor connections at climate control unit connector A (22P) and at the mode control motor 7P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■