1) Turn the ignition switch to OFF.
2) Measure the resistance between mode door actuator terminals using a tester.
Connector & terminal
(B77) No. 3 — No. 1:
(B77) No. 3 — No. 2:
(B77) No. 3 — No. 5:
(B77) No. 3 — No. 6:
Is the resistance 80 — 100 Ω?
Replace the mode door actuator.