1. Turn the ignition switch OFF, and check for continuity between the following terminals of climate control unit connector A (22P) and the mode control motor 7P connector.

   22P: | 7P:
   --- | ---
   No. 6 | No. 1
   No. 7 | No. 2
   No. 15 | No. 7
   No. 16 | No. 3
   No. 17 | No. 4
   No. 18 | No. 5
   No. 19 | No. 6

Is there continuity?

YES | - | Go to Step 11 .
NO | - | Repair any open in the wire(s) between the climate control unit and the mode control motor.■

1. Perform the A/C communication in the Self-Diagnostic Function to obtain the IS-BUS communication varification status.

Is the communication OK?

YES | - | Check for loose wire 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 printed circuit board, and recheck. If the symptom/indication goes away, replace the original climate control unit and printed circuit board.■
NO | - | Check for loose wire 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 .■