1. Check for continuity between the following terminals of climate control unit connector B (16P) and power transistor 4P connector.
   16P: | 4P:
   No. 1 | No. 1
   No. 2 | No. 3
Is there continuity?
YES | - | Go to Step 19 .
NO | - | Repair any open in the wire(s) between the climate control unit and the power transistor.■
Reconnect climate control unit connector B (16P). Test the power transistor. Is the power transistor OK?
YES | - | Go to Step 21 .
NO | - | Replace the power transistor.■
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 B (16P) and at the Power transistor 4P 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 B (16P) and at the power traisistor 4P 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 .■
Disconnect the jumper wire. Disconnect the blower motor 2P connector. |