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.■

1. Reconnect climate control unit connector B (16P).

1. Test the power transistor.

Is the power transistor OK?

YES | - | Check for loose wires 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 recheck. If the symptom/indication goes away, replace the original climate control unit .■
NO | - | Replace the power transistor.■

1. Disconnect the jumper wire.

1. Disconnect the blower motor 2P connector.