Blower Power Transistor Removal, Installation, and Test: Test

NOTE: Before testing the power transistor, check for climate control DTCs .

Power Transistor - Test

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1. Disconnect the power transistor connector.

2. Measure the resistance between terminals (male terminals) No. 1 and No. 3 of the power transistor. It should be about 1.5 kΩ.:

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If the resistance is within the specifications, go to step 3.
If the resistance is not within the specifications, replace the power transistor.
NOTE:
Also check the blower motor for binding. Power transistor failure can be caused by a defective blower motor.

3. Reconnect the power transistor connector.

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4. Disconnect the following connectors.

5. Connect climate control unit connector A (32P) terminal (female terminals) No. 32:

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and climate control unit connector B (24P) terminal (female terminals) No. 11:

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with a jumper wire.

6. Turn the vehicle to the ON mode.

7. Check that the blower motor runs.

If the blower motor does not run, replace the power transistor.
NOTE: A faulty blower motor can cause the power transistor to fail. Before replacing the power transistor, check the blower motor for binding, and replace the blower motor if necessary .
If the blower motor runs, the power transistor is OK.