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Carefully release the lock tab on the No. 1 terminal (ORN) (A) in the 4P connector, then remove the terminal and insulate it from body ground.
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Reconnect the 4P connector to the power transistor.
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Make sure the ORN wire is completely isolated, then supply 12 V to the No. 1 cavity with a jumper wire.
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Turn the ignition switch to ON (II), and check that the blower motor runs.
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If the blower motor does not run, replace the power transistor.
NOTE: A faulty blower motor can cause the power transistor to fail. If the power transistor is replaced, also check the blower motor for binding, and replace it if necessary.
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If the blower motor runs, the power transistor is OK.
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