4-door Disconnect the 4P connector from the power transistor. Measure the resistance between the No. 3 and No. 4 terminals of the power transistor. It should be about 1.4 - 1.5 k ohm. If the resistance is within the specifications, go to step 3. If the resistance is not within the specifications, replace the power transistor. POWER TRANSISTOR Carefully release the lock tab on the No. 1 terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground. Reconnect the 4P connector to the power transistor. Supply 12 volts to the No. 1 cavity with a jumper wire. Turn the ignition switch ON (II) and check that the blower motor runs. If the blower motor does not run, replace the power transistor. If the blower motor runs, the power transistor is OK.

5-door KE Model Disconnect the 4P connector from the power transistor. Measure the resistance between the No. 1 and No. 2 terminals of the power transistor. It should be about 1.4 - 1.5 k ohm. If the resistance is within the specifications, go to step 3. If the resistance is not within the specifications, replace the power transistor. POWER TRANSISTOR Carefully release the lock tab on the No. 4 terminal (BLU/YEL) (A) in the 4P connector, then remove the terminal and insulate it from body ground. Reconnect the 4P connector to the power transistor. Supply 12 volts to the No. 4 cavity with a jumper wire. Turn the ignition switch ON (II) and check that the blower motor runs. If the blower motor does not run, replace the power transistor. If the blower motor runs, the power transistor is OK.