I checked that thermal cut off was blown so I replaced the thermal cut off using part from Fry's. They have a 117C thermal cutoff for $1. After that the blower came on with full speed by just turning the keys to ON position. Turning on/off the climate control made no difference in the blower speed. Then I followed the power transistor tests described on page 21-120 of the service manual. That indicated that the transistor was also dead. At that point it was faster for me to drive to dealership and buy the whole transistor assembly for $60. Problem solved.
1. Disconnect the 5P connector from the power
transistor.
2. Measure the resistance between the No. 1 and
No. 4 terminals of the power transistor. It should be
approximately 1.4 1.5 k .
• If the resistance is within the specifications, go to
step 3.
• If the resistance is not within the specifications,
replace the power transistor.
3. Carefully release the lock tab on the No. 3 terminal
(ORN/BLK) (A) in the 5P connector, then remove the
terminal and insulate it from body ground.
4. Connect a 1.2 3.4 W bulb (B) between the No. 3
and the No. 4 cavity on the 5P connector.
5. Reconnect the 5P connector to the power transistor.
6. 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, replace the climate
control unit.
By the way, after the fuse replacement, DTC test worked and showed a DTC N for problem with blower circuit. I took a short cut described above without going into 47 steps diagnostics of blower circuit starting on page 21-99.
Thanks