Disconnect heater control panel connector A (14P). Check for continuity between the No. 7 and No. 8 terminals of heater control panel connector A (14P) and body ground individually. HEATER CONTROL PANEL CONNECTOR A (14P) Wire side of female terminals Is there continuity? YES - Repair any short to body ground in the wire(s) between the heater control panel and the power transistor. NO - Go to step 14. Check for continuity between the following terminals of heater control panel connector A (14P) and the power transistor 4P connector. 14P: 4P: No. 7 No. 1 No. 8 No. 3 HEATER CONTROL PANEL CONNECTOR A (14P) Wire side of female terminals POWER TRANSISTOR 4P CONNECTOR Wire side of female terminals Is there continuity? YES - Go to step 15. NO - Repair any open in the wire(s) between the heater control panel and the power transistor.

Reconnect the heater control panel connector A (14P). Test the power transistor (see page 21-50). Is the power transistor OK? YES - Check for loose wires or poor connections at heater control panel connector A (14P) and at the power transistor 4P connector. If the connections are good, substitute a known-good heater control panel and recheck. If the symptom/indication goes away, replace the original heater control panel. NO - Replace the power transistor. Disconnect the jumper wire. Disconnect the blower motor 2P connector. Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground. BLOWER MOTOR 2P CONNECTOR Wire side of female terminals Is there battery voltage? YES - Replace the blower motor. NO - Go to step 20. Turn the ignition switch OFF. Remove the blower motor relay from the under-hood fuse/relay box and test it (see page 22-80). Is the relay OK? YES - Go to step 22. NO - Replace the blower motor relay.