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TROUBLESHOOTING AUTOMATIC AIR CONDITIONER 55B-21 Inspection Procedure 3: The blower air volume cannot be changed BLOWER POWER BLOWER COMBINATION BLOWER MOTOR METER AND A/C-ECU Wire colour code Blower Motor Circuit COMMENTS ON TROUBLE SYMPTOM If the blower air volume can not be changed when POSSIBLE CAUSES • Front power transistor • Damaged the wiring harness or connectors • Malfunction of the combination meter (meter and A/C-ECU) Step 1. M.U.T.-III actuator test • Item 01, 02, 03: Blower motor Q: Does the blower motor work normally? YES : Go to Step 2. NO : Go to Step 3. Step 2. Replace the power transistor and check Q: Does the blower motor work normally? YES : This diagnosis is complete. NO : Replace the combination meter (meter and Main Index Group TOC |