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U–48 CONTROL SYSTEM 1C Blower motor Power MOS FET Fan switch is OFF Below 1.0 • Inspect terminal voltage of climate control unit (1A) Fan switch is at manual 4.1 Fan switch is at manual 7.9 1D — — — — — 1E Rear window Rear window Rear window defroster 12 • Inspect for continuity or short circuit (Climate control • Inspect rear window defroster relay Rear window defroster Below 1.0 • Inspect terminal voltage of climate control unit (1H, 1L) • Inspect audio switch panel 1F On-board A/C check Terminal A of A/C check Below 1.0 • Inspect for continuity (Climate control unit—A/C Other 5.4 • Inspect short circuit (Climate control unit—A/C check • Inspect terminal voltage of climate control unit (2H, 2L) 1G — — — — — 1H — — — — — 1I GND • Cabin temperature • Evaporator temperature • Ambient temperature • Water temperature • Air mix actuator • Airflow mode actuator Under any condition Below 1.0 • Inspect terminal voltage of climate control unit (2L) 1J — — — — — 1K Ambient Ambient Depends on temperature See Figure 2 • Inspect for continuity (Climate control unit— • Inspect for short circuit (Climate control unit— • Inspect ambient temperature sensor • Inspect terminal voltage of climate control unit (2H, 2L) 1L — — — — — 1M Cabin Cabin temperature Depends on temperature See Figure 3 • Inspect for continuity (Climate control unit— cabin • Inspect for short circuit (Climate control unit— cabin • Inspect cabin temperature sensor • Inspect terminal voltage of climate control unit (2H, 2L) 1N — — — — — Terminal Signal Connected to Test condition Voltage (V) Action |