FULL AUTO AIR CONDITIONER
Troubleshooting
4. Inspection of water-temperature sensor and photo sensor circuits
<Water temperature sensor>
Air conditioner
control panel
Potentiometer
Damper drive
motor
9 Air conditioner
control unit
Water
temperature
sensor
sensor>
Air conditioner
Each sensor
control unit
Air control panel
I
.
Solar
speed
2 0 1 0 0 4 3
Troubleshooting Hints
l
Air conditioner control unit terminal voltages
Terminal No.
Signal name
Condition
Terminal voltage
19
Photo sensor
llluminance 100,000 lux or more
-0.1 to -0.2 v
llluminance less than 0
o v
20
Photo sensor
Normally
o v
9
Water-temperature sensor
Switch OFF [Engine coolant temperature
less than 50°C
Battery voltage
Switch ON [Engine coolant temperature
0 V
50°C (122°F) or higher]
TSB Revision
Summary of Contents for 3000GT 1991
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