HUMIDITY SENSOR INSPECTION

PROCEDURE

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   INSPECT AIR CONDITIONING THERMISTOR ASSEMBLY

   
   

   1. for Glass temperature sensor

      
      
      1. 
         

         Remove the air conditioning thermistor assembly (glass temperature sensor).

      2. Measure the resistance according to the value(s) in the table below.

         Standard Resistance

         Tester Connection Condition Specified Condition 1 (SEG3) - 4 (TFG) 10°C (50°F) 5.92 to 6.09 kΩ 1 (SEG3) - 4 (TFG) 15°C (59°F) 4.94 to 5.07 kΩ 1 (SEG3) - 4 (TFG) 20°C (68°F) 4.20 to 4.29 kΩ 1 (SEG3) - 4 (TFG) 25°C (77°F) 3.64 to 3.70 kΩ 1 (SEG3) - 4 (TFG) 30°C (86°F) 3.19 to 3.26 kΩ 1 (SEG3) - 4 (TFG) 35°C (95°F) 2.85 to 2.91 kΩ 1 (SEG3) - 4 (TFG) 40°C (104°F) 2.58 to 2.64 kΩ 1 (SEG3) - 4 (TFG) 45°C (113°F) 2.37 to 2.43 kΩ 1 (SEG3) - 4 (TFG) 50°C (122°F) 2.21 to 2.26 kΩ 1 (SEG3) - 4 (TFG) 55°C (131°F) 2.07 to 2.12 kΩ 1 (SEG3) - 4 (TFG) 60°C (140°F) 1.97 to 2.01 kΩ

         Note:
         

         • Hold the sensor only by its connector. Touching the sensor may change the resistance value.

         • When measuring, the sensor temperature must be the same as the ambient temperature.

         Tip:

         As the temperature increases, the resistance decreases (see the graph).

         If the resistance is not as specified, replace the air conditioning thermistor assembly (glass temperature sensor).

         Table 1. Text in Illustration

         *a	Component without harness connected (Air Conditioning Thermistor Assembly (Glass Temperature Sensor))
         *b	Heat Conduction Sheet Part
         *c	Resistance (kΩ)
         *d	Temperature (°C (°F))

   2. for Glass surroundings temperature sensor

      
      
      1. 
         

         Remove the air conditioning thermistor assembly (glass surroundings temperature sensor).

      2. Measure the resistance according to the value(s) in the table below.

         Standard Resistance

         Tester Connection Condition Specified Condition 1 (SEG3) - 2 (TNG) 10°C (50°F) 5.92 to 6.09 kΩ 1 (SEG3) - 2 (TNG) 15°C (59°F) 4.94 to 5.07 kΩ 1 (SEG3) - 2 (TNG) 20°C (68°F) 4.20 to 4.29 kΩ 1 (SEG3) - 2 (TNG) 25°C (77°F) 3.64 to 3.70 kΩ 1 (SEG3) - 2 (TNG) 30°C (86°F) 3.19 to 3.26 kΩ 1 (SEG3) - 2 (TNG) 35°C (95°F) 2.85 to 2.91 kΩ 1 (SEG3) - 2 (TNG) 40°C (104°F) 2.58 to 2.64 kΩ 1 (SEG3) - 2 (TNG) 45°C (113°F) 2.37 to 2.43 kΩ 1 (SEG3) - 2 (TNG) 50°C (122°F) 2.21 to 2.26 kΩ 1 (SEG3) - 2 (TNG) 55°C (131°F) 2.07 to 2.12 kΩ 1 (SEG3) - 2 (TNG) 60°C (140°F) 1.97 to 2.01 kΩ

         Note:
         

         • Hold the sensor only by its connector. Touching the sensor may change the resistance value.

         • When measuring, the sensor temperature must be the same as the ambient temperature.

         Tip:

         As the temperature increases, the resistance decreases (see the graph).

         If the resistance is not as specified, replace the air conditioning thermistor assembly (glass surroundings temperature sensor).

         Table 2. Text in Illustration

         *a	Component without harness connected (Air Conditioning Thermistor Assembly (Glass Surroundings Temperature Sensor))
         *b	Heat Conduction Sheet Part
         *c	Resistance (kΩ)
         *d	Temperature (°C (°F))

   3. for Humidity sensor

      
      
      1. 
         

         Remove the air conditioning thermistor assembly (humidity sensor) with the connector still connected.

      2. Turn the power switch on (IG).

      3. Measure the voltage according to the value(s) in the table below.

         Standard Voltage

         Tester Connection Condition Specified Condition 1 (SEG3) - 3 (RH) Humidity is 5 to 15 % 1.01 V 1 (SEG3) - 3 (RH) Humidity is 15 to 25 % 1.37 V 1 (SEG3) - 3 (RH) Humidity is 25 to 35 % 1.73 V 1 (SEG3) - 3 (RH) Humidity is 35 to 45 % 2.09 V 1 (SEG3) - 3 (RH) Humidity is 45 to 55 % 2.45 V 1 (SEG3) - 3 (RH) Humidity is 55 to 65 % 2.81 V 1 (SEG3) - 3 (RH) Humidity is 65 to 75 % 3.17 V 1 (SEG3) - 3 (RH) Humidity is 75 to 85 % 3.53 V 1 (SEG3) - 3 (RH) Humidity is 85 to 95 % 3.89 V

         Note:
         

         • Do not touch the sensor as body heat will affect the inspection results. When performing the inspection, hold the sensor by its connector.

         • Allow the sensor to acclimate to the ambient temperature and humidity before performing the inspection.

         • The specified voltages in the table above are based on inspections performed when the ambient temperature is 25°C (77°F).

         Tip:

         As the humidity increases, the voltage increases (see the graph).

         If the voltage is not as specified, replace the air conditioning thermistor assembly (humidity sensor).

         Table 3. Text in Illustration

         *a	Component with harness connected (Air Conditioning Thermistor Assembly (Humidity Sensor))
         *b	Heat Conduction Sheet Part
         *c	Voltage (V)
         *d	Relative Humidity (%)