DTC B14AA: Glass Humidity Sensor Circuit [02/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
5. Check the value(s) by referring to the table below.

   Body Electrical > Air Conditioner > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Glass Humidity	Glass humidity	Min.: 0.00% Max.: 100.00%	Actual glass humidity is displayed	-

   Body Electrical > Air Conditioner > Data List 

   Tester Display
   Glass Humidity

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to Problem Symptoms Table)	B
   OK (When troubleshooting according to the DTC)	C

Result:  2

B 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2014 - 11/2016]  Refer to  PROBLEM SYMPTOMS TABLE [11/2016 - ] 

Result:  3

C 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

Result:  1

A 

See step  2

1. Disconnect the S14 air conditioning thermistor assembly (glass humidity sensor) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   S14-5 (S5V) - Body ground	Power switch off	Below 1 V
   S14-5 (S5V) - Body ground	Power switch on (IG)	4.5 to 5.5 V

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

See step  4

Result:  1

OK 

See step  3

1. Reconnect the air conditioning thermistor assembly (glass humidity sensor) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Air Conditioning Thermistor Assembly (Glass Humidity Sensor))	*b	Sensing Portion
   *c	Voltage (V)	*d	Relative Humidity (%)

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)	5 to 15 %	1.01 V
   	15 to 25 %	1.37 V
   	25 to 35 %	1.73 V
   	35 to 45 %	2.09 V
   	45 to 55 %	2.45 V
   	55 to 65 %	2.81 V
   	65 to 75 %	3.17 V
   	75 to 85 %	3.53 V
   	85 to 95 %	3.89 V

   NOTE:

   • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
   • The output voltage at an ambient temperature of 25°C (77°F) is shown above.

   HINT: 

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

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY (GLASS TEMPERATURE SENSOR). Refer to  REMOVAL [02/2014 - ] 

Result:  1

OK 

See step  4

1. Disconnect the S14 air conditioning thermistor assembly (glass humidity sensor) connector.
2. Disconnect the F80 air conditioning amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S14-3 (RH) - F80-28 (RH)	Always	Below 1 Ω
   S14-3 (RH) - Body ground	Always	10 kΩ or higher
   S14-1 (SEG3) - F80-35 (SG-5)	Always	Below 1 Ω
   S14-1 (SEG3) - Body ground	Always	10 kΩ or higher
   S14-5 (S5V) - F80-31 (S5-4)	Always	Below 1 Ω
   S14-5 (S5V) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR