DTC B14A8: Glass Temperature Sensor Circuit [10/2014 - ]: 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.
   AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Glass Temperature	Glass temperature / Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F)	Actual glass temperature displayed	-

   OK

   The display is as specified in the normal condition column.

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

See step  2

1. Remove the air conditioning thermistor assembly (glass temperature sensor) (Refer to REMOVAL [10/2014 - ] ).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.
   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))

Result: 

NG 

REPLACE AIR CONDITIONING THERMISTOR ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  3

1. Disconnect the D62 air conditioning amplifier assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N3-4 (TFG) - D62-6 (TFG)	Always	Below 1 Ω
   N3-4 (TFG) - Body ground	Always	10 kΩ or higher
   N3-1 (SEG3) - D62-35 (SG-4)	Always	Below 1 Ω
   N3-1 (SEG3) - Body ground	Always	10 kΩ or higher

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR