DTC B1411/11: Room Temperature Sensor Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body / 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
   Room Temperature Sensor (Room Temp)	Room temperature sensor / Min.: -6.5°C (20.3°F), Max.: 57.25°C (135.05°F)	Actual cabin temperature displayed	-

   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 DTC)	C

C → See step   5 

B → See step   4 

A: Go to next step 

1. Remove the room temperature sensor.
2. Disconnect the connector from the room temperature sensor.
   Fig 1: Identifying E25 Connector Terminals & Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E25-1 - E25-2	10°C (50°F)	3.00 to 3.73 kΩ
   E25-1 - E25-2	15°C (59°F)	2.45 to 2.88 kΩ
   E25-1 - E25-2	20°C (68°F)	1.95 to 2.30 kΩ
   E25-1 - E25-2	25°C (77°F)	1.60 to 1.80 kΩ
   E25-1 - E25-2	30°C (86°F)	1.28 to 1.47 kΩ
   E25-1 - E25-2	35°C (95°F)	1.00 to 1.22 kΩ
   E25-1 - E25-2	40°C (104°F)	0.80 to 1.00 kΩ
   E25-1 - E25-2	45°C (113°F)	0.65 to 0.85 kΩ
   E25-1 - E25-2	50°C (122°F)	0.50 to 0.70 kΩ
   E25-1 - E25-2	55°C (131°F)	0.44 to 0.60 kΩ
   E25-1 - E25-2	60°C (140°F)	0.36 to 0.50 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.

   HINT: 

   As the temperature increases, the resistance decreases (see the graph. See Fig 1.).

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Room Temperature Sensor)
   *b	Sensing Portion
   *c	Resistance (kΩ)
   *d	Allowable Range
   *e	Temperature (°C (°F))

NG → See step   6 

OK: Go to next step 

1. Disconnect the connector from the A/C amplifier.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E30-29 (TR) - E25-1	Always	Below 1 Ω
   E30-34 (SG-1) - E25-2	Always	Below 1 Ω
   E30-29 (TR) - Body ground	Always	10 kΩ or higher
   E30-34 (SG-1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5