DTC B1419/19: Rear Room Temperature Sensor Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn Techstream main switch on.
3. Select the item below in the Data List, and read the value displayed on Techstream.
   DATA LIST / AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Room Temp Sensor(Rear)	Rear room temperature sensor / Min.: -6.5°C (20.3°F) Max.: 57.25°C (135.05°F)	Actual rear room temperature is displayed	Open circuit: -6.5°C (20.3°F) Short circuit: 57.25°C (135.05°F)

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK (Checking from the PROBLEM SYMPTOMS TABLE)	B
   OK (Checking from the DTC)	C

B → See step   4 

C → See step   5 

A: Go to next step 

1. Remove the rear room temperature sensor. Refer to REMOVAL - Step 1 .
   Fig 1: Identifying Rear Room Temperature Sensor

   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
   N13-1 (+) - N13-2 (-)	10°C (50°F)	3.00 to 3.73 kΩ
   N13-1 (+) - N13-2 (-)	15°C (59°F)	2.45 to 2.88 kΩ
   N13-1 (+) - N13-2 (-)	20°C (68°F)	1.95 to 2.30 kΩ
   N13-1 (+) - N13-2 (-)	25°C (77°F)	1.60 to 1.80 kΩ
   N13-1 (+) - N13-2 (-)	30°C (86°F)	1.28 to 1.47 kΩ
   N13-1 (+) - N13-2 (-)	35°C (95°F)	1.00 to 1.22 kΩ
   N13-1 (+) - N13-2 (-)	40°C (104°F)	0.80 to 1.00 kΩ
   N13-1 (+) - N13-2 (-)	45°C (113°F)	0.65 to 0.85 kΩ
   N13-1 (+) - N13-2 (-)	50°C (122°F)	0.50 to 0.70 kΩ
   N13-1 (+) - N13-2 (-)	55°C (131°F)	0.44 to 0.60 kΩ
   N13-1 (+) - N13-2 (-)	60°C (140°F)	0.36 to 0.50 kΩ

   NOTE:

   • Touching the sensor even slightly may change the resistance value. Be sure to hold the connector of the sensor.
   • When measuring, the sensor temperature must be the same as the ambient temperature.

   HINT: 

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

NG → See step   6 

OK: Go to next step 

1. Disconnect the N13 sensor connector.
   Fig 2: Checking Harness And Connector (Rear Room Temperature Sensor - Air Conditioning Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D38 amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   N13-1 - D38-17 (TR)	Always	Below 1 Ω
   N13-2 - D38-7 (SG-6)	Always	Below 1 Ω
   N13-1 - Body ground	Always	1 MΩ or higher
   N13-2 - Body ground	Always	1 MΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7