Dtc B1411/11 Room Temperature Sensor Circuit

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ROOM TEMP)

INSPECT ROOM TEMPERATURE SENSOR

CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

DTC B1411/11 Room Temperature Sensor Circuit


DESCRIPTION

The room temperature sensor is installed in the instrument panel to detect the room temperature and control the heater and air conditioner AUTO mode. The resistance of the room temperature sensor changes in accordance with the room temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier applies a voltage (5 V) to the room temperature sensor and reads voltage changes as changes in the resistance of the room temperature sensor.

DTC No.
DTC Detection Condition
Trouble Area
B1411/11
Open or short in room temperature sensor circuit
  1. Room temperature sensor
  2. Harness and connector between room temperature sensor and air conditioning amplifier
  3. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1411/11 Room Temperature Sensor Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (ROOM TEMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the intelligent tester main switch ON.

  1. Select the item below in the Data List, and read the value displayed on the intelligent tester.

    Air conditioning amplifier:

    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Room Temp
    		Room temperature sensor / Min.: -6.5°C (20.3°F)
    Max.: 57.25°C (135.05°F)
    		Actual 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
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.INSPECT ROOM TEMPERATURE SENSOR
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1411/11 Room Temperature Sensor Circuit

  1. Remove the room temperature sensor.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (ST+) - 2 (ST-)
    		10°C (50°F)
    		3.00 to 3.73 kΩ
    1 (ST+) - 2 (ST-)
    		15°C (59°F)
    		2.45 to 2.88 kΩ
    1 (ST+) - 2 (ST-)
    		20°C (68°F)
    		1.95 to 2.30 kΩ
    1 (ST+) - 2 (ST-)
    		25°C (77°F)
    		1.60 to 1.80 kΩ
    1 (ST+) - 2 (ST-)
    		30°C (86°F)
    		1.28 to 1.47 kΩ
    1 (ST+) - 2 (ST-)
    		35°C (95°F)
    		1.00 to 1.22 kΩ
    1 (ST+) - 2 (ST-)
    		40°C (104°F)
    		0.80 to 1.00 kΩ
    1 (ST+) - 2 (ST-)
    		45°C (113°F)
    		0.65 to 0.85 kΩ
    1 (ST+) - 2 (ST-)
    		50°C (122°F)
    		0.50 to 0.70 kΩ
    1 (ST+) - 2 (ST-)
    		55°C (131°F)
    		0.44 to 0.60 kΩ
    1 (ST+) - 2 (ST-)
    		60°C (140°F)
    		0.36 to 0.50 kΩ
    NOTICE:
    1. Touching the sensor even slightly may change the resistance value. Be sure to hold the connector of the sensor.
    2. When measuring, the sensor temperature must be the same as the ambient temperature.
    HINT:
    As the temperature increases, the resistance decreases (see the graph).


NG
REPLACE ROOM TEMPERATURE SENSOR
OK


3.CHECK WIRE HARNESS (ROOM TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1411/11 Room Temperature Sensor Circuit

  1. Disconnect the E24 sensor connector.

  1. Disconnect the E41 amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E24-1 (ST+) - E41-29 (TR)
    		Below 1 Ω
    E24-2 (ST-) - E41-34 (SG-1)
    		Below 1 Ω
    E24-1 (ST+) - Body ground
    		1 MΩ or higher
    E24-2 (ST-) - Body ground
    		1 MΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER