RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  B1411  Room Temperature Sensor Circuit  


DESCRIPTION

The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler thermistor (room temperature sensor) changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (5 V) to the cooler thermistor (room temperature sensor) and reads voltage changes due to changes in the resistance of the cooler thermistor (room temperature sensor).

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1411 Room Temperature Sensor Circuit
·

Diagnosis condition: Ambient temperature is -30°C (-22°F) or more

·

Malfunction status: Open or short in room temperature sensor circuit

·

Detection time: None (Present malfunction), continuously for 4 seconds or more (Past malfunction)


·

Cooler thermistor (room temperature sensor)

·

Harness or connector

·

Air conditioning amplifier assembly


Memorized

HINT:

If the cabin temperature is approximately -18.6°C (-1.48°F) or lower, DTC B1411 may be output even though the system is normal.


WIRING DIAGRAM

E396755E04
4.615,1.625 5.073,1.823 0.458,0.198 10 false N43 4.604,1.802 6.938,2.135 2.333,0.333 10 false Air Conditioning Amplifier Assembly 6.167,0.625 6.625,0.823 0.458,0.198 10 false AD 5.74,0.219 6.198,0.417 0.458,0.198 10 false 5 V 4.813,0.521 5.271,0.719 0.458,0.198 10 false TR 4.813,1 5.271,1.198 0.458,0.198 10 false SG-1 4.563,0.521 5.021,0.719 0.458,0.198 10 false 5 4.563,1 5.021,1.198 0.458,0.198 10 false 3 2.969,0.521 3.427,0.719 0.458,0.198 10 false 1 2.979,1 3.438,1.198 0.458,0.198 10 false 2 0.542,1.5 1,1.698 0.458,0.198 10 false N83 0.552,1.656 3.458,1.917 2.906,0.26 10 false Cooler Thermistor (Room Temperature Sensor)

PROCEDURE

1.READ VALUE USING GTS (ROOM TEMPERATURE SENSOR)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Air Conditioner / Data List.


e.

Read the Data List according to the display on the GTS.

Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Room Temperature Sensor Cooler thermistor (room temperature sensor) Min.: -6.50°C (20.30°F)
Max.: 57.25°C (135.05°F) 		Actual cabin temperature displayed Cooler thermistor (room temperature sensor) circuit malfunction
·

When open circuit: -6.50°C (20.30°F)

·

When short circuit: 57.25°C (135.05°F)


Body Electrical > Air Conditioner > Data List
Tester Display
Room Temperature Sensor
50003 121 1
OK:

The display is as specified in the normal condition column.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

2.INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)
2.INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)
a.

Remove the cooler thermistor (room temperature sensor).

Click hereVehicle Interior>HEATING / AIR CONDITIONING>ROOM TEMPERATURE SENSOR>REMOVAL


b.

Inspect the cooler thermistor (room temperature sensor).

Click hereVehicle Interior>HEATING / AIR CONDITIONING>ROOM TEMPERATURE SENSOR>INSPECTION


Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER THERMISTOR (ROOM TEMPERATURE SENSOR))

NG

REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>ROOM TEMPERATURE SENSOR>REMOVAL


3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER THERMISTOR (ROOM TEMPERATURE SENSOR))
a.

Disconnect the N43 air conditioning amplifier assembly connector.


b.

Disconnect the N83 cooler thermistor (room temperature sensor) connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
N43-5 (TR) - N83-1 Always Below 1 Ω
N43-3 (SG-1) - N83-2 Always Below 1 Ω
N43-5 (TR) or N83-1 - Other terminals and body ground Always 10 kΩ or higher
N43-3 (SG-1) or N83-2 - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR