RM38N0EC _58 Vehicle Interior _111841 HEATING / AIR CONDITIONING _0499788 AIR CONDITIONING SYSTEM(for Gasoline Model) C

HEATING / AIR CONDITIONING AIR CONDITIONING SYSTEM(for Gasoline Model) B141A11 Room Temperature Sensor Circuit Short to Ground

DESCRIPTION

The room temp. sensor (cooler thermistor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the room temp. sensor (cooler thermistor) 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 to the room temp. sensor (cooler thermistor) and reads voltage changes due to changes in the resistance of the room temp. sensor (cooler thermistor).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from	Priority
B141A11	Room Temperature Sensor Circuit Short to Ground	Diagnosis Condition: Ignition switch ON Malfunction: Short (GND) in room temperature sensor circuit Detection Time: Continuously for 4 seconds or more	· Room temp. sensor (cooler thermistor) · Harness or connector · Air conditioning amplifier assembly	Memorized	Air Conditioner	A

WIRING DIAGRAM

0.188,1.802 0.521,2 0.333,0.198 10 false E57 0.188,1.979 2.677,2.167 2.49,0.188 10 false Room Temp. Sensor (Cooler Thermistor) 4.635,1.792 6.938,2.073 2.302,0.281 10 false Air Conditioning Amplifier Assembly 2.146,0.667 2.323,0.885 0.177,0.219 10 false 1 2.156,1.156 2.333,1.375 0.177,0.219 10 false 2 4.5,1.073 4.656,1.26 0.156,0.188 10 false 3 4.5,0.583 4.688,0.771 0.188,0.188 10 false 5 4.823,0.792 5.073,0.979 0.25,0.188 10 false TR 4.802,1.26 5.208,1.448 0.406,0.188 10 false SG-1 4.406,0.792 4.74,0.99 0.333,0.198 10 false E45 4.406,1.26 4.74,1.458 0.333,0.198 10 false E45

PROCEDURE

1.CLEAR DTC

Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs: 50002 450

Result:

Proceed to
NEXT

2.CHECK FOR DTC

Pre-procedure1

Turn the ignition switch off.

0.917,1.771 1.281,2 0.365,0.229 10 false *1 2.667,1.771 3.031,2 0.365,0.229 10 false *2 2.042,0.646 2.5,0.917 0.458,0.271 10 false TR 1.896,1 2.417,1.24 0.521,0.24 10 false SG-1

*1	Room Temp. Sensor (Cooler Thermistor)
*2	Air Conditioning Amplifier Assembly

Disconnect the room temp. sensor (cooler thermistor) connector.

Turn the ignition switch to ON and wait for 4 seconds or more.

Procedure1

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes: 50001 450

Result:

Result	Proceed to
B141A11 is not output	A
B141A11 is output	B

Post-procedure1

None

REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>ROOM TEMPERATURE SENSOR>REMOVAL202111,999999,_58,_111841,_0499801,RM100000001Z09I,

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

Pre-procedure1

Disconnect the E57 room temp. sensor (cooler thermistor) connector.

Disconnect the E45 air conditioning amplifier assembly connector.

Procedure1

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(E57,E45)Location & Routingewd_type=routing;type=c,c;code=E57,E45 Click Connector(E57)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Cooler Thermistor (Room Temperature Sensor)ewd_type=component;type=c;code=E57;pinno=1,2 Click Connector(E45)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assemblyewd_type=component;type=c;code=E45;pinno=5,3
E57-1 or E45-5 (TR) - Other terminals and body ground	Always	10 kΩ or higher
E57-2 or E45-3 (SG-1) - Other terminals and body ground	Always	10 kΩ or higher

Tester Connection

Condition

Specified Condition

Click Location & Routing(E57,E45)Location & Routingewd_type=routing;type=c,c;code=E57,E45

Click Connector(E57)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Cooler Thermistor (Room Temperature Sensor)ewd_type=component;type=c;code=E57;pinno=1,2

Click Connector(E45)Instrument Panel>Instrument Panel Wire / Radio Wiring Sub-Assy / Telephone Computer Wire>Air Conditioning Amplifier Assemblyewd_type=component;type=c;code=E45;pinno=5,3

E57-1 or E45-5 (TR) - Other terminals and body ground

Always

10 kΩ or higher

E57-2 or E45-3 (SG-1) - Other terminals and body ground

Always

10 kΩ or higher

Result:

Proceed to
OK
NG

Post-procedure1

None

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL202111,999999,_58,_111841,_0499808,RM100000001Z0AA,

REPAIR OR REPLACE HARNESS OR CONNECTOR