RM36D0EC _58 Vehicle Interior _083104 HEATING / AIR CONDITIONING _0402828 AIR CONDITIONING SYSTEM(for Gasoline Model) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  B141A15  Room Temperature Sensor Circuit Short to Battery or Open  


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 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
B141A15 Room Temperature Sensor Circuit Short to Battery or Open Diagnosis condition:

Ignition switch ON


Malfunction status:

Open or short to +B in room temperature sensor circuit


Detection time:

Continuously for 4 seconds or more


·

Cooler thermistor (room temperature sensor)

·

Harness or connector

·

Air conditioning amplifier assembly


Memorized

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis condition Ignition switch ON ○ ○
Malfunction Open in room temperature sensor circuit ○ -
Short to +B in room temperature sensor circuit - ○
Detection time Continuously for 4 seconds or more Continuously for 4 seconds or more
Trip Count 1 trip 1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored


WIRING DIAGRAM

E544599E02
0.083,1.802 0.417,2 0.333,0.198 10 false G60 0.083,1.969 2.969,2.25 2.885,0.281 10 false Cooler Thermistor (Room Temperature Sensor) 4.625,1.875 4.99,2.083 0.365,0.208 10 false G47 4.635,2.052 6.896,2.281 2.26,0.229 10 false Air Conditioning Amplifier Assembly 2.146,0.667 2.323,0.885 0.177,0.219 10 false 1 2.156,1.135 2.333,1.354 0.177,0.219 10 false 2 4.583,1.135 4.74,1.323 0.156,0.188 10 false 3 4.594,0.656 4.781,0.844 0.188,0.188 10 false 5 4.854,0.729 5.104,0.917 0.25,0.188 10 false TR 4.865,1.26 5.271,1.448 0.406,0.188 10 false SG-1 1.896,0.646 2.188,0.844 0.292,0.198 11 false + 1.917,1.125 2.167,1.313 0.25,0.188 10 false -

PROCEDURE

1.CHECK COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) CIRCUIT

Pre-procedure1

a.

Disconnect the cooler thermistor (room temperature sensor) connector.


Procedure1

b.

Measure the voltage according to the value(s) in the table below

Standard Voltage:
Tester Connection Switch Condition Specified Condition
G60-1 (+) - Body ground Ignition switch ON 0 to 5.5 V



Result:
Proceed to
OK
NG


Post-procedure1

c.

None



OK

2.READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

NG

4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER THERMISTOR (ROOM TEMPERATURE SENSOR))
2.READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)

Pre-procedure1

a.

Disconnect the cooler thermistor (room temperature sensor) connector.


b.

Connect terminals 1 and 2 of the cooler thermistor (room temperature sensor) connector on the wire harness side.

E446844C01
4.427,1.271 4.844,1.51 0.417,0.24 1.094,2.042 1.417,2.344 0.323,0.302 10 false *1 3.104,2.031 3.427,2.333 0.323,0.302 10 false *2 4.802,0.531 5.125,0.833 0.323,0.302 10 false *a 2.604,1.042 2.927,1.344 0.323,0.302 10 false TR 2.458,1.469 3.073,1.823 0.615,0.354 10 false SG-1 4.521,1.323 5.135,1.677 0.615,0.354 10 false G60
*1 Cooler Thermistor (Room Temperature Sensor) *2 Air Conditioning Amplifier Assembly
*a Front view of wire harness connector
(to Cooler Thermistor (Room Temperature Sensor)) 		- -



Procedure1

c.

According to the display on the GTS, read the Data List.

Body Electrical > Air Conditioner > Data List
Tester Display
Room Temperature Sensor
50003 450 100
OK:
GTS Display Specified Condition
Room Temperature Sensor 327.67°C (621.81°F)



Result:
Proceed to
OK
NG


Post-procedure1

d.

None



OK

REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR)

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


NG

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

Pre-procedure1

a.

Disconnect the G60 cooler thermistor (room temperature sensor) connector.


b.

Disconnect the G47 air conditioning amplifier assembly connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G60-1 (+) - G47-5 (TR) Always Below 1 Ω
G60-2 (-) - G47-3 (SG-1) Always Below 1 Ω



Result:
Proceed to
OK
NG


Post-procedure1

d.

None



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Pre-procedure1

a.

Disconnect the G60 cooler thermistor (room temperature sensor) connector.


b.

Disconnect the G47 air conditioning amplifier assembly connector.


Procedure1

c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
G60-1 (+) or G47-5 (TR) - Other terminals and body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG


Post-procedure1

d.

None



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR