RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0598792 AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE)) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE))  B141A15  Room Temperature Sensor Circuit Short to Battery or Open  


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

Ignition switch ON


Malfunction:

Open or short (+B) 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

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Ignition switch ON ○ ○
Malfunction Open in room temperature sensor circuit ○ -
Short (+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

E546056E35
0.198,1.802 0.531,2 0.333,0.198 10 false I36 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 4.458,1.073 4.688,1.292 0.229,0.219 10 false 23 4.49,0.573 4.677,0.76 0.188,0.188 10 false 4 4.823,0.781 5.073,0.969 0.25,0.188 10 false TR 4.813,1.26 5.219,1.448 0.406,0.188 10 false SG-1 4.438,0.792 4.771,0.99 0.333,0.198 10 false I49 4.438,1.26 4.771,1.458 0.333,0.198 10 false I49

PROCEDURE

1.CHECK ROOM TEMP. SENSOR (COOLER THERMISTOR) CIRCUIT
a.
E546065C10
1.479,0.25 1.896,0.5 0.417,0.25 0.208,0.198 0.521,0.396 0.313,0.198 10 false *a 1.594,0.302 1.906,0.5 0.313,0.198 10 false I36
*a Front view of wire harness connector
(to Room Temp. Sensor (Cooler Thermistor))


Disconnect the I36 room temp. sensor (cooler thermistor) connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I36-1 - Body ground Ignition switch ON 0 to 5.5 V


Result:
Proceed to
OK
NG




OK

2.CLEAR DTC

NG

5.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ROOM TEMP. SENSOR (COOLER THERMISTOR))
2.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Air Conditioner > Clear DTCs
50002 450

Result:
Proceed to
NEXT



NEXT

3.CHECK FOR DTC
3.CHECK FOR DTC
a.

Turn the ignition switch off.


b.
E546065C10
1.479,0.25 1.896,0.5 0.417,0.25 0.208,0.198 0.521,0.396 0.313,0.198 10 false *a 1.594,0.302 1.906,0.5 0.313,0.198 10 false I36
*a Front view of wire harness connector
(to Room Temp. Sensor (Cooler Thermistor))


Disconnect the I36 room temp. sensor (cooler thermistor) connector.


c.
E478811C15
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 2.031,0.646 2.49,0.917 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


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


d.

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


e.

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes
50001 450
Result:
Result Proceed to
B141A11 is output A
B141A15 is output B




A

REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR)

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


B

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

Disconnect the I36 room temp. sensor (cooler thermistor) connector.


b.

Disconnect the I49 air conditioning amplifier assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I36-1 - I49-4 (TR) Always Below 1 Ω
I36-2 - I49-23 (SG-1) Always Below 1 Ω


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

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

Disconnect the I36 room temp. sensor (cooler thermistor) connector.


b.

Disconnect the I49 air conditioning amplifier assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I36-1 or I49-4 (TR) - 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