Toyota Corolla Cross: Room Temperature Sensor Circuit Short to Ground (B141A11)
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 |
|---|---|---|---|---|
| B141A11 |
Room Temperature Sensor Circuit Short to Ground |
Diagnosis Condition:
Malfunction Status:
Detection Time:
|
| Memorized |
WIRING DIAGRAM
PROCEDURE
| 1. |
READ VALUE USING GTS |
(a) 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.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) |
Actual cabin temperature displayed |
Cooler thermistor (room temperature sensor) circuit malfunction |
|
Tester Display |
|---|
| Room Temperature Sensor |
OK:
The display is as specified in the normal condition column.
| OK | .gif) | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
.gif)
| 2. |
INSPECT COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) |
Click here .gif)
| NG | | REPLACE COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) |
|
| 3. |
CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR (ROOM TEMPERATURE SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the I48 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I227-1 or I48-5 (TR) - Other terminals and body ground |
Always | 10 kΩ or higher |
|
I227-2 or I48-3 (SG-1) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
READ NEXT:
Room Temperature Sensor Circuit Short to Battery or Open (B141A15)
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 o
Servo Motor LIN Communication Bus off (B142A88)
DESCRIPTION The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation inst
Lost Communication with Air Inlet Damper Control Servo Motor LIN Missing Message (B143A87)
DESCRIPTION The air conditioning harness assembly and No. 1 air conditioning radiator damper servo sub-assembly connect the air conditioning amplifier assembly and the No. 1 blower damper servo sub-as
SEE MORE:
Front Passenger Side Door Entry Unlock Function does not Operate
DESCRIPTION If the entry unlock function does not operate for the front passenger door only, but the entry lock function operates, the request code is being transmitted properly from the front passenger door. In this case, there may be a problem related to the unlock sensor (connection between the c
Operation Check
OPERATION CHECK
CHECK NAVIGATION SYSTEM NORMAL CONDITION (w/ Navigation Function)
(a) If the cause of a symptom is any of the following, the corresponding
symptom is normal; it is not due to a malfunction.
Symptom
Answer
A longer route than expected is cho
