| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000028C3O |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): B141A15; Room Temperature Sensor Circuit Short to Battery or Open; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ] | ||
|
DTC |
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 (5 V) 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:
Malfunction:
Detection Time:
|
|
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
PROCEDURE
|
1. |
READ VALUE USING GTS (ROOM TEMPERATURE SENSOR) |
(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 |
Room temp. sensor (cooler thermistor) |
-327.68 to 327.67°C |
Actual cabin temperature displayed |
Room temp. sensor (cooler thermistor) circuit malfunction |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
|---|
|
Room Temperature Sensor |
OK:
The display is as specified in the normal condition column.
| OK |
|
|
|
2. |
INSPECT ROOM TEMP. SENSOR (COOLER THERMISTOR) |
Click here
![2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - ]; HEATING / AIR CONDITIONING: ROOM TEMPERATURE SENSOR: INSPECTION](/t3Portal/stylegraphics/info.gif)
| NG |
|
|
|
3. |
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 I48 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 - I48-5 (TR) |
Always |
Below 1 Ω |
|
I36-2 - I48-3 (SG-1) |
Always |
Below 1 Ω |
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I48-5 (TR) - Body ground |
Ignition switch ON |
Below 1 V |
|
I48-3 (SG-1) - Body ground |
Ignition switch ON |
Below 1 V |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|