DTC B141A-15: Room Temperature Sensor Circuit Short to Battery or Open [08/2023 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
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 | MIL | Memory | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| B141A-15 | Room Temperature Sensor Circuit Short to Battery or Open | Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Does not come on | Memorized | Air Conditioner | A | - |
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.