The In-Car Temperature Sensor measures the temperature of the passenger compartment. The voltage signal is delivered to the HVAC control unit. This information is used to control the vent output temperature.
DTC B1234 sets if In-Car temperature sensor signal is at or over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage check | 1. Open in signal circuit. 2. Short to battery in signal circuit. 3. Faulty In-Car temperature sensor. 4. Faulty A/C Control Unit. |
Enable Conditions |
•
Ignition ON | |
Threshold value |
•
Sensor signal is at or over 4.9V for 0.3 seconds. | |
Failsafe |
•
Substituded In-Car Temp. = 25℃ (77℉) |
※ Resistance value of incar temp sensor as a function of temperature.
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-20/-4 | 285.6 | 20/68 | 37.4 |
-10/14 | 169 | 30/86 | 24.1 |
0/32 | 97.7 | 40/104 | 15.9 |
10/50 | 59.67 | 50/122 | 10.8 |
