B1412 Code - Ambient Temperature Sensor Circuit
Quick Answer
The Cooler Thermistor (Ambient Temperature Sensor) is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioning system AUTO mode. Common causes include Faulty Cooler Thermistor (Ambient Temperature Sensor), Ambient Temperature Sensor harness is open or shorted, Ambient Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1412 indicates Ambient Temperature Sensor Circuit.
- Common causes
- Common causes include Faulty Cooler Thermistor (Ambient Temperature Sensor), Ambient Temperature Sensor harness is open or shorted, Ambient Temperature Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1412 Description
The air conditioning amplifier assembly applies a voltage (5 V) to the Cooler Thermistor (Ambient Temperature Sensor) and reads voltage changes due to changes in the resistance of the Cooler Thermistor (Ambient Temperature Sensor). The combination meter assembly sends the read signal to the air conditioning amplifier via CAN communication.
The Diagnostic Trouble Code (DTC) will be set when the Air Conditioning Amplifier Assembly detects an open or short in the Cooler Thermistor (Ambient Temperature Sensor) circuit.
What are the Possible Causes of the DTC B1412?
- Faulty Cooler Thermistor (Ambient Temperature Sensor)
- Ambient Temperature Sensor harness is open or shorted
- Ambient Temperature Sensor circuit poor electrical connection
- Faulty Air Conditioning Amplifier Assembly
How to Fix the DTC B1412?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1412 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B1412 code?
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Need Help with the Code?
Get the B1412 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B1412 Lexus — Ambient Temperature Sensor Circuit
- B1412 Scion — Ambient Temperature Sensor Circuit
- B1412 Toyota — Ambient Temperature Sensor Circuit
Frequently Asked Questions about B1412 Code
1. What are the common symptoms of OBDII code B1412 (Ambient Temperature Sensor Circuit)?
- Common symptoms include inaccurate readings of the outside temperature displayed on the vehicle's dashboard, erratic temperature fluctuations, or a complete failure of the ambient temperature display.
2. What are the possible causes of OBDII code B1412?
- The code B1412 can be triggered by a faulty ambient temperature sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning temperature sensor module.
3. How can I diagnose the issue related to OBDII code B1412?
- To diagnose the issue, you can start by visually inspecting the sensor and its wiring for any visible damage. Using a multimeter, you can also test the resistance of the ambient temperature sensor to determine if it is within the specified range.
4. Can I still drive my vehicle with OBDII code B1412 active?
- It is generally safe to drive the vehicle with the B1412 code, but you may experience inaccuracies in the displayed temperature readings. It is recommended to address the issue promptly to avoid any potential complications.
5. How can I repair OBDII code B1412?
- Repairing the B1412 code may involve replacing the ambient temperature sensor, repairing or replacing damaged wiring or connectors, or addressing any issues with the temperature sensor module.
6. Are there any DIY tips for fixing OBDII code B1412?
- If you are comfortable with automotive repairs, you can attempt to replace the ambient temperature sensor yourself by following the vehicle's service manual or online guides. However, if you are unsure, it is best to seek professional help.
7. Will resetting the OBDII system clear the B1412 code?
- Resetting the OBDII system may temporarily clear the B1412 code, but if the underlying issue is not addressed, the code is likely to reappear. It is recommended to diagnose and fix the root cause of the problem.
8. Can extreme weather conditions affect the ambient temperature sensor circuit?
- Yes, extreme weather conditions such as extreme heat or cold can potentially impact the ambient temperature sensor circuit and lead to issues like the activation of OBDII code B1412.
9. Is the ambient temperature sensor circuit essential for vehicle performance?
- While the ambient temperature sensor circuit does not directly affect the performance of the vehicle, it plays a crucial role in providing accurate temperature readings for various vehicle systems and driver information.
10. Can a faulty ambient temperature sensor affect other vehicle systems?
- Yes, a faulty ambient temperature sensor can impact other vehicle systems that rely on temperature data, such as the climate control system, automatic headlights, and engine performance under certain conditions.
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