Engine-Codes - Toyota - B1412 Toyota

B1412 Toyota Code - Ambient Temperature Sensor Circuit

- Code Popularity: 15,351 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B1412 Toyota?

  • 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 B1412 Toyota Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code B1412 Toyota Tech Notes

User Submitted Video

|What is the Cost to Diagnose the Code B1412 Toyota?

Labor: 1.0

The cost to diagnose the B1412 Toyota code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your car have Safety Recalls? → Check here

|What are Code B1412 Toyota Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B1412 Toyota Code Mean?

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. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the Cooler Thermistor (Ambient Temperature Sensor) changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
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.

Ambient Temperature Sensor Circuit

|Need more Information on the B1412 Toyota Code?

Need more information on how to fix the B1412 Toyota code? Get Access to Factory Service Manuals

|Code B1412 Toyota Information for Specific Toyota Models

|Need Help with the B1412 Toyota Code?

Get the B1412 Toyota code diagnosed by a professional: Find a repair shop in your area