B1421 LEXUS, TOYOTA, SCION: SOLAR SENSOR CIRCUIT PASSENGER SIDE
POST UPDATED IN June, 2023
B1421 LEXUS, TOYOTA, SCION: SOLAR SENSOR CIRCUIT PASSENGER SIDE
The Sun Sensor is a device installed on the top of the instrument panel. Its function is to detect sunlight to control the AUTO mode of the Air Conditioning system. The output voltage of this sensor changes according to the amount of sunlight. When the light increases, the output voltage increases accordingly. If the light decreases, the output voltage decreases accordingly. On the other hand, the air conditioning amplifier detects all these voltage changes.
The DTC B1421 OBDII code is set because a fault was detected in the passenger side Solar Sensor circuit.
Reasons for setting diagnostic code B1421 OBD2:
To solve the B1421 OBDII fault code, try to follow these steps: