B1421 LEXUS – Solar Sensor Circuit Passenger Side

B1421 LEXUS Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B1421 LEXUS Possible Causes

Faulty Solar Sensor,Solar Sensor harness is open or shorted,Solar Sensor circuit poor electrical connection,Faulty Air Conditioning Amplifier

B1421 LEXUS Description

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning AUTO mode. The output voltage from the solar sensor varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The Air Conditioning Amplifier detects changes in the output voltage from the solar sensor.