B1259 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1259 – Solar Radiation Sensor Circuit Open
B1259 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1259 Possible Causes
Faulty Solar Radiation Sensor,Solar Radiation Sensor harness is open or shorted,Solar Radiation Sensor circuit poor electrical connection,Faulty Electronic Automatic Temperature Control (EATC) Module
Under normal operation, the solar radiation sensor receives a ground through the circuit. A 5-volt reference voltage is supplied to the solar radiation sensor from the Electronic Automatic Temperature Control (EATC) Module through. The EATC Module monitors the Solar Radiation Sensor. The EATC Module sets the OBDII code when the Solar Radiation Sensor is not to factory specifications.