AC–36 AIR CONDITIONING SYSTEM – TROUBLESHOOTING Blinking Light DEF Solar Sensor Circuit CIRCUIT DESCRIPTION A photo diode in the solar sensor detects solar radi– ation and sends signals to the A/C amplifier. Resistance of photodiode High Low Weak Strong Strength of solar radiation Diagnostic Sensor Check Detecting Condition Trouble Area Open or short in solar sensor circuit. Please not that blinking of the LED for DEF is not abnormal when the sensor is not receiving solar radiation. • Solar sensor • Harness or connector between solar sensor and A/C amplifier • A/C amplifier WIRING DIAGRAM A/C Amplifier 5 V BR-W 2 A13 S5 Solar Sensor 2 1 Y-G 17 A13 TS V-W 9 ← – – A13 SG NO8813