![]() The sensor should change its resistance, modifying the control module's 5V signal. Enough to affect the photodiode, causing the voltage to increase. While monitoring the sensor's voltage, cover the sensor with something dark for a minute or so. Start the engine and run the air conditioning on MAX for a few minutes, until the passenger compartment cools down. My Autel now shows the car has a current (comes back after clearing) code for 'Sunload sensor. While it was in for the brake light switch recall this past week I had them check the climate control blend doors and actuators because of poor defog performance. The voltage reading on display should be low. My wife's '16 Impreza is still under warranty. With ignition on KOEO check voltage readings against specifications. View voltage readings in a capable scan tool datastream. As sunlight increases, the sensor's signal voltage decreases. Sun Load Sensor Test: It's on the dash usually close to the headlight sensor. If the sun load sensor fails, a fault code sets, and the program enters a default value and tries to achieve the desired temperature setting. If the sensor is covered with a dash cover or a window sticker, the control module receives inaccurate information and makes incorrect adjustments.ĮATC systems allow operators to set the desired temperature, and the system maintains that level of comfort. Resistance in the sensor increases as sun load increases. The sun load sensor contains a photodiode that's sensitive to sunlight. The (EATC) electronic automatic temperature control system uses the sun load and in-cabin temperature sensor inputs to adjust blower speed and improve passenger comfort. ![]()
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