Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The B10B Sun Load Temperature and Ambient Light and Security Indicator Sensor integrates the sunload sensor and passenger compartment temperature sensor into a single assembly.

The body control module provide the solar sensor a low reference circuit 407 and a signal circuit 590. As the sunload increases, the sensor signal voltage also increases and vice versa. The signal provided to the BCM varies between 1.2 - 4.85 V.

The passenger compartment temperature sensor is a negative temperature coefficient thermistor. The body control module provide the sensor a low reference circuit 407 and a signal circuit 734. As the air temperature increases, the sensor resistance decreases. The sensor signal varies between 0.1 - 4.8 V.

Bright or high intensity light can cause the vehicles interior temperature to increase. The HVAC system uses the sensor values and compensates for the increased temperature to maintain the system settings.