DTC B1A85-11: Ambient Light Sensor - Circuit short to ground: Action

NOTE: The rain/light sensor and circuits are integral to the touch screen switchpack

Clear the DTCs and re-test. Using the manufacturer approved diagnostic system, check datalogger signal - Ambient light sensor (0x721C). Check that the voltage decreases when the sensor is covered and increases when a light source is directed into the sensor. If the sensor voltage does not change with varying light intensity install a new touch screen switchpack