DTC B1A85-96: Ambient Light Sensor - Component internal failure: Action

NOTE: This DTC may be stored even though no fault condition is present and should be ignored unless the customer has reported an instrument cluster brightness concern. If the customer has reported an interior illumination problem, clear the DTC and retest. Verify the customer concern prior to diagnosis

Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest.
If the fault persists, install a new instrument cluster