Headlights problems of the 2004 Lexus ES330

The contact owns a 2004 Lexus ES 330. While parked, the contact noticed that the driver side headlight was not illuminated. The contact stated the driver and passenger headlight would intermittently fail but both had never failed simultaneously. The contact replaced the headlight bulbs yet the failure persisted. The vehicle was taken to the dealer for diagnostic testing where the technician advised that two computers that controlled the exterior lighting and the headlights would have to be replaced. The vehicle was repaired. The approximate failure mileage was 90,000.