US Patent 7106068 Exterior lamp check for motor vehicles

An automated system for cycling vehicle lamps on and off allows direct inspection by one person of operability of the lamp bulbs while doing a walk around of the vehicle. The system is switch operated. Interlocks to operation are based upon the status of the vehicle's service brake, its park brake and the on/off status of the lights themselves. Lights are organized by related groups and each group given a distinctive, repeating cycle to lighten the burden of memorization on the operator.