Abstract: An interlock for a vehicle platform lift meets the Federal Motor Vehicle Safety Standards (FMVSS 403) effective in late 2004 with minimum modification of vehicle electronic control arrangements. The interlock prevents forward and rearward mobility of vehicles unless the platform lift is stowed. The interlock operates to prevent accidental release but does not affect vehicle movement when the platform lift is stowed. Operation of the lift is allowed by placing the transmission in park or by placing the transmission in neutral and actuating the parking brake. A vehicle body computer controls operation when the vehicle is running. A bypass enable relay allows use when the vehicle's engine is not running.