This SAE Recommended Practice establishes a uniform procedure for assuring the manufactured quality, installed utility and performance of automotive products to the relocation, alteration, replacement, and/or extension of secondary controls and systems other than those provided by the vehicle manufacturer (OEM). These products are intended to provide driving capability to persons with physical disabilities. These products function as adaptive modifications to compensate for lost or reduced function in the extremities of the driver. These include, but are not limited to, the following: Cruise control; door locks; gear selector; hazard flasher; headlight beam selector; heater/vent/defroster/air conditioner (HVAC); horn; ignition/starter; light controls; mirrors; parking brake; power seats; turn signals; power window controls; and windshield wiper/washer; rear accessories (defogger, wiper/washer).