Some car door lock diagrams include vacuum type, single wire and multiple wire door lock diagrams. Keyless lock diagrams, reverse polarity and actuator diagrams are some other types.
Diagrams for keyless entry systems and automatic car locks without alarms are often used in cars with power locking systems that use the auto lock feature. Vacuum type locks are used with single wire lock diagrams, and they change polarity to lock and unlock. Multiple wire door lock diagrams are further categorized into three-wire, four-wire and five-wire car lock systems. Also commonly used care lock diagrams are four-wire reversal five-wire alternating positive diagrams. Three-wire and five-wire car door locks may be negative or positive, with diagrams available for both systems.