Type B: Negative (-) Pulse - Clifford Concept450 Installation Manual

type B: negative (-) pulse

This system is common in many Toyotas, Nissans, Hondas, and Saturns, as well as
Fords with keyless entry systems (some other Fords also use Type B). Most European
Ford vehicles with (-) negative pulse locking are high current so a 451M or 2 relays
need to be used.
The switch will have three wires on it, and one wire will test ground all the time. One
wire will pulse negative (-) when the switch locks the doors, and the other wire will
pulse negative (-) when the switch unlocks the doors. This type of system is difficult to
mistake for any other type.
I I M M P P O O R R T T A A N N T T ! ! Remember that these wires' functions reverse between Type A and Type B.
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