Directed Electronics READY REMOTE 24927, Owner'S Installation Manual

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29 © 2 0 0 7 D i r e c t e d E l e c t r o n i c s
Type A: Three-wire (+) pulse controlling factory lock relays
The system can control Type A door locks directly, with no addi-
tional parts. The switch will have three wires on it; one will test
(+)12 volt constantly. The others will alternately pulse (+)12 volt
when the switch is pressed to the lock or unlock position.
If you cannot get to the switch, and you find a set of wires that
pulse (+)12 volt alternately on lock and unlock, make sure that it
is not a Type C direct-wire system.
Here is a test: Cut the wire that pulses (+)12V on lock, and then
operate the switch. If the locks stop working, then you have the
correct wire.
Many GM vehicles use Type A locks. However, some GM vehicles are
Type C. This system usually appears in older GM vehicles (1980-
1995). The full-size pickups (1989-up), many of the Blazers, the
Corvette, 1995 Cavalier/Sunfire 1993, and the newer
Camaro/Firebird, all use Type C door locks, and cannot be
controlled without relays.
Almost all newer Fords are Type B. Ford builds no Type A systems.
Chrysler now uses multiplex door lock systems (Type G or H) that
require relays and resistors to properly interface the circuit.