Vision 1330B, Owner'S Manual, Page: 41 / 48

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TYPE-A Most American-made vehicles use (+) Positive control “Type A”
door locks. Type-A vehicles have 3 wires at the master door lock switch.
Probe the 3 wires and you should find one constant (+)12v wire, and the
other two wires will show (+)12v only when the switch is pressed. The 1330
can interface with Type-A only with the use of an optional VISION 318-16U
door lock interface module.
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Type-C systems are very similar to Type-A. Mix-
ing up the two types could damage the vehicle. To test, cut the wire that
shows (+)12v when you press the Lock switch. Next, press the Unlock
switch and see if all the doors unlocked. If all the doors unlocked, you
can safely proceed with a Type-A installation. If the doors did not un-
lock, you either cut a motor wire or you have a Type-C system.
TYPE-C Like Type-A locking systems, Type-C lock and unlock wires typi-
cally show (+)12v when you press the door lock switch. However, Type-C
systems lack factory relays, and power is sent directly from the switch to
the door lock motors. Pushing the lock switch reverses the electrical po-
larity on the door lock motors according to the switch you pressed—so the
polarity on the motor for Lock is opposite the polarity on the motor for Un-
lock. When neither switch is pressed, the lock and unlock wires typically
rest at (–) ground. The 1330 can interface with Type-C only with the use of
an optional VISION 318-16U door lock interface module.
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FIG-5: Connecting (–) Ground Control Door Locking
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