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The best way to identify a doorlock system is to examine the doorlock switch's
wiring . The names of the three systems are in fact derived from the number
of wires, and their polarity, as found at the doorlock switch, although
variations can be encountered*.
* These "variations" include illuminated switches, which will have more than
the described number of wires, and "multiple switch assemblies" which have
Power and/or Ground "bussed" internally, and therefore appear to have less
than the described number of wires.
3-Wire Negative Systems:
vehicle's doorlock switch activates "lock" and "unlock" relays present in the
vehicle, which can be found separate, within a bank of relays, or sometimes
within a doorlock control unit. This power doorlock system is indicated by
the presence of three wires at the switch. Typically, of the three wires at the
switch:
- One wire is constant Ground.
- One wire shows Ground when the switch is pushed to "lock".
- One wire shows Ground when the switch is pushed to "unlock".
With the switch at "rest" (not being operated), these two wires will read
voltage, usually 12 volt positive but in some cases less. The wires from the
switches operate doorlock relays or a doorlock control unit with built-in
relays; the correct connection point is
between the switches and the relays.
Diagram Of A Typical 3 Wire
Negative Doorlocking System
Doorlock
Switch
Ground
"Unlock" wire
"Lock" wire
Interface performed
within in this area
Page - 20
In 3 Wire Negative systems, the
Doorlock
Actuators
Vehicle's Doorlock
Relay Control Unit
Unlock
Lock
+
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