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DOORLOCK CONNECTIONS
The vast majority of power doorlocks are found as three system types: 3 wire negative pulse, 3 wire positive pulse and 5 wire reversal, rest at ground. Other
power doorlock systems which may be encountered are the vacuum pump types found in most Mercedes vehicles and the single wire, dual-voltage which has
appeared in some late model vehicles. The best way to identify a doorlock system is to examine the doorlock switch's wiring. The following sections will discuss
the types of doorlock systems found and the available optional interfaces.
3 Wire Negative Pulse Systems: This power doorlock system is indicated by the presence
of three wires at the switch. Of these, one will show constant ground, regardless of whether the switch
is being operated or not (at rest). Of the remaining two wires, one will show ground when the switch
is pushed to the "lock" position, and the other wire will show ground when the switch is pushed to
the "unlock" position. With the switch at rest, 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
or control unit.
An optional harness is available (model DLP-N3) which allows direct connection between the
security system and 3 Wire Negative Pulse doorlock systems. Some doorlock systems, however,
require more than the 500ma ground output that the security system's control module can
accommodate. In these cases the optional model DLS and two relays must be used. When driver's
door unlock priority is desired, the correct interface is the DLS-3.
3 Wire Negative Doorlocks
With The Optional
DLS And 2 SPDT
Relays
Relay
DLS Violet Wire To Ground
DLS Green Wire
To Door Lock Wire.
Ground
Doorlock
Switch
EG-1800
ATV
SUPPLEMENT
Relay
DLS Connector
DLS
Plugs Into Alarm
DLS Blue Wire To
Door Unlock Wire.
Unlock
Lock
Vehicle's Doorlock
Relay Control Unit
3 Wire Positive Pulse Systems: This power doorlock system
is very similar to the three wire negative pulse system except the
Doorlock
vehicle's doorlock switches use 12 volt positive pulses to operate the
Actuators
vehicle's doorlock relays or control unit. Examine the wires on the
+
+
back of the switch. Of the three wires, one will be constant 12 volt
positive, regardless of the switch's position. Of the two remaining
wires, one will show 12 volt positive when the switch is pushed to
"lock", and the other will show 12 volt positive when the switch is
pushed to "unlock". Since the security system's output polarity
must be reversed from negative ground to 12 volts positive, an
optional doorlock interface must be used. Three interfaces are
available - the models DLP-P3, the DLS and the DLS-3 with
optional SPDT relays. The DLS-3 is discussed in detail later.
Page 63
Blue Wire To Vehicle Unlock Wire
Green Wire To Vehicle Lock Wire
Model DLP-N3 -Three pin connec-
tor with two 24" wires. Allows direct
connection of the security system's
negative pulse outputs directly to a
vehicle's negative pulse doorlocks or
to facilitate custom hard-wiring of op-
tional relays.
Doorlock Connections
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