21
3 Wire Negative Pulse Systems
This power doorlock system is simplest of all doorlocking systems. A Negative
pulse system will have only three wires at the switch.
Examine the wires on the back of the switch:
1) One wire will show (-)ground, regardless of the switch's position.
2) One wire will show (-)ground only when the switch is pushed to "lock".
3) One wire will show (-)ground only when the switch is pushed to "unlock".
Note: The lock & unlock wires coming out of the switch operate the vehicles
doorlock relays or a control unit with on-board relays, therefore the lock &
unlock wires will read voltage, up to (+)12 volts, when the switch is at rest. The
correct connection point is between the switches and the relays.
White/Black, Brown, & Pink
Wires Are Not Used
Doorlock
Switch
Control
Unit
Violet/Black & Violet
Wires To Ground
Green/Black Wire
To Switch Lock Wire.
Blue Wire To Switch
Unlock Wire.
Vehicle's Doorlock
Relay Control Unit
Unlock
Lock
745i
2
: USING ON-BOARD RELAYS
Ground
+
