With many it's as simple as measuring the resistance of the lead(s) during
lock and unlock to determine the value of the needed resistor(s). Others will
require the addition of relays and / or diodes.
More Coming Soon !
Nissan's Single Wire '91-'95 using 1relay and 1 diode On the '91-'95 300ZX and the '92-'95 240SX, locate the lock/unlock wire in the driver's
kick panel or door jamb. When this lead is cut, or opened, the doors will lock. When this lead is
grounded. the doors will unlock. If you have positive door lock outputs read next.
Nissan's Single Wire '91-'95 using 2 relays On the '91-'95 300ZX and the '92-'95 240SX, locate the lock/unlock wire in the driver's
kick panel or door jamb. When this lead is cut, or opened, the doors will lock. When this lead is
grounded. the doors will unlock. If you have positive door lock outputs from the alarm or keyless
entry, connect the sides of the coils shown connected to (+)12 VDC to ground and the positive
door lock outputs to the respective terminals of the relays.
Ford Probe Locate the single wire from the switch. When (+) 12 VDC is applied to this lead the doors
will lock. When (+) 12 VDC is applied through a 4.7 K ohm resistor, the doors will unlock. If your alarm
or keyless entry has positive outputs, connect the resistor in series to the lock output lead with a diode
and another diode to the unlock output with the cathodes of each towards the single lock/unlock wire.
Dodge Caravan Locate the white w/green wire in the harness under the body control module. When ground
is applied to this lead through a 1.5 K ohm resistor the doors will lock. When ground is applied to this lead
through a 249 ohm resistor the doors will unlock.
