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Car Security and Convenience / Power Door Locks, Single Wire Systems

With many single wire door lock systems, it's as simple as measuring the resistance of the wire(s) during lock and unlock to determine the value of the needed resistor(s). Others will require the addition of relays and / or diodes.

Single Wire Systems:
Nissan '91 - '95 option 1 - Type F
Nissan '91 - '95 option 2 - Type F
Ford Probe
Dodge Caravan (1996 - 2000)
Dodge Caravan (2001 - 2005)
top of page Nissan's Single Wire '91-'95 using 1 relay and 1 diode (Type F door lock)
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 wire is cut, or opened, the doors will lock. When this wire is grounded. the doors will unlock. If you have positive door lock outputs read next.
 
Nissan one wire door locks
 
top of page Nissan's Single Wire '91-'95 using 2 relays (Type F door lock)
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 wire is cut, or opened, the doors will lock. When this wire 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.
 
Nissan one wire door locks, 2 relays
top of page Dodge Caravan (1996 - 2000)
Locate the white w/green wire in the harness under the body control module. When ground is applied to this wire through a 1.5 K ohm resistor the doors will lock. When ground is applied to this wire through a 249 ohm resistor the doors will unlock.
 
Dodge Carvan door locks, 1996 - 2000
top of page Dodge Caravan (2001 - 2005)
Locate the purple/green wire in connector 3, pin 21 at the body control module. When ground is applied to this wire through a 5.3 K ohm resistor the doors will lock. When ground is applied to this wire through a 2 K ohm resistor the doors will unlock.
 
Dodge Caravan door locks, 2001 - 2005
top of page Ford Probe
Locate the single wire from the switch. When (+) 12 VDC is applied to this wire 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 wire with a diode and another diode to the unlock output with the cathodes of each towards the single lock/unlock wire.
 
Ford Probe door locks

Door Locks:
Determining Switch Types
Multiple Wire Systems
Add Auto Lock/Unlock
Single Wire Systems
Special Systems
Car Security and Convenience:
Basic Connections (inputs)
Basic Connections (outputs)
Car Alarm Modules
Car Alarm Sensors / Triggers
Door Locks
Light Flash / Illuminated Entry
Starter Interrupts
Accessories & Add-ons
Relays and Relay Diagrams:
SPDT and SPST Relays
Converting Polarity
Door Locks
Illuminated Entry & Light Flash
Special Applications
Starter Interrupts
Relay Diagrams - Quick Reference
Relay Forum


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Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

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