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

Home / Car Security and Convenience / Power Door Lock Types / 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 - (Type G)
• Dodge Caravan (1996 - 2000) - (Type H)
• Dodge Caravan (2001 - 2005) - (Type H)

Nissan's Single Wire '91-'95 using 1 relay and 1 diode (Type F)

Nissan's Single Wire '91-'95 using 2 relays (Type F)

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

Dodge Caravan (1996 - 2000) Single Wire Door Lock (Type H)

Dodge Caravan (1996 - 2000) (Type H)

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

Dodge Caravan (2001 - 2005) Single Wire Door Lock (Type H)

Dodge Caravan (2001 - 2005) (Type H)

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

Ford Probe Single Wire Door Lock (Type G)

Ford Probe (Type G)

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 Wiring 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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