Car Security and Convenience / Power Door Locks, Special Wire Door Lock Systems

Home / Car Security and Convenience / Power Door Lock Types / Special Wire Systems

Special Wire Door Lock Systems:
• Double Pulse Unlock
• Single Pulse to Lock and Unlock
• Nissan Maxima 1995 - 1997 Door Locks
• Toyota with Child Safety Door Lock System

Single Pulse to Lock and Unlock

Using a mechanical latching relay like the PCB lacthing relay pictured below on the left and an SPDT relay, you can use a single negative output to alternately lock and unlock the doors. The mechanical latching relay only requires it's coil to be momentarily energized to change and maintain the opening or closing of it's contacts. The SPDT relay will provide a dedicated negative output for lock when the coil is energized and a dedicated output for unlock when it is not energized.

Nissan Maxima 1995 - 1997 Door Locks, Double Ground Pulse Relay Diagram

If this vehicle has a factory security system, a double ground pulse to the Green/Yellow (factory disarm wire) wire will unlock all doors. Brown wire will only unlock driver's door (alternating 12 V+). Pulse(-) to Lt. Green/Red will lock all doors.
95 - 97 Nissan Maxima Door Locks

Toyota with Child Safety Door Lock System

Locate the child safety wire in the same harness as the lock and unlock wires. This wire will be different colors (see below) in different models and will show ground until the lock from the switch is activated. This is a three wire system with an additional wire that must see ground during unlock for all of the doors to unlock. An additional relay may not be required. This will depend on the outputs of your unit. If not needed, connect the unlock output to the wires shown on terminal #30.
Toyota child safety door lock system

Child Safety Colors
	4Runner Camry / MR2 Celica Corolla Land Cruiser Tacoma Tundra	= = = = = = =	Red/Blue Blue/Red Green Blue/Red Blue/Orange Blue/Black Red/Yellow

Also see Requested Diagrams and Vehicle Information Database for child safety colors and other information not listed here.

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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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.