Door Lock & Unlock System

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Door Lock & Unlock System

Here i am going to discuss the car's locking and unlocking system.

It is very easy to install and configure. with less knowledge of electric circuits one can easily design it.

For an example of this all article i will quote toyota's example with different models.

(now sit back and relax, pics are being uploaded) :p

Gari.pk User 4109 asked on 13 Jul 2010 13:39:41 pm

1 Answer

287 views |

Mohsin - on 13 Jul 2010 13:39:54 pm

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.

You can find a relay of this kind easily from any electronics market like hall road.

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.