How to do a Relay Power Door Lock
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Power door locks have been around for many year, but manufacturers use different wiring schemes. One wiring scheme is resistive rest at ground, which has been used in the past by various manufacturers including Ford Motor Company. Resistive rest at ground is meant to keep both power door lock solenoids grounded, and then a positive pulse is applied when needed.
The power door solenoid or actuator is nothing more than a DC motor type component, which changes the direction of the lock actuation by reverse polarity. In other words, the door lock is actuated by reversing the polarity going to the solenoid. Here is where a relay becomes a very versatile controller of sorts.
Here’s how the circuit works:
Power is fed from the fuse to terminal 85 of the relay coil. This right away tells us that the relay actuation is going to be by ground, which is a lot safer. From the fuse, power is also fed to terminal 87 of the relay. This is a variation of how we normally connect terminal 30, which normally goes to power. But, not here where terminal 30 is used as an output. Terminal 87A is connected, on both relays, to chassis ground.
In this configuration, both relays connect the …. Get the whole story right here in this video…Enjoy…
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Post time: Jun-12-2017