How To Test For 5 Wire Door Locks

Single wire door lock systems type f type g type h there may be one two or three wires in the harness not counting the illumination wire s if any and only changes in voltage and or resistance on one wire to lock and unlock. Step 2 activate the power lock switch to its lock and unlock positions while listening for a distinctive click sound coming from the relay. Check the fuses and circuit breakers especially if none of the power door locks work.

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Except at the switch in this case both motor legs rest at ground.

How to test for 5 wire door locks.

How to wire automotive spdt relays. 5 wire door locks are a bit more complicated. While the switch is off both wires lock and unlock are grounded. When the switch is pushed for example to the unlock position the unlock wire gets disconnected from the ground and connected to 12v activating the actuator.

Some of these will open a circuit to lock and ground a wire to unlock. If you cannot hear the click go to the next step. Door locks 5 wire alternating 12 volts positive type c. The switch when moved in either direction applies both power and ground directly to motor legs without the use of any relays.

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