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In Reply to: Yikes.. how does it work? posted by Chuck in Boston on October 15, 2001 at 07:09:00:
THE CENTRAL LOCKING SYSTEM IN BRIEF (US MODELS, 1986)
Here are the components:
-Central locking control unit above the speaker in the passenger's footwell.
-Lock motors at each door, the trunk, and the gas filler door. The door motors have a deadbolt in each unit. The driver's deadbolt is manually operated by turning the key. The others are electrical.
-Lock/unlock switches at the front doors and trunk (all integral with the lock motors).
-An unlock inhibit (deadbolt) switch at the driver's door.
The central locking unit does the following:
-Monitors the driver's lock, the front passenger's lock, and the trunk lock to see if someone is trying to lock/unlock the car. All these signals are wired together, so the unit sees a single "lock request" wire and a single "unlock request wire." (The trunk lock uses separate wires, but they are connected to the others inside the control unit, so it can't tell the difference.)
-Monitors the deadbolt switch so it knows whether to engage the deadbolt system and whether to monitor the unlock request signal.
-Tells ALL the lock motors to lock or unlock. They are all wired together, so it can only tell them all to lock or unlock. That doesn't mean they do, it just means that's what they're told to do.
When you lock/unlock the car using the key or front door buttons, the control unit sees that and tells all the motors to lock/unlock.
When you turn the driver's lock to the deadbolt position, the car locks itself (as you turned the key through that position) and then engages the electric deadbolt in the other three doors.
When you unlock the car, the inhibit switch grounds the deadbolt input on the motors, which withdraws the deadbolt.
The way the deadbolt switch actually works in conjunction with the motors is truly strange, and I recommend having the ETM in front of you to explain it.
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