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I'm not familiar with the '89's additional feature (see B.C's post) but the locks are controlled by two switches. One wraps around the key lock, the other is actuated by the pull knob.
Each switch has 3 wires to it (common, lock, unlock). So if any of those wires are broken you'll have problems. You'll need to pull the door panel on the drivers side to examine the wires (blk, red, grn).
I disabled my key actuated switch as I didn't like all doors opening when I turned the key. If I want to open/close all doors, I just use the driver's side knob.
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1980 245 Canadian B21A with SU carb and M46 trans
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