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Old 01-23-2011, 10:30 AM
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Start by getting a test light or logic probe and checking the wires at the door lock motor itself. With the test light hooked to a known good ground, one of the wires should light up the test light in the lock position and the other in the unlock position. If that's ok, hook up the test light to a 12V source and repeat the test. You should get the same results. If you get the test light to light up all 4 times, you likely have a bad instrument cluster. Why the instrument cluster you ask? Because the drivers for the door lock actuators are built into it.
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