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The lock actuator contains a thermistor wired in series with a small DC motor. The thermistor will quickly heat up when the lock switch is pressed. This causes the resistance to also increase qucikly there by reducing the current flow to the motor. This is a protective function that prevents damage to the lock actuator if the switch is held down too long. It should function several times before the thermister begins to limit the current but over time these devices will weaken and limit the current too quickly. Some time to the point where the doors will not lock or unlock anymore. This requires the lock actuators be replaced. The old thermistor can be removed and a new installed but this takes some effort to find the correct current value thermister.

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โˆ™ 2008-08-14 02:30:36
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Q: Why dont the door locks work when you use them more then once on a 99 suburban?
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