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Window regulators are a very common problem on these. Might as well replace the whole unit if it's bad, motor and all. The motors are cheap, and wimpy.
Be sure to check the switch first though.
The circuit breaker replaces two limit switches. It kicks out if you hold the button down, going up or down. It will also kick (or should) if something gets stuck in the window while it's going up.
With no relays, it just uses a single, double pole, double throw switch. It just makes a + to +, and a- to - connection going up, and then reverses polarity going down.
Sniper has the diagnostics right. Either way, the door panel comes off to check it, or replace it.
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