Originally posted by simon_c
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^Scott repairs the GM5 'general module' among other things. If you have intermittent issues locking or unlocking via key and/or inside button, it's likely the GM5. In my case over the last 10 years I had intermittent issues unlocking passenger on second click, then last year or two it stopped unlocking either door ever. Had to use physical key or roll down window and grab interior handle. $120 for GM5 repair (some internal relays that go bad or something) and works perfect now. Some of the best money I've spent on the car. GM5 also controls power windows, wipers, etc. but I believe it's most common to have intermittent issues unlocking car
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