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How to Manually Disable the Anti-Theft System on a Buick LaCrosse?

2 Answers

AylaFitz

07/25/25 1:57am

Open the driver's side door of the Buick LaCrosse. Depress the brake pedal of the Buick LaCrosse. Press the one-touch start button of the Buick LaCrosse to start the engine. The dashboard will light up, indicating that the engine has been started. Press the unlock button of the Buick LaCrosse.

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StOmar

08/10/25 4:21pm

I've repaired many Buick vehicles, and the common manual method to disable the anti-theft lock is using the spare key. First, insert the key into the driver's door lock cylinder and turn it clockwise several times to the unlock position, which can stop the alarm. If that doesn't work, insert the key into the ignition switch, turn it to the ON position, and hold it for about 30 seconds to allow the system to recognize the key signal, then try starting the engine. The LaCrosse model has a particularly sensitive anti-theft system, making operations without a key more troublesome. A good practice is to rotate between two spare keys or regularly replace the remote battery as a precaution. If all else fails, it's best to contact professional services, as attempting to dismantle the system yourself could damage the module.

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