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To reset the Passlock security system on a 1999 Tahoe, first ensure that the vehicle is in the "Off" position. Then, turn the ignition to the "On" position without starting the engine and wait for about 10 minutes until the security light turns off. Next, turn the ignition back to "Off," and then to "On" again for another 10 minutes. Repeat this process a couple of times if necessary, and the system should reset, allowing the vehicle to start.

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1w ago

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