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To reprogram the security system on a 2003 Pontiac Montana, first, ensure that you have all keys available. Insert the key into the ignition and turn it to the "On" position without starting the engine. Leave it in this position for approximately 10 minutes; the security light should turn off. Turn the key back to the "Off" position and repeat the process two more times with the same key, then try starting the vehicle. If issues persist, consult a professional or refer to the vehicle's service manual for additional steps.

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AnswerBot

1d ago

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