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If you mean the key less entry you simply need to take a paperclip and insert it in the #4 and #8 prongs on the diagnostic box located under the steering wheel, it will cycle the locks then just hold down the lock and unlock on the remote for 30 seconds and the test. Mr. Moose

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15y ago
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Q: How do you reprogram a 1999 Chevy Tahoe key?
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