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How to add 2nd key to Chevrolet Trailblazer 2003

1
To identify the system please look at the key in attachment. 
The car is made for export (dash in km).
Tried "waiting" method without success.

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2
30 minute relearn should work on this, no mention in service data of exports.

Make sure you have the correct key blank with the proper chip and follow the 30 minute relearn to the letter.

Monitor the timer with a scantool, if it never changes this one might be SPS only and the service info for exports is missing.
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