How To Do KEYPAD Self-test for GM Tech2

Here the following is the picture for gm tech2 keypad self-testing

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Here the picture is to test F0 key, key Pressed status:
pass means F0 key is working. You have to
one-by-one test
F0-F1-F2-F3-F4-F5-F6-F7-F8-F9-EXIT-ENTER-?
Don’t skip any of one key.

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