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Here are the instructions straight from G.M.

1. Turn ignition off

2. Ground ALDL Terminal K (this is the lower row, 3rd from the right).

3. Turn ignition on (don't start engine)

4. Wait for fault codes to begin flashing (approx 5 seconds). When the codes begin flashing, unground ALDL terminal K for 3 seconds + or - 1/2 second.

5. After ungrounding ALDL K as described in step 3 above, ground it again for 3 seconds + or - 1/2 second.

6. Unground ALDL K and wait 10 seconds. Before turning the ignition OFF, verify that code 12 is the only code being flased (this is the seatbelt/air bag light flashing). If not, codes have not been properly cleared. Repeat from step one if codes not cleared until the codes clear.

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Wiki User

13y ago

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