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Locate the ALDL under the DS dash to the right of the steering wheel.
Remove the cover (if still there), use a bent paper clip legs to jumper Pins A&B (two upper right).
Turn On the ignition key (do NOT start the engine).
Count the SES flashes: you will see three "12"s followed by each code flashed three times, ending with three "12"s.
Turn Off the ignition key.
Remove the paper clip.
Install the ALDL cover.