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Check the SI for instructions on using the TECH-2 and SPS to reprogram the HVAC module. Battery replacement should NOT require doing this, however. Replacing the battery will, however, require recalibration of the HVAC doors if you screw it up by completely discontinuing supply of 12V.

Luckily, it's easy to recalibrate because the GM guys know what kind of idiots they have to dea shiat happens. Anyway, disconnect the battery, with the key in your pocket. WEait ten minutes, ne less. Ten reconnect the battery, turn the key to ON (be sure you know what ON means) and wait another two minutes, then shut it off, start the engine, and set the clock, radio, and compass.

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17y ago

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