Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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lemon-manuals.org.ua
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Compass: Testing and Inspection
Electronic Compass Module Programming and SetupThe electronic compass module requires a calibration after the module is replaced, repaired, or as required for proper module operation. Refer to
Compass Calibration and Magnetic Variance (without OnStar Only)
Description and Operation.