Jetta III L4-2.0L (ABA) (1995)
Speaker: Service Precautions
CAUTION: Before working on the electrical system:
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Determine the correct coding for the anti-theft radio.
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Disconnect the battery Ground (GND) strap.
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Be sure the ignition is switched OFF (also applies when connecting the battery). Failure to do so may damage the Engine Control Module (ECM).
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Disconnecting the battery causes the basic setting of the ECM to be erased. This may result in driveability problems.