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VM9311
Disconnecting the Battery
To prevent a short circuit, be sure to turn off the ignition and
remove the negative (-) battery cable prior to installation.
NOTE: If the VM9311 is to be installed in a car equipped
with an on-board drive or navigation computer, do not
disconnect the battery cable. If the cable is
disconnected, the computer memory may be lost. Under
these conditions, use extra caution during installation to
avoid causing a short circuit.