Will disconnecting a battery affect the central locking?

2000 FORD FOCUS
117,000 MILES
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NIGS
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I have a ford focus (yr=2000).
I have been told that if I disconnect the battery to replace a reverse switch, the central locking may not work when I reconnect the battery.
Is this true?
I also need to identify the correct revers switch as there appears to be 3 different ones.
Jul 30, 2012 at 9:49 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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