The battery in the key fob of a Volvo v70 is changed by opening the case with a penny or nickel. The battery can then be taken out and a new battery slid into position.
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Try to disconnect the battery for a few minutes.
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Disconnect the red battery wire then reconnect it.
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Battery Group is 47
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Disconnect the red battery cable. Wait a few moments and reconnect it.
the tailgate unlocks with the rear doors. Are your rear doors unlocking properly ? is your car battery weak ??