RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
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Clamp off ground wire at battery with ignition switched off.
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Remove left luggage compartment side trim.
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Loosen quick-release screws - 1 - and - 3 - and open flap - 2 - of main fuse box in luggage compartment - arrow -.
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Remove nuts - 1 - and - 3 - from B+ wires.
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Remove Battery Interrupt Igniter (N253) - 2 - from retainer.
CAUTION!
Before disconnecting electrical connection, technician must discharge electrostatic energy. To do this, briefly touch door lock, for
example.
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Disconnect electrical connector - 4 -.
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To do so, release connector lock - 2 - using a screwdriver until it stops - arrow -, this disengages the electrical harness connector - 1 - and it can be
disconnected.