S4 V8-4.2L (BHF) (2004)
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Remove nuts - 1 - and - 3 - from B-wires.
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Remove Battery Interrupt Igniter N253-item - 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.
NOTE: Observe disposal of pyrotechnic airbag units.
Installing
CAUTION: Battery Interrupt Igniters -N253 are pyrotechnic components. The same safety measures apply as with airbags. Observe safety
precautions for work on airbags.
Installation is reverse of removal, but note the following:
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When connecting electrical connector, ensure it engages securely and locking mechanism is OK.
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Follow the specified tightening torques.
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Switch on ignition.
CAUTION: No one should be in vehicle when connecting battery.
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Connect battery. Necessary measures.
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Follow measures after connecting battery.
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Finally, check DTC memory for airbag control module using and process if necessary.
Tightening torques
Component
Nm
Battery Interrupt Igniter N253 to current bar
9
B+ wire to Battery Interrupt Igniter N253
15