Audi A4 Owners & Service Manuals

Audi A4: Battery Interrupt Igniter

Audi A4 (B9) 2016-2025 Service Manual / Body / Body Interior / Passenger Protection, Airbags, Seat Belts / Battery Interrupt Igniter

Overview - Battery Interrupt Igniter

Overview - Battery Interrupt Igniter

1 - Connector

  • For the Battery Interrupt Igniter -N253-

2 - Nuts

  • Tightening specification. Refer to → Electrical Equipment; Rep. Gr.97; Relay Panels, Fuse Panels, E-Boxes; Component Location Overview - Relay Panels, Fuse Panels, E-Boxes.

3 - Battery Interrupt Igniter -N253-

  • Available only together with -4-

4 - Main Fuse Panel to Battery

  • Removing and installing. Refer to → Electrical Equipment; Rep. Gr.97; Relay Panels, Fuse Panels, E-Boxes; Component Location Overview - Relay Panels, Fuse Panels, E-Boxes.

5 - Cover

  • For the main fuse panel

6 - Positive Terminal Clamp

  • Tightening specification. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Overview - Battery.

Battery Interrupt Igniter, Removing and Installing

  WARNING

Risk of injury due to involuntary deployment.

  • Pay attention to the safety precautions when working with pyrotechnic components. Refer to → Chapter "Safety Precautions when Working with Pyrotechnic Components".
  • Observe the disposal regulations for pyrotechnical components. Refer to → Chapter "Airbag, Belt Tensioner and Battery Cut-Out Units, Storing, Transporting and Disposing (Pyrotechnic Components)".

  Note

  • If the Airbag Indicator Lamp -K75- turns on after a collision, check whether crash data is stored using the Vehicle Diagnostic Tester. If this is the case, check if the malfunction "Resistance too high" for the Battery Interrupt Igniter -N253- is stored in the DTC memory. If this is the case, the Battery Interrupt Igniter -N253- must be replaced.
  • The Battery Interrupt Igniter -N253- interrupts the electrical circuit each time an airbag is deployed. The Battery Interrupt Igniter -N253- must be replaced after a deployment.
  • The Battery Interrupt Igniter -N253- is only available as a replacement part with the main fuse panel on the battery.

Main fuse panel on battery, removing and installing. Refer to → Electrical Equipment; Rep. Gr.97; Relay Panels, Fuse Panels, E-Boxes; Component Location Overview - Relay Panels, Fuse Panels, E-Boxes.

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