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.

    READ NEXT:

     Driver Side Airbag

    Overview - Driver Side Airbag 1 - Wiring Harness For Driver Airbag Igniter -N95- and Driver Airbag Release Valve Igniter -N490- Replacing. Refer to → Chapter "Airbag Connector,

     Front Passenger Airbag

    Overview - Front Passenger Airbag 1 - Connector For Front Passenger Airbag Igniter 2 -N132- 2 - Connector For Front Passenger Airbag Release Valve Igniter -N491- 3 -&nb

     Thorax Airbags

    Overview - Front Thorax Airbag 1 - Front Thorax Airbag With Driver Thorax Airbag Igniter -N199- Front Passenger Thorax Airbag Igniter -N200-   WARNING Risk of injury due to in

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     Leak Detection on Refrigerant Circuit Using Leak Detection Kit -VAS6201A-

    Vehicles with a High Voltage System (Hybrid Vehicles) Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to → Chapter "Warnings when Working on Vehicles with High Voltage System" and → Electrical Equipment; 

     Hydraulic Pressure Sensor 1 -G545- and Hydraulic Pressure Sensor 2 -G546-, Removing and Installing

      Note The Mechatronic remains installed.   WARNING The system is under pressure. The electronic ATF pump must be deactivated every time before opening the transmission, and the hydraulic pressure reservoir is drained. Refer to → Chapter "ATF Pump, Deactivating and Draining

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