Safety Circuit Breaker: Service and Repair

Battery Interrupt Igniter

Special tools, testers and auxiliary items required

• Torque Wrench (V.A.G 1331)

CAUTION!
• Observe safety precautions when working on battery isolation system. Refer to => [ Battery Interrupt Igniter, Safety Precautions ] Service Precautions.

• Observe notes for disposal of battery isolator units. Refer to => [ Battery Interrupt Igniter Disposal ] Battery Interrupt Igniter Disposal.

Removing

- Turn off the ignition and all electrical consumers.

- Disconnect battery. Refer to => [ Battery, Disconnecting and Connecting ] Battery, Disconnecting and Connecting.

- Loosen tensioning strap - 1 - on tool kit and vehicle jack formed insert - 2 - and remove formed insert - 2 -.





- Open main fuse box catches - arrows - by turning 90° left and fold cover up.





- Remove collar nut - 2 - and remove line - 1 - from connector threads.





- Remove self-locking nut - 3 - and remove Battery Interrupt Igniter (N253) - 4 - from connector threads while being careful of connected lines.

- Disengage harness connector - 1 - by pulling locking button - 2 - in direction of arrow.





- Remove connector - 1 - and remove Battery Interrupt Igniter (N253) - 3 - from vehicle.

CAUTION!
While doing this, observe safety precautions when working on pyrotechnic battery isolation system. Refer to => [ Battery Interrupt Igniter, Safety Precautions ] Service Precautions.

Installing

Install in reverse order of removal, noting the following:

• When installing connector to Battery Interrupt Igniter (N253), ensure connector engages audibly.

- Tighten all threaded connections to specified torque. Refer to => [ Specifications ] Specifications.

- Connect battery venting hose.

- Reconnect battery. Refer to => [ Battery, Disconnecting and Connecting ] Battery, Disconnecting and Connecting.

CAUTION!
Central battery venting hose must not be kinked, closed and/or damaged. Battery acids pose health risks and are explosive. Carefully route the hose and ensure the battery can vent freely and not into inside of vehicle.