Removing and installing battery isolation igniter N253 (equipment version) — AUDI

🧭 Before you start

Fits: Audi A4 B6/B7 (8E)

• Also covered elsewhere: Electrical system27

Don't miss

• Observe the notes on the disposal of pyrotechnic airbag units .
• Observe safety regulations for pyrotechnic components . — When plugging in connector make sure it is properly engaged and locked in place.
• Make sure nobody is in the vehicle when the battery is being connected. — Connect battery. For measures required refer to Electrical system27.

📋 Procedure

1. ⚠ Observe safety regulations for pyrotechnic components . — With ignition switched off, disconnect earth wire at battery Electrical system27.
2. Remove luggage compartment side trim (left-side) General body repairs, interior70.
3. Unfasten quick-release fasteners (1) and (3) and open lid (2) of main fuse box in luggage compartment (arrow).
4. Unscrew nuts (1) and (3) at positive wires.
5. Take battery isolation igniter N253(item 2) out of its retainer.

6. ⚠ Before unplugging the connector, discharge static by, for example, briefly touching the door striker plate. — Unplug electrical connector (4).
7. To do so, release connector locking element (2) as far as stop using a screwdriver (arrow). This will release electrical connector (1) which can then be unplugged. [Note: Observe the notes on the disposal of pyrotechnic airbag units .]
8. ⚠ Observe safety regulations for pyrotechnic components . — When plugging in connector make sure it is properly engaged and locked in place.
9. Observe the specified tightening torques .
10. Switch on ignition.
11. ⚠ Make sure nobody is in the vehicle when the battery is being connected. — Connect battery. For measures required refer to Electrical system27.
12. Observe measures to be taken after connecting the battery Electrical system27.
13. Finally read out fault memory for airbag control unit using and rectify faults as necessary.

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Removing and installing infotainment system display - NAR vehicles
• Removing and installing knock sensor – Audi A8 D4
• Renewing brake caliper (1LJ, 1ZD) – Audi Q3
• Removing and installing outer belt guide (rear) - Saloon
• Checking suction-jet pump – Audi A6 C5