Removing and installing battery isolator igniter: VW Passat B8

🧭 Before you start

Fits: VW Passat B8 (3G, 2014–)

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• Ensure electrical connector is pushed fully onto stop and engages audibly.

📋 Procedure

1. ⚠ Observe safety instructions for pyrotechnic components .Observe disposal regulations for pyrotechnic components . — On "“Passat GTE vehicles”", disconnect maintenance connector for high-voltage systemTW.
2. With ignition switched on, disconnect battery earth cable 27Battery; Disconnecting and connecting battery.
3. Loosen nut (1) several turns, and pull battery terminal clamp of positive cable, together with fuse holder ASA, off battery terminal.
4. Pull out fuse holder ASA upwards.
5. Release retaining spring (3), and swing cover (2) above fuse holder ASA upwards to open it (arrow).

6. ⚠ Before handling pyrotechnical components (e.g. separating the electrical connector), the person handling them must "“electrically discharge”" himself. To do this e.g. briefly touch the door striker plate. — Unscrew nuts (2 and 3).
7. Remove battery isolation igniter (4).
8. To do this, release connector lock (5) using a small screwdriver, and pull off connector (1). [Note: Ensure electrical connector is pushed fully onto stop and engages audibly.]
9. ⚠ Battery must be connected with ignition switched on. If pyrotechnic components (e.g. airbag, seat belt tensioners) are repaired incorrectly, undesired triggering may occur after the battery is connected. Ensure that nobody is in vehicle when connecting battery. — On "“Passat GTE vehicles”", connect maintenance connector for high-voltage systemTW.
10. With ignition switched on, connect battery earth cable 27Battery; Disconnecting and connecting battery.
11. ⚠ If the ignition has not yet been switched on after the battery has been reconnected "“warning lamps in dash panel insert are off”", the ignition (key or button) must only be switched on while sitting on the driver seat and with the seat set to rearmost position. — Finally, read and clear event memory of airbag control unit since faults may be stored as a result of disconnecting electrical connectors .

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