Removing and installing battery isolator — VW
Removing and installing battery isolator on VW: 11 steps, 2 torque figures. What to remove, what to tighten and to how many Nm, what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Passat B7 saloon (362, 2010–2014), VW Passat B7 Variant (365, 2010–2014)
Don't miss
- When attaching connector to pyrotechnical battery isolator, make sure that the connector engages audibly and that the primary locking mechanism is pressed in again.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 15 Nm (11 lb-ft) | Tighten nut of B+ wire at main fuse box (1) |
| 15 Nm (11 lb-ft) | Tighten securing nut (self-locking) (4) of pyrotechnical battery isolator at main fuse box |
ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.
📋 Procedure
- ⚠ Observe safety precautions when your are working on battery isolator .Comply with the instructions regarding the disposal of battery isolating units . — Switch off ignition and all electrical consumers.
- Disengage ignition key out in position 0 (forward notch).
- Disconnect battery in luggage compartment .
- Open fasteners of main fuse box (1) by turning them 90° to left and open cover downwards.
- Unbolt flanged nut (1) and detach battery positive cable (2) from connection thread.
- Unscrew self-locking nut (4) and remove pyrotechnical battery isolator (3) from connection threads. Take cable length into consideration while removing battery isolator.
- Release connector (1) by pulling primary locking mechanism (3) in direction of arrow.
- Pull connector (1) off in direction of arrow and remove pyrotechnical battery isolator (2) from vehicle. [Note: When attaching connector to pyrotechnical battery isolator, make sure that the connector engages audibly and that the primary locking mechanism is pressed in again.]
- Tighten nut of B+ wire at main fuse box (1) to 15 Nm. — 15 Nm (11 lb-ft)
- Tighten securing nut (self-locking) (4) of pyrotechnical battery isolator at main fuse box to 15 Nm. — 15 Nm (11 lb-ft)
- Connect battery in luggage compartment .
Other VW procedures
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
- Rear wheel outer bearing - regulate · 1 torque figures
- Primary shaft - replace front bearing · 1 torque figures
- Lower fastening point of rear seat belt - remove and install · 1 torque figures
- Water pump toothed belt - remove and install
- Gearbox oil - check and refill · 1 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.