Removing and installing battery isolation relay J7: Audi A8 D4

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

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

1. Open the electronics box in the luggage compartment.
2. Remove second battery A1.
3. Unplug connector at battery isolation relay J7(1).
4. Unscrew both positive cables (2) (4 Nm). — 4 Nm (3.0 lb-ft)
5. ⚠ The two positive cables (2) are live!Immediately isolate both cables individually and secure to prevent short circuits! — Unscrew both nuts (arrows) (4 Nm) and remove battery isolation relay J7(1). — 4 Nm (3.0 lb-ft)
6. Installation is performed in reverse sequence.

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