Removing and installing heated windscreen control unit J505 — AUDI
Removing and installing heated windscreen control unit J505 on Audi: 10 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi Q7 (4M, 2015–)
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- Mark electrical wiring (F) and (H) for re-installation.
- Insulate positive wire (H) to eliminate risk of short-circuit.
📋 Procedure
- Switch off ignition.
- Remove glove box General body repairs, interior68Shelves / trim panels; Removing and installing glove box.
- Disconnect earth cable from battery with ignition switched off Electrical system27Battery; Disconnecting and connecting battery.
- ⚠ Risk of short circuit when disconnecting the power supply to the heated windscreen control unit J505Disconnect earth cable from battery with ignition switched off.Remove the fuse in the power supply to the heated windscreen control unit J505.Before unscrewing the hexagon nuts, use a voltage detector to check that they are not connected to a live voltage. — Release and open terminal protector (D).
- Mark electrical wiring (F) and (H) for re-installation.
- Unscrew nuts (E, G) and move wiring clear.
- Insulate positive wire (H) to eliminate risk of short-circuit.
- Release catch and remove control unit J505(A) downwards from bracket (C).
- Release und unplug connector (B).
- Attach electrical wiring (F) and (H) according to the applied markings.
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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.