Removing and installing trailer detector control unit J345, estate — VW
Removing and installing trailer detector control unit J345, estate on VW: 10 steps. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform codes AU1, BX5
📋 Procedure
- Switch off ignition and all electrical consumers.
- Remove ignition key, if inserted.
- Remove cover in luggage compartment side trim.
- Remove vehicle tool kit.
- Remove bolts (1).
- Pull mounting for vehicle tool kit in direction of arrow (A).
- Disconnect connectors (2).
- Remove mounting for vehicle tool kit from side panel in direction of arrow (B).
- Press fastener (1) in direction of arrow (A).
- Lift trailer detector control unit J345(2), and remove it in direction of arrow (B).
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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.