Removing and installing onboard supply control unit — VW
Removing and installing onboard supply control unit on VW: 15 steps, 1 torque figure. What to remove, what to tighten and to how many Nm, what to check.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code BL1
Don't miss
- For reasons of space, the fuse holder has to be removed from the relay carrier but can remain connected.
- The following illustration shows the installed onboard supply control unit on the rear of the relay carrier.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 1.5 Nm (1.1 lb-ft) | Tighten securing bolts (2) |
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
- First of all, carry out the work involved in "“renewing onboard supply control unit”".
- Switch off ignition and all electrical consumers, and remove ignition key.
- Remove trim in footwell General body repairs, interior68Storage compartments/covers; Overview of fitting locations - storage compartments/covers. [Note: For reasons of space, the fuse holder has to be removed from the relay carrier but can remain connected.]
- Remove fuse holder from relay carrier . [Note: The following illustration shows the installed onboard supply control unit on the rear of the relay carrier.]
- Pull the two clips (1) of the primary locking system downwards in (direction of arrow), and pull the two connectors (A) and (B) off onboard supply control unit J519(2).
- Press the two locking buttons (3), and pull onboard supply control unit J519(2) out of holder, starting at bottom.
- First insert onboard supply control unit J519(2) into top mountings (1) on holder, and then push unit into catches at bottom (3) until it engages audibly.
- Connect vehicle diagnostic testerElectrical system, General information97Vehicle diagnosis, testing and information systems; Connecting vehicle diagnostic tester.
- Renewing onboard supply control unit J519
- Connect vehicle diagnostic testerElectrical system, General information97Vehicle diagnosis, testing and information systems; Connecting vehicle diagnostic tester.
- Coding onboard supply control unit J519.
- Connect vehicle diagnostic testerElectrical system, General information97Vehicle diagnosis, testing and information systems; Connecting vehicle diagnostic tester.
- Adapt onboard supply control unit J519 using .
- Connect vehicle diagnostic testerElectrical system, General information97Vehicle diagnosis, testing and information systems; Connecting vehicle diagnostic tester.
- Final control diagnosis of onboard supply control unit J519.
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
- Dismantling and assembling clutch "B" – VW Phaeton
- Removing and installing knee airbag bracket (Golf 2009 ►) RHD models · 3 torque figures
- Removing and installing oil filter bracket – VW · 3 torque figures
- Topping up oil in Haldex coupling · 2 torque figures
- Removing and installing fuel tank (Tiguan) – VW 1.4 · 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.