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Removing and installing control unit for left gas discharge lamp J343 and/or control unit for right gas discharge lamp J344 (vehicles ▸ 09.00) — VW

Removing and installing control unit for left gas discharge lamp J343 and/or control unit for right gas discharge lamp J344 (vehicles ▸ 09.00) on VW: 11.

Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.

11 steps

🧭 Before you start

Fits: VW Passat B5 (3B)

📋 Procedure

  1. ⚠ Observe procedure and safety notes for gas discharge bulbs — Disconnect battery .
  2. Unclip plastic cover on control unit (arrow) and remove it.
  3. Remove screw on control unit retainer (arrow).
  4. Remove rubber cover over gas discharge lamp.
  5. Release connector on the gas discharge lamp by turning it 90° to left and pull off.
VW? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Pull voltage supply connector off (arrow).
  2. Take off control unit with ancillaries.
  3. When doing this, route the high voltage cable as illustrated.
  4. Check function of headlight after installation.
  5. Carry out basic headlight setting vehicle diagnosis, testing and information systemVAS 5051A in "“guided fault finding”" mode.
  6. Check headlight settings and adjust if necessary 36.

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

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Workshop data on this page last updated 20 Sep 2026.