Removing and installing anti-theft engine control unit, with locking plate — VW

🧭 Before you start

Fits: VW Passat B6 (3C, 2005–2010)

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• The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.

🔧 Engine codes this applies to

📐 43 workshop diagrams for BLR

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Switch off ignition.
2. Remove wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
3. Remove plenum chamber cover General body repairs, exterior64Flush-bonded windows; Assembly overview - plenum chamber cover. [Note: The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.]
4. ⚠ Cover lines, connections and control units in the vicinity of the engine control unit to prevent damage through heat (scorching/melting of plastics etc.). — Turn temperature setting potentiometer (2) to maximum heat output (600°C).
5. Set two-stage switch for volume of air (3) to position 3.

6. ⚠ When shear-head bolts are heated up, parts of the protective housing will be subjected to a large amount of heat. Wear protective gloves to avoid possible injury. — Pull connector (1) off heated windscreen control unit J505.
7. Move nozzle of hot air blower to one of the two shear-head bolts (2).
8. Switch on hot air blower and heat shear-head bolt (2).
9. Unscrew shear-head bolt (2) using pliers on bolt head.
10. Raise cover (1) and remove towards the front.
11. Remove retainer frame with engine control unit from plenum chamber.
12. Press locking device (1) outwards and slide engine control unit (2) out in (direction of arrow).

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