Removing and installing control unit for head-up display — AUDI
Removing and installing control unit for head-up display on Audi: 12 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 A4 B9 (8W, 2015–)
Don't miss
- Locate windscreen in position and secure temporarily, but do not bond in glass.
📋 Procedure
- ⚠ Risk of damage to control unit for head-up display J898.When removing the control unit J898 do not unscrew any bolts other than those specified.If the bolts for the upper section of the housing are removed, the control unit J898 must be renewed.If the control unit for head-up display J898 is dropped, it must be renewed (internal components may be irreparably damaged even if no external damage is visible).When fitting the control unit J898, do not exert any pressure on the upper section of the housing, otherwise the control unit may have to be renewed. — Pry cover (top) (2) off dash panel (1) using wedge T10383(arrow).
- Remove bolts (arrows).
- Detach retaining frame (1).
- Cover control unit (3) with a soft cloth.
- Remove windscreen General body repairs, exterior64Windscreen; Removing and installing windscreen.
- Remove bolts (1, 2, 4).
- Lift out control unit slightly and unplug electrical connector.
- Detach control unit.
- Fit control unit and tighten bolts.
- Locate windscreen in position and secure temporarily, but do not bond in glass.
- Switch on ignition and check function of control unit.
- Calibrate control unit for head-up display .
Other AUDI procedures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
- Removing and installing drive plate – Audi A4 B5 · 17 torque figures
- Dismantling and assembling planetary gearbox · 12 torque figures
- Installing front roof reinforcement · 12 torque figures
- Removing and installing timing chain covers – Audi A8 D3 · 11 torque figures
- Removing and installing steering column – Audi Q7 · 11 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.