Removing and installing retaining frame for control units - vehicles up to model year 2013 and all vehicles with high-voltage system — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

Don't miss

• Disregard (item 4) and (arrows).

📋 Procedure

1. ⚠ Risk of fatal injury if high-voltage components are damaged.Observe the following when working in the vicinity of high-voltage components or wiring:It is not permitted to use cutting or forming tools, other sharp-edged tools or heat sources such as welding, brazing, soldering, hot air or thermal bonding equipment.Before starting work, visually inspect the high-voltage components in the areas involved.Before working in engine compartment, visually inspect power and control electronics for electric driveJX1, electric drive motor V141, air conditioner compressor V470 and high-voltage wiring. Before working on the vehicle underbody, visually inspect the high-voltage wiring and covers. Before working on the rear section of the vehicle, visually inspect the high-voltage wiring and the electro-box with the maintenance connector for high-voltage system TW . Visually inspect all potential equalisation lines.Check the following when making the visual inspection:There must be no external damage on any component. The insulation of the high-voltage wiring and potential equalisation lines must not be damaged. There must be no unusual deformation of the high-voltage wiring. All high-voltage components must be identified by a red warning sticker. — De-energise high-voltage system Electrical system, hybrid93De-energising high-voltage system.
2. Remove luggage compartment back panel trim General body repairs, interior70Luggage compartment trim panels; Overview of fitting locations - luggage compartment trim panels.
3. Unplug electrical connectors (1) and (3).
4. Carefully disconnect fuse (8) and unplug aerial connector (7).
5. Unplug electrical connectors (2, 5, 6). [Note: Disregard (item 4) and (arrows).]

6. Unplug electrical connector by releasing catch (1) and moving retaining clip in direction of (arrow).
7. If fitted, remove nut (4) and bolts (1) and (2).
8. Detach bracket (3) for refrigerator box.
9. If fitted, release retaining spring (arrow) and pull control unit (1) out of retaining frame and place to one side with wiring (2, 3, 4) still connected.
10. Release retaining spring (arrow) and pull control unit for headlight range control J431(item 1) out of retaining frame and place to one side with wiring (2) still connected.
11. Move clear electrical wiring harness (2) at retaining frame.
12. Remove nuts (1).
13. Release retaining tabs (4) and remove retaining frame (3) from fuse holder F to rear in direction of travel.
14. Install control unit for headlight range control J431.
15. Install convenience system central control unit 2J773.
16. Install bracket for refrigerator box General body repairs, interior76Refrigerator box; Removing and installing attachments.
17. Re-install the remaining components that were previously removed.
18. Re-energise power supply of high voltage system Electrical system, hybrid93De-energising high-voltage system. [Note: Re-energising high-voltage system:Connect vehicle diagnostic testerSelect Guided Fault Finding modeUsing the Go to button, select the following menu options in succession:Function/component selectionBodyElectrical systemSelf-diagnosis-compatible systems8C - Hybrid battery management -J8408C - Hybrid battery management, functions51 - Re-energise high-voltage system (Rep. gr. 93)]

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 vacuum pump (4.2 ltr. TDI) – Audi · 1 torque figures
• Checking delivery pressure of power steering pump (vehicles with 6-cylinder FSI petrol engine) · 1 torque figures
• Removing and installing power steering pump (vehicles with 6-cylinder FSI petrol engine)
• Removing and installing turbocharger - vehicles with engine code letters AVF, AWX
• Removing and installing glove box trim – Audi TT Mk1 · 3 torque figures