Removing and installing second battery A1 - vehicles with high-voltage system — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

Don't miss

• Check that battery is firmly secured after installing.
• If the battery is renewed, the new battery must be adapted .
• After reconnecting the voltage supply, it is possible that the ESP warning lamp will not go out until the vehicle has been driven several metres.

📋 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. — Remove rear exhaust air duct for drive battery Heating, air conditioning87Air duct.
2. Remove nuts (2, 4) and bolts (1, 6).
3. Move wiring harness (5) clear and remove battery bracket (3).
4. Release and detach cover (10) for negative terminal.
5. Slacken off nut (7) several turns and disconnect battery clamp (8) of earth cable from battery terminal.

6. Open cover (2) over positive battery terminal.
7. Slacken off nut (3) several turns and disconnect battery clamp (4) of positive cable from battery terminal.
8. Pull off hoses (1, 9) for central gas venting system.
9. Remove bolts (arrows) on battery retainer plate (5).
10. Lift battery (6) out of luggage compartment. [Note: Only install maintenance-free batteries with the specifications "“TL82506”" (from December 1997 onwards) and "“VW75073”" (from August 2001 onwards).Batteries from the Audi parts range feature a base strip adapter for matching to different retainer flanges. The battery operating instructions give details of when and how to use the base strip adapter.]
11. ⚠ Observe environmental requirements.When disposing of used batteries, always observe the required disposal procedures for batteries and sulphuric acid Electrical system; General information27Battery. — Insert battery in battery tray so that battery base strip engages in retainer flange (2) of battery tray and makes contact at stop (1).
12. Fit battery retainer plate (6).
13. Tighten bolts (5, 7) for battery retainer plate.
14. Connect hoses (1, 8) for central gas venting system.
15. Connect up battery in the following sequence with ignition and electrical equipment switched off:
16. First connect battery clamp (4) of positive cable by hand to positive battery terminal "“+”" and tighten nut (3).
17. Close cover (2) over positive battery terminal.
18. Unplug electrical connector (2) at battery monitor control unit J367(item 3).
19. Attach battery clamp of earth cable to negative battery terminal "“–”" by hand and tighten nut (1).
20. Reconnect connector at battery monitor control unit J367.
21. Check that battery is firmly secured after installing.
22. Install rear exhaust air duct for drive battery Heating, air conditioning87Air duct.
23. If the battery is renewed, the new battery must be adapted .
24. Select Diagnosis mode and start diagnosis.
25. Select Test plan tab.
26. Select Own test then the following options one after the other: [Note: After reconnecting the voltage supply, it is possible that the ESP warning lamp will not go out until the vehicle has been driven several metres.]

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