Electronic Parking Brake - Warning Lamp ON
46 EPB light on46 08 09
2016072/3
November 4, 2008. Supersedes Technical Service Bulletin Group 46 number 07-03 dated October 9, 2007 for reasons listed below.
Vehicle Information
Condition
The Electronic Parking Brake (EPB) warning may turn on unnecessarily.
This software update does not affect the operational functionality of the system.
Technical Background
On Audi A8 vehicles, the warning lamp for the electronic parking brake (EPB) may light up due to a memory overflow on the EPB control unit.
Production Solution
Updated EPB software implemented in the production of new vehicles.
Service
Customers do not need to be directly informed of the repair. Please ensure that all affected vehicles are checked and repaired during a service visit. You should also pass on this information to your used car sales department so that the vehicles within the affected range can be checked and repaired before sale.
Electronic Parking Brake Control Module Software must be updated to 220 (or higher)
1. Ensure that the battery has a minimum no-load charge of 12.5 V.
NOTE:
Failure to maintain voltage during update process can lead to Control Module failure.
Minimize any voltage draw:
- Turn off the radio and other accessories.
- Apply emergency brake to turn off running lights (if applicable).
- Make sure that no electromagnetic sources (mobile phone or cordless DECT telephone) are operated in or near the vehicle while the individual control module is being updated.
2. Connect VAS 5051B or VAS 5052 to your workshop network.
- If using VAS 5052, insert the update CD, TRW No. YWB 4002A in the CD drive of the tester.
- If using VAS 5051B, insert the update CD, TRW No. YWB 4002B in the CD drive of the tester.
3. Select Applications >> Start application from CD ROM >> Next.
Tip:
If you press the red button (<), this will cancel the complete program. It is not possible to go one step back to the previous window. Press the green Next button (>) to advance to the next step in the program.
4. Pull the control switch for the parking brake. The EPB warning lamps in the switch and in the instrument cluster will light up.
5. Press the "Next" button (>).
6. Switch off the ignition.
7. Press the "Next" button (>).
8. Take out the ignition key.
9. Press the "Next" button (>).
10. Open the fuse box cover at the driver's side of the dash panel.
11. Press the "Next" button (>).
12. Pull out the bridge connector.
13. Press the "Next" button (>).
14. Connect red connector of adapter cable TRW No. YWB 4001 to connector at side of dash panel.
15. Press the "Next" button (>).
16. Connect yellow connector of adapter cable TRW No. YWB 4001 to diagnostic socket of vehicle.
17. Press the "Next" button (>).
18. Connect black connector of adapter cable TRW No. YWB 4001 to diagnostic connector of original cable from tester.
19. Press the "Next" button (>).
20. If there is no battery voltage at the diagnostic connector, check all connections. Press the "Next" button (>).
21. Wait until the warning lamp in EPB switch goes out. You may have to wait for up to 3 minutes.
22. Press the "Next" button (>).
23. Insert the key into the ignition and switch on the ignition. The program will continue automatically.
24. If VAS 5051B or VAS 5052 is not able to establish communication with any of the onboard control units, check all connections. Press the "Next" button (>).
25. If the existing software in the EPB control unit is OK, you will see the screen in Figure 7. Press the "Next" button (>).
26. If the screen in Figure 8 is displayed, the EPB control unit has registered one or more faults. Press the "Next" button (>).
27. Repair the faults as described in the Workshop Manual, and then perform the software update again.
NOTE:
Do not replace the EPB control unit if the fault 16347 Control unit defective is stored in the memory of the EPB control unit. This fault will be rectified by the software update.
28. Switch off the ignition. The program will continue automatically.
29. If the tester is not able to set up a connection with the EPB control unit within one minute, remove the fuses for the EPB control unit (on right side of luggage compartment). Press the "Next" button (>).
30. Insert the fuses again. Press the "Next" button (>).
31. Switch on the ignition. The program will continue automatically.
32. Switch off the ignition. The program will continue automatically.
33. Take out the ignition key.
34. Press the "Next" button (>).
35. Insert the key into the ignition again and switch on the ignition. The program will continue automatically.
When the tester has successfully established a connection with the EPB control unit, it will perform the first part of the software update ('Bootloader').
36. Switch off the ignition. The program will continue automatically.
37. Switch on the ignition. The program will continue automatically.
When the tester again sets up the connection with the EPB control unit, it will perform the second part of the software update ('Application').
38. Switch off the ignition. The program will continue automatically.
39. Switch on the ignition. The program will continue automatically.
40. Switch off the ignition. The program will continue automatically.
41. If you see the screen in Figure 11, the software update was successful. Press the "Next" button (>).
Figure 12:
42. If you see the screen in Figure 12, the software update was not successful. Press the "Next" button (>).
43. Press the "Next" button (>).
44. Install a new EPB control unit according to the instructions in the Workshop Manual.
Submitting a report to the Software Versions Management (SVM)
1. Select Guided Fault Finding.
2. Identify the vehicle.
3. The Vehicle System Test will be carried out, during which all fault memories will be read. If necessary, follow the further instructions on the screen and manually select any control units that have not been detected.
4. Press the "Next" button (>) when all control units have been interrogated.
5. Select Go to >> Function / Component Selection >> Software Versions Management (SVM) >> Problem-related hardware and software update >> Direct input: SVM code for problem-related update.
6. Press the "Next" button (>) to transfer the selected option into the test plan.
7. Select Direct input: SVM code for problem-related update.
8. Start the program by pressing the "Next" button (>).
9. Activate the virtual screen keypad.
10. Enter the code NA4E45CCIL and confirm with the "Next" button (>).
All the control units in the vehicle will now be interrogated and the data will be read by the tester.
11. Confirm the message to the effect that you require a network connection with Done.
12. Enter your 'GeKo' user-ID and confirm with OK.
The data read out from the vehicle and the SVM code will now be transmitted.
Then, the reply from the Software Version Management will be received and evaluated.
The display will show the result of a Specified/actual comparison that is performed automatically by the system. Should you receive an implausible reply from the SVM, please refer to the TSB 2011732, Software Version Management (SVM) Operating Manual, and follow the troubleshooting procedures as listed in the Additional Information section.
13. Press Done.
14. Quit Guided Fault Finding by selecting Go to >> Exit.
15. Press the 'Exit' button to confirm that you want to end the program.
The system will erase all fault memories and then interrogate them again. If the Readiness code was deleted, please answer No to the question regarding the creation of the Readiness code.
16. Follow the further directions given in the display.
17. In order to document and bill your work, the diagnosis log has to be transmitted. Select Yes.
18. Please answer all questions regarding workshop job number, chassis number, result of repair, and reference to ELSA (if applicable).
The VAS 5051 / VAS 5052 unit will now transmit the diagnosis log via the workshop network.
19. Print out the diagnosis log for your records.
20. Switch off the ignition.
Warranty
When procedure applies to vehicles under warranty, use the following:
WIN
SAGA
Required Parts and Tools
Additional Information
The following Technical Service Bulletin will be necessary to complete this procedure:
- 2011732; Software Version Management (SVM) Operating Manual
All part and service references provided in this TSB are subject to change and/or removal. Always check your Parts Dept. and service manuals for the latest information.