Audio System - Low Audio Volume/Popping/Crackling Noise
SI B 65 03 05Sound System, Cruise, Alarms, Monitors
July 2007
Technical Service
This Service Information bulletin supersedes S.I. B65 03 05 dated June 2005.
[NEW] designates changes to this revision
SUBJECT
NEW Low Hands-free Audio Volume and/or Popping/Crackling Noise after TCU Programming
MODEL
E65, E66 (7 Series) from 9/02 to [NEW] 10/03.
SITUATION
The customer may complain that there is a popping/crackling noise and/or low volume coming from the audio sound system after the vehicle software was updated.
This noise can happen with or without telephone usage.
CAUSE
TCU (Telematics Control Unit) DSP setting or hardware failure
PROCEDURE
1. Duplicate customer complaint.
2. [NEW] Check the integrity of the Network Access Device (NAD) following the procedure outlined in SI 65 12 06.
^ If the NAD is faulty, repair the vehicle as outline in SI B65 12 06.
^ If the NAD is NOT faulty, proceed to step 3.
3. Disconnect 54-pin TCU connector and install optical jumper at TCU.
4. If noise is still present, continue normal troubleshooting of the audio sound system.
5. If noise is gone with optical jumper installed, continue with next step.
6. From the label on the TCU, check that the part number of the TCU is one of the following:
^ 84 11 6 934 101
^ 84 11 6 935 268
^ 84 11 6 937 678
7. If one of the above mentioned part numbers is installed in the vehicle, using CD39 or higher, perform the following service function to correct the DSP settings of the TCU. The TCU may become damaged if a different TCU part number is installed.
8. Select "Function Selection".
9. Select "Service Functions/Telecommunication/Correct volume US" then "Test plan".
10. Continue with the DIS test plan "Correct volume US S8400_00006". Please read the important test plan information displayed on the screen before proceeding.
11. On the following screen the question "Has this service function already been carried out for this TCU control module?" Answer "Yes" or "No" and continue.
12. If you answered "No" then answer the question "Did the customer complain about decreased volume of the hands-free system? Answer "Yes" or "No" and continue.
13. If you answered "Yes" then read the displayed instructions on the screen, "The original part number determines whether the installed TCU control module is relevant for this service function. The part number is displayed on the sticker". Because the TCU may have been previously replaced, it's important to read the P/N from the TCU sticker and not from the sticker in the owner's manual.
14. The next screen will ask the question "Is the part number shown on the sticker the same as one of the following?"
^ 84 11 6 934 101
^ 84 11 6 935 268
^ 84 11 6 937 678
15. After you have verified the correct TCU, continue and the following message is displayed "The volume of the hands-free system is now increased. This procedure takes approximately 2 minutes. Please wait".
16. Once the TCU has been updated, the message "The volume has been corrected" appears.
17. End the Service Function and retest the hands-free volume.
18. If noise is still present after the Service Function is performed create a PuMA case and send FASTA data. Replace the TCU.
Note:
It is no longer necessary to send the defective TCU to engineering for analysis.
[NEW] WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Please refer to the latest KSD for all applicable labor operations and allowances.
If the appropriate labor operation is not contained in KSD, then a work time labor operation should be used.
Defect Code 84 31 01 39 00
Disclaimer