Infotainment - Lost Sound From iPod(R) iOS 5 And Newer
Technical JournalTITLE:
Sensus, lost sound from iPod function, iOS 5 and newer
CAR MARKET:
United States and Canada
ISSUING DEPARTMENT:
Technical Service
REF NO:
TJ 25478
ISSUE DATE:
YEAR
2013
MONTH
01
DAY
09
PARTNER:
3 US 7510 Volvo Cars North America
FUNC DESC:
Equipment for entertainment
(radio/TV/VC)
FUNC GROUP:
3930
"Fixed Right - First Time"
Attachment
Vehicle Type
CSC Customer Symptom Codes
DTC Diagnostic Trouble Codes
Text
CSC = Customer Symptom Code
iOS = Apples operating system
IAM = Integrated Audio Module
ICM = Infotainment Control Module
This document supersedes the previous one dated 2012-02-10. Changes to this document are:
- Behavior for Apple iOS 6 added.
- Model year range expanded
If using a printed copy of this document, always check for the latest online version.
DESCRIPTION:
It has come to our attention that the audio suddenly disappears when using the iPod function in Sensus vehicles. The information regarding artist, album and song title can still be seen in the ICM display.
After the release of iOS 5 from Apple, the compatible iOS 5 devices have changed the connection strategy when it comes to bluetooth streaming.
The issue happens when an iPhone is connected to the Sensus iPod and bluetooth hands free functions. When the iPhone tries to force the vehicle (IAM2.1) to use the USB connection (dock connection), the audio is transferred to bluetooth after 30-60 seconds. The iPhone enters so called bluetooth "sniff" mode after 30-60 seconds and this triggers the IAM2.1 to send a bluetooth "unsniff" request to the iPhone. From our latest analysis, the behavior is, from this point, different when it comes to using iOS 3/4 and iOS 5+. When using iOS 5 and newer, the IAM2.1 sends a "play" command and not a bluetooth "unsniff" request to the iPhone. This will make the iPhone switch from dock connector to bluetooth streaming which results in the audio in Sensus iPod mode going silent.
Certain AVRCP (Audio/Video Remote Control Profile) versions have different behaviors on IAM2.1.
For Apple iPhone:
iOS 3/4: AVRCP version 1.0, works OK, but does not transfer artist, album and song title IAM 2.1.
iOS 5: AVRCP version 1.4, works OK, and transfers artist, album and song title to the IAM2.1
iOS 6: AVRCP version 1.4, works OK, and transfers artist, album and song title to the IAM2.1
However, AVRCP version 1.3 and newer will result in the IAM2.1 sending "play" for bluetooth devices. The reason for this IAM2.1 behavior was to support phones from Sony Ericsson. These phones did not start to play at bluetooth connection and the command was added to ensure play. So, our supplier created this issue inadvertantly in an attempt to support Sony Ericsson phones but the problem was not discovered until Apple released iOS 5 with support for AVRCP version 1.4.
PRODUCT MODIFICATION:
A new service software has been developed, released and entered production as of structure week 201209.
SERVICE:
Do not exchange any units as this is a software malfunction.
Perform an IAM upgrade to correct this fault.
If the customer still complains of lost sound after the upgrade please refer to TJ 25640.
VOLVO STANDARD TIME GUIDE OPERATION NUMBER:
36004 Software Control unit downloading See VSTG