TCU I-bus fault profiles for audio output and voice quality

The following table lists the fault profiles covered in this test module.

The last three columns contain the information on which telephone systems each fault profile applies to:

A: telephone systems with cordless handset (e.g. optional extra 638 before 03/2005)
B: telephone systems with hard-wired mobile phone (e.g. optional extra 639 before 03/2005 and retrofit)
C: telephone systems with mobile phone connected via Bluetooth (e.g. optional extra 639 between 09/2004 and 03/2005 - Business or Professional, optional extra 639 as of 03/2005, optional extra 633)

Voice quality / audio output

1	The caller hears no voice signal (call via hands-free speaking system).			C
2	The driver cannot hear the caller.	A		C
3	Poor voice quality during call via hands-free speaking system: whistling	A	B	C
4	Poor voice quality during call via hands-free speaking system: echo	A	B	C
5	Poor voice quality (call via hands-free speaking system)	A	B	C