Cellular Phone - Bluetooth(R) Call Volume Is Too Low
91 Bluetooth call volume too low
91 10 05
2018475/3
February 16, 2010.
Supersedes Technical Service Bulletin Group 91 number 08-70 dated November 7, 2008 for reasons listed below.
152
Affected Vehicles
Condition
Telephone call volume level becomes too quiet after a while and the volume cannot be increased sufficiently using the radio, steering wheel controls
or volume controls on the phone itself.
Technical Background
This can only occur with Concert II+ or Symphony II+ radios. When the volume level is being adjusted down on the radio or multi-function steering
wheel at the same time as an active phone call is ended, it is possible that the phone output level is permanently reduced in the radio.
Production Solution
A3: New software from MY2010.
TT: In preparation.
A4 / A4 Cabriolet: Not applicable (radio no longer in production).
Service
For A3, A4, A4 Cabriolet and TT vehicles:
When the condition occurs, it is possible to reset the phone output level by returning the radio to a default configuration. Only adaptation channel 51
must be changed.
1. Record all station presets. This procedure will cause all radio settings and memory to be lost because the radio will be returned to a factory default
configuration.
2. Select Vehicle Self Diagnosis >> 56 - Radio >> 012 - Adaptation >> Channel 51.
3. Change the value to a 1 and save.
It is not necessary to reset the adaptation channel to its original value. The radio settings are reset.
4. Restore station presets prior to returning vehicle to the customer.
5. Explain the technical background to the customer so as to avoid recurrence of the condition.
For A3 vehicles with a recurring customer complaint only:
Replace the radio using the applicable new part number listed in the parts table below and the appropriate GFF function test.
153
Warranty
Required Parts and Tools
Additional Information
More information on this system can be found in the following resources:
^ TSB 2019821 91 Bluetooth phone preparation: Bonding tone volume level
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
