Technical Service Bulletin # 910950
Date: 090804
Cell Phone - Echo/Crackling On Bluetooth(R) Connection
91 Echo, crackling noise while on phone via Bluetooth connection
91 09 50
2021276/1
August 4, 2009
Affected Vehicles
Condition
The customer may report that a crackling / cracking noise or echo comes from the speaker while on the phone via Bluetooth connection.
The person on the other side of the line may experience the same condition. The phone conversation may be described like a call under
water.
Technical Background
Wrong coding of telephone transceiver R36 on an e.g. prior replacement may be the root cause.
TIP: Only MOST Telephone transceivers are potentially affected. A4 and A5 have a MOST system when they are equipped with a
navigation system.
Production Solution
Not applicable.
Service
Verify if the coding of the Telephone transceiver R36 (Address word 77) is 10900.
- If this is not the case, change the coding accordingly and verify the phone function with the customer's phone.
- If this is the case, verify if the customers phone is compatible with the vehicle. In addition, try a different compatible phone in the
customer s vehicle and the customer s phone in a newer model year vehicle.
Depending on the findings, the customer may need a compatible phone, a customer-pay MMI software update, or R36 may actually have
to be replaced.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 205
Warranty
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual. Claims are
subject to review or audit by Audi Warranty.
Additional Information
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.
Date: 090804
Cell Phone - Echo/Crackling On Bluetooth(R) Connection
91 Echo, crackling noise while on phone via Bluetooth connection
91 09 50
2021276/1
August 4, 2009
Affected Vehicles
Condition
The customer may report that a crackling / cracking noise or echo comes from the speaker while on the phone via Bluetooth connection.
The person on the other side of the line may experience the same condition. The phone conversation may be described like a call under
water.
Technical Background
Wrong coding of telephone transceiver R36 on an e.g. prior replacement may be the root cause.
TIP: Only MOST Telephone transceivers are potentially affected. A4 and A5 have a MOST system when they are equipped with a
navigation system.
Production Solution
Not applicable.
Service
Verify if the coding of the Telephone transceiver R36 (Address word 77) is 10900.
- If this is not the case, change the coding accordingly and verify the phone function with the customer's phone.
- If this is the case, verify if the customers phone is compatible with the vehicle. In addition, try a different compatible phone in the
customer s vehicle and the customer s phone in a newer model year vehicle.
Depending on the findings, the customer may need a compatible phone, a customer-pay MMI software update, or R36 may actually have
to be replaced.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 205
Warranty
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual. Claims are
subject to review or audit by Audi Warranty.
Additional Information
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.
