PI0688E

File in Section:
Bulletin No.:
Service Bulletin
Date:
PI0688E
July, 2013
PRELIMINARY INFORMATION
Subject:
Poor Voice Quality During Bluetooth Call or OnStar® Personal Call
Models:
2012-2013 Cadillac Escalade Models
2012-2013 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2012-2013 GMC Sierra, Sierra Denali, Yukon Models
This PI has been revised to update the Parts and Warranty Information. Please discard
PI0688D.
Condition/Concern
Some customers may comment on poor voice quality heard by the person they are talking to when using hands-free
calling (HFC). The voice of the person in the vehicle may sound "tinny", "distorted", or "computerized/digitized.”
Received audio heard in the vehicle is not affected.
This condition is the result of low vehicle voice input (quiet talkers) and high ambient noise (road, wind, engine, etc.).
Recommendation/Instructions
Replace the mobile telephone microphone. Refer to SI for replacement procedures.
DO NOT REPLACE the vehicle communication interface module (VCIM) and do not update the software calibration.
This microphone change will improve voice quality as heard by the receiver.
Note: Advise the customer to turn “Echo Control” OFF on personal cell phones that are paired to the vehicle. Doing
this improves the quality of communications.
This option is not available on all personal cell phones; however, it is a choice on Blackberry mobile phones.
Example: On the Blackberry Bold 9650, the user would follow these steps to adjust the setting - Choose the wrench
icon (“Options”), Networks & Connections, Bluetooth Connections, Select a paired device (e.g. ‘Your vehicle’),
Choose ‘Device Properties’, Scroll down to "Echo Control" & Change it to “OFF” via the dropdown menu.
Parts Information
Part Number
Description
Qty
15241529
MICROPHONE, MOBILE TEL
1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
3422440
Mobile Telephone Microphone Replacement
Use Published
Labor
Operation Time