Sierra 1500 4WD V8-6.0L (2007)
Navigation System: All Technical Service Bulletins
Navigation Radio - Various Noises Explained
INFORMATION
Bulletin No.: 06-08-44-034E
Date: February 11, 2011
Subject: Information on Noise Sources from Navigation Radio - CD/DVD Disc Accessing Noise from Radio Fan, for Cooling, Disc Accessing Noise for
Navigation Operation or NAV Traffic Information
Models:
2008-2011 Buick Enclave
2007-2009 Cadillac SRX
2007-2011 Cadillac DTS, Escalade, Escalade ESV, Escalade EXT
2007-2011 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2009-2011 Chevrolet Traverse
2007-2011 GMC Acadia, Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL
2007-2009 HUMMER H2
2007-2010 Saturn OUTLOOK
Supercede:
This bulletin is being revised to add the 2011 model year. Please discard Corporate Bulletin Number 06-08-44-034D (Section 08 - Body and
Accessories).
Some customers may comment that there are unusual fan type noises coming from the navigation radio. Additionally, the customer may comment on
radio noise coming from the CD/DVD or MAP disc mechanisms when CDs/DVDs or MAP discs are present in the CD mechanisms. Some customers
have mentioned that radio noise is present when the customer enters the vehicle or that the noise continues after they shut the vehicle off and open the
door to leave the vehicle. This noise has been described as a fan sound or hearing a disc spinning.
Source of fan sound - It is normal for the radio fan to run when the vehicle is turned on and for up to three minutes after the vehicle has been turned off
and the driver's door has been opened or closed.
Disc spinning sound - This is a normal operational sound. This is caused by the map disc spinning behind the tilt screen. It is a normal operation after
the RKE is used to unlock the vehicle or when the driver's door has been opened. This noise will also be heard during vehicle operation and up to three
minutes after the vehicle has been turned off and driver's door has been opened and closed.
MAP Disc Accessing "ZIP" sound - As the Navigation Radio accesses the MAP Disc, the customer may describe frequent "zip" type noises. This noise
is caused by the CD Read Lens moving across the disc to access needed data for proper MAP display. To determine if the source of the noise is from
accessing the MAP Disc, remove the MAP Disc to determine if the noise continues. With the addition of the Real Time NAV Traffic Feature, the MAP
CD may be accessed to a greater extent thus resulting in additional MAP Drive noise.
Inform the customer about these noises. If the customer believes the noise is not normal, compare the condition to a like vehicle with identical settings to
determine if there is a noticeable difference.
Do not replace the radio as the described conditions are normal operating characteristics.
Disclaimer
