Disclaimer2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 06-08-44-034E Date: 110211

Disclaimer2010 Cadillac Truck Escalade EXT AWD V8-6.2L Technical Service Bulletin # 06-08-44-034E Date: 110211

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

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 213

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.