Information on Noise from Navigation Radio - Normal Operating Characteristics
| Subject: | Information on Noise from Navigation Radio -- Normal Operating Characteristics |
| Models: | 2007-2009 Cadillac DTS, Escalade, Escalade ESV, Escalade EXT, SRX |
| 2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2007-2009 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL |
| 2007-2009 HUMMER H2 |
This bulletin is being revised to add the 2009 model year and update the models to include HUMMER H2. Please discard Corporate Bulletin Number 06-08-44-034A (Section 08 -- Body and Accessories).
Some customers may comment that there is unusual or unwanted noise coming from the navigation radio. 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.
Do not replace the radio as the described conditions are normal operating characteristics.
