February 2005 GM Techlink
Here's some interesting notes within this publication:
Star Washers in Grounds
This information applies to 1996-2005 passenger cars, trucks and utilities.
In the past, star washers have been used under most ground connections. It was believed using a star washer would improve continuity to ground and prevent the ground fastener from becoming loose.
GM Engineering has determined that installing a star washer increases the chance for corrosion and prevents the terminal from achieving proper torque. On vehicles being built today, star washers are not being used under any ground connection.
It is recommend NOT to use a star washer on any ground connection to the body or chassis of the vehicle.
TIP: Be sure the fastener and terminal are clean and corrosion free. When removing corrosion, be careful not to remove the plating from the terminal. And be sure to torque the fastener to the proper specification.
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Navigation Radio Hum
This information applies to 2003-05 Chevrolet/GMC/Cadillac/Hummer H2 Full Size Utilities with RPO UM8.
Customers may comment of a hum or fan running type noise from the navigation radio.
This sound is normal. The navigation radio has an internal cooling fan to cool the radio's internal components.
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Navigation DVD
This information appllies to the following 2004-05 vehicles with the UM8 Navigation Radio Sound System:
- Buick Rendezvous and Rainier
- Cadillac Escalade, ESV, and EST
- Chevrolet Avalanche, Tahoe, Suburban, TrailBlazer and EXT
- GMC Yukon, XL, Denali, Envoy, XL and XUV
- HUMMER H2 SUVand SUT
Customers may comment that their navigation radio system does not have complete coverage for their area. This may be due to recent construction, or changes to public access roads or highways.
2005 model vehicles should contain the latest navigation DVD disk release, version 3.0 (fig. 10). If not, refer to service bulletin 04-08-126-001.
2004 model vehicles should contain an earlier navigation DVD disk release, such as version 2.0.
TIP: The New Vehicle Warranty does not cover cases in which the customer requests an updated navigation DVD.
However, customers can purchase the DVD disk, release version 3.0, under part number 10390370.
Here's some interesting notes within this publication:
Star Washers in Grounds
This information applies to 1996-2005 passenger cars, trucks and utilities.
In the past, star washers have been used under most ground connections. It was believed using a star washer would improve continuity to ground and prevent the ground fastener from becoming loose.
GM Engineering has determined that installing a star washer increases the chance for corrosion and prevents the terminal from achieving proper torque. On vehicles being built today, star washers are not being used under any ground connection.
It is recommend NOT to use a star washer on any ground connection to the body or chassis of the vehicle.
TIP: Be sure the fastener and terminal are clean and corrosion free. When removing corrosion, be careful not to remove the plating from the terminal. And be sure to torque the fastener to the proper specification.
------------
Navigation Radio Hum
This information applies to 2003-05 Chevrolet/GMC/Cadillac/Hummer H2 Full Size Utilities with RPO UM8.
Customers may comment of a hum or fan running type noise from the navigation radio.
This sound is normal. The navigation radio has an internal cooling fan to cool the radio's internal components.
------------
Navigation DVD
This information appllies to the following 2004-05 vehicles with the UM8 Navigation Radio Sound System:
- Buick Rendezvous and Rainier
- Cadillac Escalade, ESV, and EST
- Chevrolet Avalanche, Tahoe, Suburban, TrailBlazer and EXT
- GMC Yukon, XL, Denali, Envoy, XL and XUV
- HUMMER H2 SUVand SUT
Customers may comment that their navigation radio system does not have complete coverage for their area. This may be due to recent construction, or changes to public access roads or highways.
2005 model vehicles should contain the latest navigation DVD disk release, version 3.0 (fig. 10). If not, refer to service bulletin 04-08-126-001.
2004 model vehicles should contain an earlier navigation DVD disk release, such as version 2.0.
TIP: The New Vehicle Warranty does not cover cases in which the customer requests an updated navigation DVD.
However, customers can purchase the DVD disk, release version 3.0, under part number 10390370.