Diagnostic Information on Navigation Radio Aftermarket Modules Causing Various LAN Communication Concerns/DTCs, No Crank, Vehicle Stability Lights/Messages, TPM Warning Lights, PRNDL Position Errors
| Subject: | Diagnostic Information on Navigation Radio Aftermarket Modules Causing Various LAN Communication Concerns and DTCs, No Crank, Vehicle Stability Lights and Messages, TPM Warning Lights, PRNDL Position Errors |
| Models: | 2007 Cadillac Escalade Models |
| 2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2007 GMC Yukon Models |
Some customers may comment of one or more of the following concerns:
| • | Vehicle will not crank. |
| • | Vehicle cranks but will not start. |
| • | Vehicle stability enhancement system warning lights and messages. |
| • | PRNDL gear indicator position errors. |
| • | Tire Pressure Monitor (TPM) system warning lights. |
Technicians may find various Local Area Network (LAN) communication Diagnostic Trouble Codes (DTC) and no low speed LAN communications with the Tech 2®.
These conditions may be caused by the installation of an aftermarket navigation radio module.
It has been brought to our attention that some customers may be installing and using certain aftermarket products that are used in conjunction with the factory navigation radio systems.
The product allows the user to display the video output of the DVD player on the navigation screen. Normally the DVD output is only available on the navigation display when the vehicle is placed in PARK. The product allows an aftermarket camera or second backup camera and enables navigation functions that are only available in PARK.
Dealers have found that these products can cause unusual problems that are difficult to diagnose. These products may be difficult to identify because they are installed behind the navigation unit and are not visible unless the navigation unit is removed.
If you suspect that the customer has installed aftermarket products of this nature and you suspect that the product may be the cause of the concern, you should ask the customer if any vehicle modifications have been made.
Additionally, if the customer's information is not available, you may want to test the navigation and DVD system to see if normally blocked functions are available with the vehicle in DRIVE. Removal of the navigation radio will also allow you to verify if one of these products has been installed.
Warranty Information
Warranty coverage does not extend to problems created by aftermarket devices. Damage to normally covered systems caused by aftermarket products is the responsibility of the customer or the aftermarket installer.
