Circuit/System Verification

NOTE:

The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the vehicle to acquire the GPS satellites signal.

Ignition ON/vehicle in Service Mode.
Verify that DTC B2462 is not set in the Telematics Communication Interface Control Module.
- If DTC B2462 is set in the Telematics Communication Interface Control Module and the vehicle is not equipped with a navigation system
  Refer to Circuit/System Testing Without Navigation System.
- If DTC B2462 is set in the Telematics Communication Interface Control Module and the vehicle is equipped with a navigation system
  Refer to Circuit/System Testing With Navigation System.
- If DTC B2462 is not set in the Telematics Communication Interface Control Module
Verify an OnStar advisor can locate the vehicle after performing a blue button press.
- If the advisor can not locate the vehicle and the vehicle is not equipped with a navigation system
  Refer to Circuit/System Testing Without Navigation System
- If the advisor can not locate the vehicle and the vehicle is equipped with a navigation system
  Refer to Circuit/System Testing With Navigation System.
- If the advisor can locate the vehicle
Verify DTC B2462 is not set in the Human Machine Interface Control Module.
- If DTC B2462 is set in the Human Machine Interface Control Module
  Refer to Circuit/System Testing With Navigation System - Step 9.
- If DTC B2462 is not set in the Human Machine Interface Control Module
Verify that the NO GPS symbol/message is not displayed on the radio display.
- If the NO GPS symbol/message is displayed
  Refer to Circuit/System Testing With Navigation System - Step 9.
- If the NO GPS symbol/message is not displayed
All OK.