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 GPS satellites to acquire vehicle signal.

Ignition ON.
Verify that no DTCs are set.
- If any DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- If no DTCs are set
Verify that 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 radio
  Refer to Circuit/System Testing (without Navigation Radio) .
- If the advisor can not locate the vehicle and the vehicle is equipped with a navigation radio
  Refer to Circuit/System Testing (with Navigation Radio) .
- If the advisor can locate the vehicle
Verify that the NO GPS symbol/message is not displayed on the radio.
- If the NO GPS symbol/message is displayed
  Refer to Circuit/System Testing (with Navigation Radio) .
- If the NO GPS symbol/message is not displayed
All OK.