Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The global positioning system requires a clear line of sight to the sky to operate properly. In most cases the GPS will not have reception near tall buildings or inside structures.
- Ignition OFF, disconnect the global positioning system antenna coax cable from the A11 radio.
- Ignition ON, radio ON, test for 4.5-5.5 V between the GPS coax cable connection center conductor on the radio and ground.
- If not within the specified range, replace the A11 radio.
- Ignition OFF, reconnect the antenna coax cable at the A11 radio. Disconnect the antenna coax cable from the T4E global positioning system antenna.
- Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and outer shield.
- If less than the specified range, test the antenna coax cable for an open/high resistance.
- If greater than the specified range, test the antenna coax cable for a short to voltage.
- If all circuits test normal, replace the T4E global positioning system antenna.