Circuit/System Testing
WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the antenna.
- Radio ON, verify that a test lamp illuminates between the signal circuit terminal 1 and ground.
- If test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition OFF, disconnect the radio antenna coax cable from the radio and the radio antenna.
- Test for infinite resistance between the antenna coax center terminal and ground.
- If less than the specified value, replace the antenna coax.
- Test for less than 5 Ω on the antenna coax center terminal from end to end.
- If greater than the specified range, replace the antenna coax.
- Test for less than 5 Ω on the antenna coax outer shield from end to end.
- If greater than the specified range, replace the antenna coax.
- Test for infinite resistance between the coax center terminal and the outer shield.
- If less than the specified value, replace the antenna coax.
- If all circuits test normal, replace the radio antenna.
- If reception is still poor, replace the radio.