Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Antenna Circuit Testing

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 10 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 10 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.
Reconnect the coax to the radio antenna. Test for infinite resistance on the coax at the radio between the center terminal and the outer shield.
- If less then specified value, replace the antenna.
Test for less than 10 Ω on the coax at the radio between the outer shield and ground.
- If greater than specified value, clean the mounting surface of the antenna ground plane. If no corrosion found, replace the antenna.
If all circuits test normal, replace the radio.