Radio Antenna Module System
IMPORTANT:
The following information lists the most probable cause of the concern to the least probable cause followed by the appropriate test for that condition. If the test leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
.
This antenna system consists of an antenna module and a mast antenna.
Perform the Antenna System Test and test the antenna coax cable prior to performing the following tests:
- The radio antenna module is not grounded properly. The module grounding screws should be clean and tight. Measure the resistance from the antenna module base plate to a good ground. Resistance should be 0.02 ohm or less. Find and correct the condition if the resistance is out of specification.
- The antenna module supply voltage circuit to the radio antenna module is open or shorted to ground. Test the antenna module supply voltage circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .
- No antenna module supply voltage output from the radio. Disconnect the radio antenna module connector. Turn ON the radio and measure the voltage from the antenna module supply voltage circuit of the radio to a good ground. Voltage measured should be near 12 volts. If no voltage is measured, replace the radio. Refer to Radio Replacement for service procedure. Perform the VIN Relearn procedure after replacing the radio. On the scan tool, go to Module Replacement/Setup in Vehicle Control Systems and select Radio.
- Defective radio antenna module. Replace the radio antenna module.
- After finding and correcting the condition, operate the system in order to verify the repair.