Radio Antenna Module Test
WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect each radio antenna module grounding surface and the mounting hardware for any corrosion that may cause a poor ground.
- If corrosion is noted, clean the grounding surfaces and hardware.
- Ignition OFF, disconnect the harness connector at the left radio antenna module.
- Radio ON, test for B+ between the signal circuit terminal 1 and ground.
- If less than the specified value, 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 X1 harness connector at the radio.
- Disconnect the harness connector at the right radio antenna module.
- Verify that a test lamp does not illuminate between B+ and the FM corporate signal circuit terminal 1.
- If the test lamp illuminates, test the signal circuit for a short to ground.
- Test for less than 5 ohms between the FM corporate signal circuit terminal 12 at the X1 radio harness connector and terminal 1 at the right radio antenna module harness connector.
- If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
- Ignition ON, with the scan tool observe and record the radio signal strength db parameter.
- Disconnect the left antenna from the left radio antenna module and verify a drop in db signal strength.
- If the signal strength did not significantly drop, replace the left antenna.
- Connect the harness connector at the left antenna.
- Disconnect the right antenna from the right radio antenna module and verify a drop in db signal strength.
- If the signal strength did not significantly drop, replace the right antenna.
- If all circuits test normal, replace the radio antenna module assembly.