Radio Antenna Module Test

WARNING: This page is about a different car, the 2007 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