Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Important: Perform the Audio System Troubleshooting Hints to properly identify the customers concern before using this diagnostic.

1. Disconnect the antenna harness connector.
2. Ignition ON and radio ON, test for greater than 9 volts on the antenna connector terminal 1.

⇒	If less than specified voltage repair short to ground or open/high resistance or replace the radio.

3. Reconnect the antenna harness connector.
4. Ignition OFF, disconnect the coax cable from the radio.
5. Verify there is less than 0.20 ohms between the negative battery cable and the coaxial cable metal outer shield.

⇒	Repair connection between the antenna base mounting and vehicle body or replace the coaxial cable.

6. Disconnect the coax cable from the antenna . With a DMM, verify there is less than 3.5 ohms between the radio end coaxial cable conductor and the antenna module end coaxial cable conductor.

⇒	If greater than 3.5 ohms, replace the coax cable.

7. Reconnect the coax cable to the radio and the antenna and radio.
8. Ignition ON and radio ON, with the scan tool observe and record the signal strength dBuV in the radio data list.
9. Disconnect the coax cable from the radio antenna and observe the dBuV for a drop in signal strength.

⇒	If the dBuV displayed on the scan tool did not drop signal strength with the antenna unplugged, replace the antenna.

10. If all circuits test normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.