The vehicle navigation radio provides verbal directions to the driver through the radio speakers. The navigation radio sends an audio voice signal to the amplifier on two dedicated circuits.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, disconnect the radio harness connector C1 and amplifier harness connector C3.
2. Ignition ON, test for less than 1 volt on the radio harness terminals listed below and ground:

•	Navigation audio signal (+) - terminal 4

•	Navigation audio signal (-) - terminal 16

⇒	If greater than specified value, test the signal circuit for a short to voltage.

3. Test for greater than 1 ohm between the radio harness terminals listed below and ground:

•	Navigation audio signal (+) - terminal 4

•	Navigation audio signal (-) - terminal 16

⇒	If less than specified value, test the signal circuit for a short to ground.

4. Test for less than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 4 and the amplifier harness connector terminal 10.

⇒	If greater than specified value, test for an open/high resistance.

5. Test for less than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 16 and the amplifier harness connector terminal 9.

⇒	If greater than specified value, test for an open/high resistance.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming