Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Description and Operation

Navigation System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References

Important: Verify the radio is operating normally before performing this diagnostic. If audio distortion is present, refer to Speakers Inoperative - One or More

1. Inspect the TV antenna grid for damage and that each of the TV antennas are connected.

⇒	If damage is found, replace the rear glass.

2. Ignition OFF, disconnect all TV antenna leads from the rear glass.
3. Ignition ON, rear defog/defrost ON, test for less than 1 volt on each of the antenna lead connectors on the rear glass.

⇒	If greater then specified value, replace the rear glass.

4. Ignition OFF, disconnect the TV antenna leads at the rear glass and the TV antenna amplifier and test each antenna lead for infinite resistance to ground.

⇒	If less than specified value, replace the appropriate antenna lead.

5. Disconnect both end of the antenna leads from the rear glass and the antenna amplifier and test for less than 5 ohms between both ends of each antenna lead.

⇒	If greater than specified value, replace the appropriate antenna lead.

6. Ignition OFF, disconnect the antenna coaxial cables between the TV antenna amplifier and the TV antenna module.
7. Test for less than 5 ohms between the coaxial center conductors.

⇒	If greater than specified value, replace the TV antenna coaxial cable.

8. Test for less than 5 ohms between the coaxial outer shield conductors.

⇒	If greater than specified value, replace the TV antenna coaxial cable.

9. Reconnect all of the coaxial cables at the TV antenna amplifier and the TV antenna module.
10. Disconnect the C3 harness connector from the radio.
11. Ignition ON, radio ON, tune the TV in to a known good station. Test each of the following circuits test for a varying mV AC voltage reading between the following signal circuit terminals listed below and ground an open, short to ground, or a short to voltage.

•	Left audio circuit terminal 4

•	Right audio circuit terminal 1

•	Common audio circuit terminal 3

⇒	If the voltage reading is not as specified, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the TV antenna module.

12. Reconnect the C3 harness connector at the radio and disconnect the C4 connector.
13. Ignition ON, radio ON, tune the TV in to a known good station. Test each of the following circuits test for a varying mV AC voltage reading between the following signal circuit terminals listed below and ground an open, short to ground, or a short to voltage.

•	Video Red Signal (+) terminal 6

•	Video Red Signal (-) terminal 7

•	Video Green Signal (+) terminal 8

•	Video Green Signal (-) terminal 9

•	Video Blue Signal (+) terminal 10

•	Video Blue Signal (-) terminal 11

•	Video Synchronization Signal (+) terminal 20

•	Video Synchronization Signal (-) terminal 21

⇒	If the voltage reading is not as specified, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the TV antenna module.

14. If all circuits test normal replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.