Each of the audio output channel circuits (+) and (-), at the radio and at the amplifier (if equipped) have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher.

The radio is ON.

A short to voltage or short to ground is detected on the specified (+) or (-) signal circuit.

The radio disables audio output on the appropriate channel.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Radio ON, adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and even sound.

Note: If equipped with rear seat audio (RSA), the RSA must be turned off to perform proper speaker testing.

Without Amplifier or RSA

1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

3. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

4. If all circuits test normal, test or replace the speaker.

Without Amplifier with RSA -- Front Speaker Testing

1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

3. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

4. If all circuits test normal, replace the speaker.

Without Amplifier with RSA -- Rear Speaker Testing

1. Ignition OFF, disconnect the CJ2 harness connector at the HVAC Control Module.
2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

•	Left rear low level audio signal (+) - terminal B3

•	Left rear low level audio signal (-) - terminal B7

•	Right rear low level audio signal (+) - terminal B4

•	Right rear low level audio signal (-) - terminal B8

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

3. Ignition OFF, disconnect the harness connector at the appropriate speaker.
4. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC Control Module.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC Control Module.

5. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC Control Module.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC Control Module.

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

With Amplifier - Front and Rear Speaker Testing

1. Ignition OFF, disconnect the X1 harness connector at the amplifier.
2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

•	Left front low level audio signal (+) - terminal B10 X1

•	Left front low level audio signal (-) terminal B9 X1

•	Right front low level audio signal (+) - terminal B8 X1

•	Right front low level audio signal (-) - terminal B7 X1

•	Left rear low level audio signal (+) - terminal B6 X1

•	Left rear low level audio signal (-) - terminal B5X1

•	Right rear low level audio signal (+) - terminal B4 X1

•	Right rear low level audio signal (-) - terminal B3 X1

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

3. If all circuits test normal, replace the amplifier.

With Amplifier and RSA - Front and Rear Speaker Testing

1. Ignition OFF, disconnect the X1 harness connector at the amplifier.
2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

•	Left front low level audio signal (+) - terminal B10

•	Left front low level audio signal (-) terminal B9

•	Right front low level audio signal (+) - terminal B8

•	Right front low level audio signal (-) - terminal B7

•	Left rear low level audio signal (+) - terminal B6

•	Left rear low level audio signal (-) - terminal B5

•	Right rear low level audio signal (+) - terminal B4

•	Right rear low level audio signal (-) - terminal B3

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

3. Ignition OFF, reconnect the X1 harness connector at the amplifier.
4. Disconnect the CJ2 harness connector at the HVAC Control Module.
5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

•	Left rear low level audio signal (+) - terminal B3

•	Left rear low level audio signal (-) - terminal B7

•	Right rear low level audio signal (+) - terminal B4

•	Right rear low level audio signal (-) - terminal B8

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

6. Ignition OFF, reconnect the CJ2 harness connector at the HVAC Control Module.
7. Disconnect the X1 harness connector at the amplifier.
8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

•	Left rear low level audio signal (+) - terminal B6

•	Left rear low level audio signal (-) - terminal B5

•	Right rear low level audio signal (+) - terminal B4

•	Right rear low level audio signal (-) - terminal B3

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA) module.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear seat audio (RSA) module.

9. If all circuits test normal, replace the amplifier.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.