The radio head unit provides 4 discrete channels to the speakers. Each channel consists of 2 wires that connect to a speaker. During normal operation, the radio applies approximately 5-6 volts to the plus (+) and minus (-) terminals at the speaker. The terminals attach to the speaker voice coil.

In order for the speaker to produce sound, the amplifier in the radio will raise the voltage on one terminal and lower the voltage on the opposite terminal, then quickly reverse the polarity. The constant switching of the electrical signal causes the voice coil and speaker cone to move rapidly in 2 directions. The movement of the speaker cone produces sound.

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

Special Tools Required

J 39916-A CD and Cassette Diagnostic Audio Kit

Without Amplifier

Ignition ON and radio ON, Adjust the fade and balance controls to mid range and insert the CD from the J 39916-A to identify the suspect speaker.

With Amplifier

1. Turn ON the ignition, with the engine OFF, and turn ON the radio. Adjust the fade and balance controls to mid range and insert the CD from the J 39916-A to identify the suspect speaker.
2. Disconnect the suspect speaker harness connector.
3. Ignition ON, test for greater than 10 volts on the suspect (+) audio output signal circuit and (-) audio output signal circuit.

⇒	If greater than specified value repair short to voltage.

4. Ignition OFF, test for greater than 1 ohm between the suspect (+) audio output signal circuit and (-) audio output signal circuit and ground.

⇒	If less than specified value repair short to ground.

5. If all circuits test normal, replace suspect speaker.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Speaker Replacement Reference