• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Left Front Speaker Signal Circuit | B1025* | 1 | B1025* | -- |
Right Front Speaker Signal Circuit | B1025* | 1 | B1025* | -- |
Left Rear Speaker Signal Circuit | B1025* | 1 | B1025* | -- |
Right Rear Speaker Signal Circuit | B1025* | 1 | B1025* | -- |
1. No or reduced audio. * Noticeable audio distortion possible. |
Each of the audio output channel circuits (+) and (-), at the radio has 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. When equipped with the DVD player, the rear audio circuits from the radio pass through the DVD player an then go to the rear speakers.
• | Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item. |
• | Tweeter speakers are connected to the same channel as the door speakers. |
Radio/Navigation System Schematics
Entertainment/Communication Connector End Views
Radio ON, DVD Player OFF (if equipped), 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.
Radio ON, verify clear audio is heard from each audio speaker.
⇒ | If audio is inoperative from all speakers, replace the radio. |
⇒ | If audio is inoperative from one or more, but not all, speakers or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction. |
Note: If equipped with a Digital Video Disc player (DVD), the DVD must be turned off to perform proper speaker testing.
⇒ | 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. |
⇒ | 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. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio. |
• | Left rear low level audio signal (+) - terminal 3 |
• | Left rear low level audio signal (-) - terminal 4 |
• | Right rear low level audio signal (+) - terminal 5 |
• | Right rear low level audio signal (-) - terminal 6 |
⇒ | 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. |
⇒ | 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. |
⇒ | 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. |
⇒ | 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. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD player. |
⇒ | 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. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD player. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for Radio replacement, setup, and programming. |