• | 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 provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Speaker Output Signal (+) | B1025* | 1 | B1025* | -- |
Speaker Output Signal (-) | B1025* | 1 | B1025* | -- |
1. No or reduced sound from speaker * 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.
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.
• | A current DTC will clear when the conditions for setting are no longer seen. |
• | A history DTC will clear after 100 malfunction-free ignition cycles. |
Radio/Navigation System Schematics
Radio/Audio System Description and Operation
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 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 or Amplifier replacement, setup, and programming |