For 1990-2009 cars only
Schematic Reference: Radio/Audio System Schematics
Diagnostic System Check - Vehicle
Always perform the Vehicle Diagnostic System Check before proceeding with these diagnostic procedures. Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information.
Speakers - Reduced Volume
Important: The following information lists the most probable cause of the concern to the least probable cause. If the list leads to the replacement of a component, always inspect for a poor connection before proceeding with replacement. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Without RPO UQA
| • | Speaker output circuit high resistance--Test the appropriate speaker output circuits for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. |
| • | Defective speaker--Replace the appropriate speaker. Refer to Speaker Replacement Reference . |
With RPO UQA (Bose)
| • | Speaker output circuit high resistance--Test the appropriate speaker output circuits for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. |
| • | Front low level audio circuit open--Test the appropriate low level audio circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. |
| • | Defective speaker--Replace the appropriate speaker. Refer to Speaker Replacement Reference . |
