Diagnostic System Check - Vehicle
Always perform the Diagnostic System Check - Vehicle before proceeding with these diagnostic procedures. Refer to Diagnostic System Check - Vehicle .
Schematic Reference: Radio/Navigation System Schematics
Important: The following information lists the most probable cause of the concern to the least probable cause, followed by the appropriate test for that condition. If the list leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Without RPO UZ6 or RPO WBM
No audio output from the radio--Test for any AC voltage between the left front audio signal circuits at the left front speaker connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive or shorts to ground on any speaker output circuit from the radio. Refer to Circuit Testing and Wiring Repairs . If no shorts are located, replace the radio. Refer to Radio Replacement .
With RPO UZ6 or RPO WBM
- Battery positive voltage to the amplifier open--Test the battery positive circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs .
- Ground to the amplifier open--Test the ground circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs .
- No low level audio output from the radio--Test for any AC voltage between the left front low level audio signal circuits at the amplifier connector with the radio volume adjusted to 50 percent. If no AC voltage is present, check for shorts to battery positive or shorts to ground on any speaker output circuit from the radio. Refer to Circuit Testing and Wiring Repairs . If no shorts are located, replace the radio. Refer to Radio Replacement .
- No radio on signal to the amplifier--Test the radio on signal circuit to the amplifier for an open. Refer to Circuit Testing and Wiring Repairs .
- Defective amplifier--Replace the amplifier. Refer to Radio Speaker Amplifier Replacement .
