Diagnostic System Check - Vehicle
Always perform the Diagnostic System Check - Vehicle before proceeding
with these diagnostic procedures. Refer to
Diagnostic System Check - Vehicle
in Vehicle DTC Information.
Schematic Reference:
Radio/Audio 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
in Wiring Systems.
Without RPO UZ6 (ION) or RPO WBM (VUE)
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
in Wiring Systems. If no shorts are located, replace the
radio. Refer to
Radio Replacement
.
With RPO UZ6 (ION) or RPO WBM (VUE)
- 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
in
Wiring Systems.
- Ground to the amplifier open--Test the ground circuit to the amplifier
for an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- 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
in Wiring Systems. 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
in Wiring
Systems.
- Defective amplifier--Replace the amplifier. Refer to
Radio Speaker Amplifier Replacement
.