Schematic Reference:
Radio/Audio System Schematics
All Speakers Inoperative
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.
With RPO U62
- Speaker output shorted - Test all speaker outputs for a short. Refer
to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- Defective Radio - Replace Radio. Refer to
Radio Replacement
.
With RPO UQ3
- Battery positive voltage circuit to the amplifier open. Test the battery
positive voltage circuit to the amplifier for an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- Ground circuit to the amplifier open. Test the ground circuit to the
amplifier for an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- Antenna enable signal circuit to the amplifier open or shorted to ground.
Test the antenna enable signal circuit for an open or short to ground. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the amplifier. Replace the amplifier. Refer to
Radio Speaker Amplifier Replacement
.
Important: The following procedure assumes all speakers are operative for all modes of
operation except digital radio.
With RPO U2K or U2L
- Remote radio audio signal circuit shorted. Test the remote radio audio
signal circuits for a short. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the digital radio receiver. Replace the digital radio
receiver. Refer to
Digital Radio Receiver Replacement
and
Digital Radio Receiver Setup
.
- No digital radio audio output from the radio. Replace the radio. Refer
to
Radio Replacement
.
One Speaker Inoperative
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.
With RPO U62
- Speaker output open. Test the appropriate speaker output circuits for
an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the radio. Test for any AC voltage between the appropriate
speaker output circuits at the speaker harness connector, disconnected with the radio
volume adjusted to 50 percent. If AC voltage is present, replace the speaker. Refer
to
Speaker Replacement Reference
. If no AC
voltage is present, replace the radio. Refer to
Radio Replacement
.
With RPO UQ3
- Speaker output circuit from amplifier open. Test the appropriate speaker
output circuits for an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring
Systems.
- No audio output from the amplifier. Test for any AC voltage between
the appropriate speaker output circuits at the speaker harness connector, disconnected
with the radio volume adjusted to 50 percent. If AC voltage is present, replace
the speaker. Refer to
Speaker Replacement Reference
.
If no AC voltage is present, replace the amplifier. Refer to
Radio Speaker Amplifier Replacement
.
Speakers - One Channel Inoperative
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.
With RPO UQ3
- Speaker output circuit from amplifier shorted. Test the appropriate
speaker output circuits for a short. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the amplifier. Test for any AC voltage between
the appropriate speaker output circuits at the speaker harness connector, disconnected
with the radio volume adjusted to 50 percent. If AC voltage is present, replace
the speaker. Refer to
Speaker Replacement Reference
.
If no AC voltage is present, replace the amplifier. Refer to
Radio Speaker Amplifier Replacement
.
Important: The following procedure assumes all speakers are operative for all modes of
operation except digital radio.
With RPO U2K or U2L
- Remote radio audio signal circuit open. Test the appropriate remote radio
audio signal circuit for an open. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the digital radio receiver. Replace the digital radio
receiver. Refer to
Digital Radio Receiver Replacement
and
Digital Radio Receiver Setup
.
- No digital radio audio output from the radio. Replace the radio. Refer
to
Radio Replacement
.
Speakers - Reduced Volume / Audio Distortion
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.
With RPO U62
- 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 UQ3
- Speaker output circuit high resistance. Test the appropriate speaker
output circuits from the audio amplifier for high resistance. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- Defective speaker - Replace the appropriate speaker. Refer to
Speaker Replacement Reference
.
Important: The following procedure assumes all speakers are operative for all modes of
operation except digital radio.
With RPO U2K or U2L
- Audio common circuit open. Test the audio common circuit for an open.
Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems.
- No audio output from the digital radio receiver. Replace the digital radio
receiver. Refer to
Digital Radio Receiver Replacement
and
Digital Radio Receiver Setup
.
- No digital radio audio output from the radio. Replace the radio. Refer
to
Radio Replacement
.