Speaker Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
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Signal Performance
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Amplifier B+
|
-
|
1
|
-
|
-
|
Powered Subwoofer B+
|
-
|
4
|
-
|
-
|
Left Front Low Level Audio Signal
|
B1025 02, *
|
B1025 04, *
|
B1025 01, *
|
-
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Right Front Low Level Audio Signal
|
B1035 02, *
|
B1035 04, *
|
B1035 01, *
|
-
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Left Rear Low Level Audio Signal
|
B1045 02, *
|
B1045 04, *
|
B1045 01, *
|
-
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Right Rear Low Level Audio Signal
|
B1055 02*
|
B1055 04*
|
B1055 01, *
|
-
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Subwoofer Left Low Level Aduio Signal
|
B1045 02, *
|
2
|
B1045 01, *
|
-
|
Subwoofer Right Low Level Aduio Signal
|
B1055 02*
|
2
|
B1055 01, *
|
-
|
Center Low Level Audio Signal
|
3
|
3
|
3
|
-
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Powered Subwoofer Ground
|
-
|
4
|
-
|
-
|
Amplifier Ground
|
-
|
1
|
-
|
-
|
1. Amplifier inoperative/no sound from subwoofers.
2. No or reduced sound from subwoofer.
3. No sound from center speaker.
4. Powered Subwoofer inoperative.
* Noticeable audio distortion possible.
|
|
|
Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the
radio and audio amplifier have 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. The audio amplifer can not set DTCs. The
base audio system has a powered subwoofer that shares the audio
outputs for the rear speakers.
Diagnostic Aids
• |
Improper speaker mounting or
loose trim may cause an audible buzz or distortion. Inspect the
appropriate speaker and the surrounding interior trim for proper
and secure mounting. If the speaker or surrounding interior trim is
found to be loose or improperly secured, correctly secure the
item. |
• |
When equipped with an
amplifier, it is possible for some individual circuit faults to
affect more than one speakers operation. Perform diagnostic tests
in the sequence listed to avoid misdiagnosis. |
• |
The amplifier control circuit
has less than 1V when the mute function is OFF, and will have 4-6V
DC when at full mute. |
Reference Information
Schematic Reference
Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Radio/Audio System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Radio ON, Mute OFF, verify clear audio is heard from each audio
speaker.
If audio is inoperative from all speakers, refer to Amplifier
Circuit Malfunction. If audio is inoperative from one or more, but
not all, speakers or the audio emitted from the speakers is not
clear, refer to the appropriate Speaker Circuit Malfunction.
Circuit/System Testing
Note: If equipped with
surround sound, the surround sound should be turned OFF for proper
voltage values when performing speaker testing.
Amplifier Circuit Malfunction - UQA
1. |
Ignition OFF, disconnect the
X1 harness connector at the audio amplifier. |
2. |
Ignition OFF, test for less
than 10 Ω between the ground circuit terminal 8 and
ground. |
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
3. |
Ignition ON, test for B+
between the B+ circuit terminal 4 and ground. |
⇒ |
If less then specified value, test the circuit for
a short to ground, or an open/high resistance. |
4. |
Ignition OFF, disconnect the
X3 harness connector at the audio amplifier. |
5. |
Radio ON, test for B+ between
the signal circuit terminal 1 and ground. |
⇒ |
If less than the specified value, test the control
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the radio. |
6. |
Radio ON, test for less than 1
V between the amplifier control circuit terminal 11 and
ground. |
⇒ |
If greater than the specified range, test the
control circuit for a short to voltage. If the circuit tests
normal, replace the radio. |
7. |
If all circuits test normal,
replace the audio amplifier. |
Amplified Subwoofer Circuit Malfunction
1. |
Ignition OFF, disconnect the
harness connector at the amplified subwoofer. |
2. |
Ignition OFF, test for less
than 10 Ω between the ground circuit terminal 8 and
ground. |
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
3. |
Ignition ON, test for B+
between the B+ circuit terminal 16 and ground. |
⇒ |
If less then specified value, test the circuit for
a short to ground, or an open/high resistance. |
4. |
Radio ON, test for B+ between
the signal circuit terminal 7 and ground. |
⇒ |
If less than the specified value, test the control
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the radio. |
5. |
Radio ON, test for 4-8 V
between the signal circuit terminals listed below and
ground. |
|
• |
Left rear low level audio
signal (+) - terminal 10 |
|
• |
Left rear low level audio
signal (-) - terminal 9 |
|
• |
Right rear low level audio
signal (+) - terminal 2 |
|
• |
Right rear low level audio
signal (-) - terminal 1 |
⇒ |
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. |
6. |
If all circuits test normal,
replace the amplified subwoofer. |
Without Amplifier - Front Speaker Testing
1. |
Ignition OFF, disconnect the
harness connector at the appropriate speaker. |
2. |
Radio ON, test for 4-8 V
between the signal circuit terminal A and ground. |
⇒ |
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. |
3. |
Test for 4-8 V between the
signal circuit terminal B and ground. |
⇒ |
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. |
4. |
If all circuits test normal,
replace the speaker. |
Without Amplifier - Rear Speaker Testing
1. |
Ignition OFF, disconnect the
harness connector at the appropriate speaker and the
subwoofer. |
2. |
Radio ON, test for 4-8 V
between the signal circuit terminal A and ground. |
⇒ |
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. |
3. |
Test for 4-8 V between the
signal circuit terminal B and ground. |
⇒ |
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. |
4. |
Ignition OFF, reconnect the
subwoofer harness connector. |
5. |
Radio ON, test for 4-8 V
between the signal circuit terminal A and ground at the appropriate
speaker. |
⇒ |
If not within the specified range, replace the
subwoofer. |
6. |
Test for 4-8 V between the
signal circuit terminal B and ground at the appropriate
speaker. |
⇒ |
If not within the specified range, replace the
subwoofer. |
7. |
If all circuits test normal,
replace the appropriate speaker. |
Speaker Malfunction Radio Output Testing - UQA - LHD
1. |
Ignition OFF, disconnect the
X3 harness connector at the amplifier. |
2. |
Radio ON, test for 4-8 V
between the appropriate signal circuit terminal listed below and
ground. |
|
• |
Left front low level audio
signal (+) - terminal 15 |
|
• |
Left front low level audio
signal (-) - terminal 7 |
|
• |
Right front low level audio
signal (+) - terminal 14 |
|
• |
Right front low level audio
signal (-) - terminal 6 |
|
• |
Left rear low level audio
signal (+) - terminal 13 |
|
• |
Left rear low level audio
signal (-) - terminal 5 |
|
• |
Right rear low level audio
signal (+) - terminal 12 |
|
• |
Right rear low level audio
signal (-) - terminal 4 |
⇒ |
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. |
3. |
If all circuits test normal,
replace the amplifier. |
Speaker Malfunction Radio Output Testing - UQA - RHD
1. |
Ignition OFF, disconnect the
X3 harness connector at the amplifier. |
2. |
Radio ON, test for 4-8 V
between the appropriate signal circuit terminal listed below and
ground. |
|
• |
Left front low level audio
signal (+) - terminal 14 |
|
• |
Left front low level audio
signal (-) - terminal 6 |
|
• |
Right front low level audio
signal (+) - terminal 15 |
|
• |
Right front low level audio
signal (-) - terminal 7 |
|
• |
Left rear low level audio
signal (+) - terminal 12 |
|
• |
Left rear low level audio
signal (-) - terminal 4 |
|
• |
Right rear low level audio
signal (+) - terminal 13 |
|
• |
Right rear low level audio
signal (-) - terminal 5 |
⇒ |
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. |
3. |
If all circuits test normal,
replace the amplifier. |
Speaker Malfunction Amplifier Output Testing - UQA - LHD
1. |
Ignition OFF, disconnect the
X1 and X2 connectors at the amplifier. |
2. |
Radio ON, test for less than 1
volt between the appropriate signal circuit terminal listed below
and ground: |
|
• |
Left front speaker output (+)
- terminal 14 X2 |
|
• |
Left front speaker output (-)
- terminal 13 X2 |
|
• |
Right front speaker output (+)
- terminal 8 X2 |
|
• |
Right front speaker output (-)
- terminal 7 X2 |
|
• |
Front center speaker output
(+) - terminal 4 X2 |
|
• |
Front center speaker output
(-) - terminal 3 X2 |
|
• |
Left rear surround speaker
output (+) - terminal 16 X2 |
|
• |
Left rear surround speaker
output (-) - terminal 15 X2 |
|
• |
Right rear surround speaker
output (+) - terminal 2 X2 |
|
• |
Right rear surround speaker
output (-) - terminal 1 X2 |
|
• |
Left rear subwoofer speaker
output (+) - terminal 7 X1 |
|
• |
Left rear subwoofer speaker
output (-) - terminal 3 X1 |
|
• |
Right rear subwoofer speaker
output (+) - terminal 6 X1 |
|
• |
Right rear subwoofer speaker
output (-) - terminal 2 X1 |
⇒ |
If greater than the specified range, test both
circuits of the affected speaker for a short to voltage. |
3. |
Radio ON, test for infinite
resistance between the appropriate signal circuit terminal listed
below and ground: |
|
• |
Left front speaker output (+)
- terminal 14 X2 |
|
• |
Left front speaker output (-)
- terminal 13 X2 |
|
• |
Right front speaker output (+)
- terminal 8 X2 |
|
• |
Right front speaker output (-)
- terminal 7 X2 |
|
• |
Front center speaker output
(+) - terminal 4 X2 |
|
• |
Front center speaker output
(-) - terminal 3 X2 |
|
• |
Left rear surround speaker
output (+) - terminal 16 X2 |
|
• |
Left rear surround speaker
output (-) - terminal 15 X2 |
|
• |
Right rear surround speaker
output (+) - terminal 2 X2 |
|
• |
Right rear surround speaker
output (-) - terminal 1 X2 |
|
• |
Left rear subwoofer speaker
output (+) - terminal 7 X1 |
|
• |
Left rear subwoofer speaker
output (-) - terminal 3 X1 |
|
• |
Right rear subwoofer speaker
output (+) - terminal 6 X1 |
|
• |
Right rear subwoofer speaker
output (-) - terminal 2 X1 |
⇒ |
If less than the specified value, test both
circuits of the affected speaker for a short to ground. |
4. |
If all circuits test normal,
reconnect all harness connectors at the amplifier. |
5. |
Ignition ON, radio ON,
disconnect the appropriate speaker. |
6. |
Test for 4-8 V between the
signal circuit terminals and ground. |
⇒ |
If less then the specified range, test the circuit
for an open/high resistance. If the circuit tests normal, replace
the amplifier. |
⇒ |
If greater then the specified range, test the
circuit for a short to voltage. If the circuit tests normal,
replace the amplifier. |
7. |
If the circuit tests normal,
replace the speaker. |
Speaker Malfunction Amplifier Output Testing - UQA - RHD
1. |
Ignition OFF, disconnect the
X1 and X2 connectors at the amplifier. |
2. |
Radio ON, test for less than 1
volt between the appropriate signal circuit terminal listed below
and ground: |
|
• |
Left front speaker output (+)
- terminal 8 X2 |
|
• |
Left front speaker output (-)
- terminal 7 X2 |
|
• |
Right front speaker output (+)
- terminal 14 X2 |
|
• |
Right front speaker output (-)
- terminal 13 X2 |
|
• |
Front center speaker output
(+) - terminal 4 X2 |
|
• |
Front center speaker output
(-) - terminal 3 X2 |
|
• |
Left rear surround speaker
output (+) - terminal 2 X2 |
|
• |
Left rear surround speaker
output (-) - terminal 1 X2 |
|
• |
Right rear surround speaker
output (+) - terminal 16 X2 |
|
• |
Right rear surround speaker
output (-) - terminal 15 X2 |
|
• |
Left rear subwoofer speaker
output (+) - terminal 6 X1 |
|
• |
Left rear subwoofer speaker
output (-) - terminal 2 X1 |
|
• |
Right rear subwoofer speaker
output (+) - terminal 7 X1 |
|
• |
Right rear subwoofer speaker
output (-) - terminal 3 X1 |
⇒ |
If greater than the specified range, test both
circuits of the affected speaker for a short to voltage. |
3. |
Radio ON, test for infinite
resistance between the appropriate signal circuit terminal listed
below and ground: |
|
• |
Left front speaker output (+)
- terminal 8 X2 |
|
• |
Left front speaker output (-)
- terminal 7 X2 |
|
• |
Right front speaker output (+)
- terminal 14 X2 |
|
• |
Right front speaker output (-)
- terminal 13 X2 |
|
• |
Front center speaker output
(+) - terminal 4 X2 |
|
• |
Front center speaker output
(-) - terminal 3 X2 |
|
• |
Left rear surround speaker
output (+) - terminal 2 X2 |
|
• |
Left rear surround speaker
output (-) - terminal 1 X2 |
|
• |
Right rear surround speaker
output (+) - terminal 16 X2 |
|
• |
Right rear surround speaker
output (-) - terminal 15 X2 |
|
• |
Left rear subwoofer speaker
output (+) - terminal 6 X1 |
|
• |
Left rear subwoofer speaker
output (-) - terminal 2 X1 |
|
• |
Right rear subwoofer speaker
output (+) - terminal 7 X1 |
|
• |
Right rear subwoofer speaker
output (-) - terminal 3 X1 |
⇒ |
If less than the specified value, test both
circuits of the affected speaker for a short to ground. |
4. |
If all circuits test normal,
reconnect all harness connectors at the amplifier. |
5. |
Ignition ON, radio ON,
disconnect the appropriate speaker. |
6. |
Test for 4-8 V between the
signal circuit terminals and ground. |
⇒ |
If less then the specified range, test the circuit
for an open/high resistance. If the circuit tests normal, replace
the amplifier. |
⇒ |
If greater then the specified range, test the
circuit for a short to voltage. If the circuit tests normal,
replace the amplifier. |
7. |
If the circuit tests normal,
replace the speaker. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|