Speaker Malfunction
| Speaker Malfunction |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Amplifier B+
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-
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1
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-
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-
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Left Front Low Level Audio Control
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B1025 02,
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B1025 04,
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B1025 01,
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-
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Right Front Low Level Audio Control
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B1035 02,
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B1035 04,
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B1035 01,
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-
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Left Rear Low Level Audio Control
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B1045 02,
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B1045 04,
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B1045 01,
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-
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Right Rear Low Level Audio Control
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B1055 02
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B1055 04
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B1055 01,
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-
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Subwoofer Low Level Audio Control
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2
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2
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2
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-
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Center Low Level Audio Control
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3
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3
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3
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-
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Amplifier Ground
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-
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1
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-
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-
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1. Amplifier inoperative/no sound from subwoofers.
2. No or reduced sound from subwoofer. 3. No sound from center speaker. |
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| 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 DMM, each audio channel circuit will measure approx. 6.5 V DC. The sound generated by the system is produced by a varying alternating current (AC) which is centered around the DC current bias 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 1 V AC and less, where constant music may measure 3 V AC and slightly higher. The amplifier can not set DTCs.
| Diagnostic Aids |
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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.
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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.
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The amplifier control circuit has less than 1 V when the mute function is OFF, and will have 4-6 V DC when at full mute.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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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.
| Circuit/System Testing |
| Note | ||
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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 T3 Audio Amplifier.
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| 2. |
Ignition OFF, test for less than 10 Ω between the ground circuit terminal 4 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, test for B+ between the B+ circuit terminal 8 and ground.
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| 5. |
If less than specified value, test the circuit for a short to ground, or an open/high resistance.
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| 6. |
Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
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| 7. |
Radio ON, test for B+ between the signal circuit terminal 13 and ground.
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| 8. |
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 A11 Radio.
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| 9. |
Radio ON, test for less than 1 V between the amplifier control circuit terminal 6 and ground.
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| 10. |
If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
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| 11. |
If all circuits test normal, replace the T3 Audio Amplifier.
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Amplifier Circuit Malfunction - UQS
| 1. |
Ignition OFF, disconnect the X1 harness connector at the T3 Audio Amplifier.
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| 2. |
Ignition OFF, test for less than 10 Ω between the ground circuit terminal 8 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.
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| 5. |
If less than specified value, test the circuit for a short to ground, or an open/high resistance.
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| 6. |
Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
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| 7. |
Radio ON, test for B+ between the signal circuit terminal 13 and ground.
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| 8. |
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 A11 Radio.
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| 9. |
Radio muted, test for 6-8 V between the amplifier control circuit terminal 6 and ground.
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| 10. |
If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
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| 11. |
If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
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| 12. |
If all circuits test normal, replace the T3 Audio Amplifier.
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Speaker Malfunction Radio Output Testing - UQA
| 1. |
Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
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| 2. |
Radio ON, test for 4-8 V between the signal circuit terminal listed below and ground.
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Left front low level audio control (+) terminal 9 X3
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Left front low level audio control (-) terminal 1 X3
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Right front low level audio control (+) terminal 10 X3
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Right front low level audio control (-) terminal 2 X3
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Left rear low level audio control (+) terminal 11 X3
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Left rear low level audio control (-)- terminal 3 X3
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Right rear low level audio control (+) terminal 12 X3
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Right rear low level audio control (-) terminal 4 X3
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| 3. |
If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
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| 4. |
If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
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| 5. |
If all circuits test normal, replace the T3 Audio Amplifier.
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Speaker Malfunction Radio Output Testing - UQS
| 1. |
Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
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| 2. |
Radio ON, test for 1-8 V between the signal circuit terminal listed below and ground.
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Left front low level audio control (+) terminal 9 X3
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Left front low level audio control (-) terminal 1 X3
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Right front low level audio control (+) terminal 10 X3
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Right front low level audio control (-) terminal 2 X3
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Left rear low level audio control (+) terminal 11 X3
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Left rear low level audio control (-)- terminal 3 X3
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Right rear low level audio control (+) terminal 12 X3
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Right rear low level audio control (-) terminal 4 X3
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Center low level audio control (+) terminal 7 X3
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Center low level audio control (-) terminal 15 X3
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Subwoofer low level audio control (+) terminal 8 X3
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Subwoofer low level audio control (-) terminal 16 X3
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| 3. |
If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
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| 4. |
If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
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| 5. |
If all circuits test normal, replace the T3 Audio Amplifier.
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Speaker Malfunction Amplifier Output Testing - UQA
| 1. |
Ignition OFF, disconnect the X1 and X2 connectors at the T3 Audio Amplifier.
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| 2. |
Radio ON, test for less than 1 V between the signal circuit terminal listed below and ground:
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Left front speaker output (+) terminal 10 X2
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Left front speaker output (-) terminal 2 X2
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Right front speaker output (+) terminal 11 X2
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Right front speaker output (-) terminal 3 X2
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Left rear speaker output (+) terminal 12 X2
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Left rear speaker output (-) terminal 4 X2
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Right rear speaker output (+) terminal 13 X2
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Right rear speaker output (-)- terminal 5 X2
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Front center speaker output (+) terminal 14 X2
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Front center speaker output (-) terminal 6 X2
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Rear subwoofer speaker output (+) terminal 6 X1
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Rear subwoofer speaker output (-) terminal 2 X1
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Rear subwoofer speaker output (+) terminal 7 X1
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Rear subwoofer speaker output (-) terminal 3 X1
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| 3. |
If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
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| 4. |
Radio ON, test for infinite resistance between the signal circuit terminal listed below and ground:
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Left front speaker output (+) terminal 10 X2
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Left front speaker output (-) terminal 2 X2
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Right front speaker output (+) terminal 11 X2
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Right front speaker output (-) terminal 3 X2
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Left rear speaker output (+) terminal 12 X2
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Left rear speaker output (-) terminal 4 X2
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Right rear speaker output (+) terminal 13 X2
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Right rear speaker output (-)- terminal 5 X2
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Front center speaker output (+) terminal 14 X2
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Front center speaker output (-) terminal 6 X2
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Rear subwoofer speaker output (+) terminal 6 X1
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Rear subwoofer speaker output (-) terminal 2 X1
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Rear subwoofer speaker output (+) terminal 7 X1
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Rear subwoofer speaker output (-) terminal 3 X1
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| 5. |
If less than the specified value, test both circuits of the affected speaker for a short to ground.
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| 6. |
If all circuits test normal, reconnect all harness connectors at the T3 Audio Amplifier.
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| 7. |
Ignition ON, radio ON, disconnect the speaker.
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| 8. |
Test for 4-8 V between the signal circuit terminals and ground.
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| 9. |
If less than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the T3 Audio Amplifier.
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| 10. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the T3 Audio Amplifier.
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| 11. |
If the circuit tests normal, replace the speaker.
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Speaker Malfunction Amplifier Output Testing - UQS
| 1. |
Ignition OFF, disconnect the X1 and X2 connectors at the T3 Audio Amplifier.
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| 2. |
Radio ON, test for less than 1 V between the signal circuit terminal listed below and ground:
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Left front speaker output (+) terminal 10 X2
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Left front speaker output (-) terminal 2 X2
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Right front speaker output (+) terminal 11 X2
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Right front speaker output (-) terminal 3 X2
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Left rear speaker output (+) terminal 4 X2
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Left rear speaker output (-) terminal 12 X2
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Right rear speaker output (+) terminal 5 X2
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Right rear speaker output (-) terminal 13 X2
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Front center speaker output (+) terminal 14 X2
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Front center speaker output (-) terminal 6 X2
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Rear subwoofer speaker output (+) terminal 3 X1
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Rear subwoofer speaker output (-) terminal 7 X1
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Rear subwoofer speaker output (+) terminal 2 X1
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Rear subwoofer speaker output (-) terminal 6 X1
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Left surround speaker output (+) terminal 15 X2
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Right surround speaker output (-) terminal 7 X2
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| 3. |
If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
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| 4. |
Radio ON, test for infinite resistance between the signal circuit terminal listed below and ground:
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Left front speaker output (+) terminal 10 X2
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Left front speaker output (-) terminal 2 X2
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Right front speaker output (+) terminal 11 X2
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Right front speaker output (-) terminal 3 X2
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Left rear speaker output (+) terminal 4 X2
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Left rear speaker output (-) terminal 12 X2
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Right rear speaker output (+) terminal 5 X2
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Right rear speaker output (-) terminal 13 X2
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Front center speaker output (+) terminal 14 X2
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Front center speaker output (-) terminal 6 X2
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Rear subwoofer speaker output (+) terminal 3 X1
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Rear subwoofer speaker output (-) terminal 7 X1
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Rear subwoofer speaker output (+) terminal 2 X1
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Rear subwoofer speaker output (-) terminal 6 X1
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Left surround speaker output (+) terminal 15 X2
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Right surround speaker output (-) terminal 7 X2
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| 5. |
If less than the specified value, test both circuits of the affected speaker for a short to ground.
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| 6. |
If all circuits test normal, reconnect all harness connectors at the T3 Audio Amplifier.
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| 7. |
Ignition OFF, disconnect the speaker.
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| 8. |
Radio ON, test for 4-8 V between the signal circuit terminals and ground.
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| 9. |
If less than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the T3 Audio Amplifier.
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| 10. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the T3 Audio Amplifier.
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| 11. |
If the circuit tests normal, replace the speaker.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Speaker Replacement Reference
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Control Module References
for amplifier or radio replacement
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