DTC B1025, B1035, B1045, or B1055 |
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. |
DTC Descriptors |
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Amplifier B+ |
-- |
1 |
- |
- |
Left Front Low Level Audio Signal |
B1025 02, * |
B1025 04, * |
B1025 01, * |
- |
Right Front Low Level Audio Signal |
B1035 02, * |
B1035 04, * |
B1035 01, * |
- |
Left Rear Low Level Audio Signal |
B1045 02, * |
B1045 04, * |
B1045 01, * |
- |
Right Rear Low Level Audio Signal |
B1055 02* |
B1055 04* |
B1055 01, * |
- |
Subwoofer Low Level Audio Signal |
2 |
2 |
2 |
- |
Center Low Level Audio Signal |
3 |
3 |
3 |
- |
Amplifier Ground |
- |
1 |
- |
- |
1. Amplifier inoperative/no sound from subwoofers. 2. No or reduced sound from subwoofer. 3. No sound from center speaker. * Noticeable audio distortion possible. |
Circuit/System Description |
Conditions for Running the DTC |
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The ignition is in the RUN or ACCESSORY position. |
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The system voltage is between 9.5-15.5 V. |
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All the above conditions are present for greater than 10 s. |
Conditions for Setting the DTC |
Action Taken When the DTC Sets |
Conditions for Clearing the DTC |
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A current DTC clears when the conditions for setting the DTC are no longer present and the ignition has been cycled from OFF to ON. |
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A history DTC clears after 50 malfunction-free ignition cycles. |
Reference Information |
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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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Circuit/System Verification |
Circuit/System 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. |
3. |
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 A11 Radio. |
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. |
5. |
Test for 4-8 V between the signal circuit terminal B and ground. |
6. |
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 A11 Radio. |
7. |
If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio. |
8. |
If all circuits test normal, replace the speaker. |
1. |
Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier. |
2. |
Radio ON, test for 4-8 V between the appropriate signal circuit terminal listed below and ground. |
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Left front low level audio signal (+) terminal 9 X3 |
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Left front low level audio signal (-) terminal 1 X3 |
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Right front low level audio signal (+) terminal 10 X3 |
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Right front low level audio signal (-) terminal 2 X3 |
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Left rear low level audio signal (+) terminal 11 X3 |
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Left rear low level audio signal (-) terminal 3 X3 |
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Right rear low level audio signal (+) terminal 12 X3 |
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Right rear low level audio signal (-) terminal 4 X3 |
3. |
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 A11 Radio. |
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. |
5. |
If all circuits test normal, replace the T3 Audio Amplifier. |
Repair Instructions |
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Speaker Replacement Reference
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Control Module References for radio and amplifier replacement, setup and programming |