B1055
DTC B1025-B1095
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1025 01
- Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02
- Audio Output 1 Left Front Circuit Short to Ground
DTC B1025 04
- Audio Output 1 Left Front Circuit Open
DTC B1035 01
- Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02
- Audio Output 2 Right Front Circuit Short to Ground
DTC B1035 04
- Audio Output 2 Right Front Circuit Open
DTC B1045 01
- Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02
- Audio Output 3 Left Rear Circuit Short to Ground
DTC B1045 04
- Audio Output 3 Left Rear Circuit Open
DTC B1055 01
- Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02
- Audio Output 4 Right Rear Circuit Short to Ground
DTC B1055 04
- Audio Output 4 Right Rear Circuit Open
DTC B1065 01
- Audio Output 5 Circuit Short to Battery (Center IP)
DTC B1065 02
- Audio Output 5 Circuit Short to Ground (Center IP)
DTC B1065 04
- Audio Output 5 Circuit Open (Center IP)
DTC B1075 01
- Audio Output 6 Circuit Short to Battery (Subwoofer)
DTC B1075 02
- Audio Output 6 Circuit Short to Ground (Subwoofer)
DTC B1075 04
- Audio Output 6 Circuit Open (Subwoofer)
DTC B1085 01
- Audio Output 7 Circuit Short to Battery (LR D-Pillar)
DTC B1085 02
- Audio Output 7 Circuit Short to Ground (LR D-Pillar)
DTC B1085 04
- Audio Output 7 Circuit Open (LR D-Pillar)
DTC B1095 01
- Audio Output 8 Circuit Short to Battery (RR D-Pillar)
DTC B1095 02
- Audio Output 8 Circuit Short to Ground (RR D-Pillar)
DTC B1095 04
- Audio Output 8 Circuit Open (RR D-Pillar)
Diagnostic Fault Information
Circuit/System Description
The up-level radio (UQA) supplies 4 channels of audio to an amplifier. The amplifier supplies 6 input signal channels to 8 speakers.
Conditions for Running the DTC
The radio is ON.
Conditions for Setting the DTC
The radio sets a current status for this DTC when a short to ground, short to voltage or an open is detected on any of the 6 speaker channel outputs from the radio.
Action Taken When the DTC Sets
No sound is present from one or more of the speakers.
Conditions for Clearing the DTC
The fault condition is not present for 0.25 second.
Diagnostic Aids
Speakers located in the front A-pillar are connected to the same channel as the speaker in the door. A DTC will only set after the amplifier only on up-level radios.
Circuit/System Verification
All speakers should function properly and the DTC does not reset.
Circuit/System Testing
Important: The DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose suspect audio input circuits to the speakers or the amplifier (if equipped). Diagnose audio input signals to the speakers from the amplifier if the DTC was set by the amplifier.
DTC Set In Amplifier
1. With the scan tool, verify the DTC is set by the amplifier.
2. Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the speaker terminals.
• If not within the specified range specified range replace the suspect speaker.
3. Disconnect the suspect audio amplifier harness connector.
4. Test for less than 1 volt on both of the suspect speaker output circuits.
• If greater than 1 volt repair short to voltage.
5. Test for infinite resistance between both of the suspect speaker output circuits and ground.
• If resistance is less than specified value, repair short to ground.
6. Test for less than 1 ohm between suspect speaker output circuits amplifier harness connector and the suspect speaker harness connector.
• If greater than specified value repair open or high resistance.
• If all circuits test normal, replace the amplifier.
DTC Set In Radio With Amplifier
1. With the scan tool, verify the DTC is set by the radio.
2. Disconnect the suspect audio amplifier harness connector.
3. Disconnect the radio harness connector.
4. Test for less than 1 volt on both of the suspect low level audio signal circuits.
• If greater than 1 volt repair short to voltage.
5. Test for infinite resistance between both low level audio signal circuits and ground.
• If less than specified value, repair short to ground.
6. Test for less than 1 ohm between the suspect low level audio signal circuits amplifier harness connector and the suspect speaker harness connector.
• If greater than specified value repair open or high resistance.
• If all circuits test normal, replace the amplifier.
DTC Set In Radio Without Amplifier
1. With the scan tool, verify the DTC is set by the radio.
2. Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the suspect speaker terminals.
• If not within the specified range specified range replace the suspect speaker.
3. Disconnect the suspect radio harness connector.
4. Test for less than 1 volt on both of the low level audio signal circuits.
• If greater than 1 volt repair short to voltage.
5. Test for infinite resistance between both of the suspect low level audio signal circuits and ground.
• If resistance is less than specified value, repair short to ground.
6. Test for less than 1 ohm between the suspect speaker harness connector both low level audio signal circuits and the suspect radio harness connector.
• If greater than specified value repair open or high resistance.
• If all circuits test normal, replace the radio.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Speaker Replacement Reference
* Programming and Relearning for Amplifier and Radio setup, and programming. Programming and Relearning