DTC Descriptor

DTC B1025 00: Audio Output 1 Left Front Circuit Short to Battery

DTC B1027 02: Audio Output 1 Left Front Circuit Short to Ground

DTC B1028 01: Audio Output 1 Left Front Circuit Short to Battery

DTC B1029 04: Audio Output 1 Left Front Circuit Open

DTC B1035 00: Audio Output 2 Right Front Circuit Shorted

DTC B1037 02: Audio Output 2 Right Front Circuit Short to Ground

DTC B1038 01: Audio Output 2 Right Front Circuit Short to Battery

DTC B1039 04: Audio Output 2 Right Front Circuit Open

DTC B1045 00: Audio Output 3 Left Rear Circuit Shorted

DTC B1047 02: Audio Output 3 Left Rear Circuit Short to Ground

DTC B1048 01: Audio Output 3 Left Rear Circuit Short to Battery

DTC B1049 00: Audio Output 3 Left Rear Circuit Open

DTC B1055 00: Audio Output 4 Right Rear Circuit Shorted

DTC B1057 02: Audio Output 4 Right Rear Circuit Short to Ground

DTC B1058 01: Audio Output 4 Right Rear Circuit Short to Battery

DTC B1059 00: Audio Output 4 Right Rear Circuit Open

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle.

Circuit/System Description

These DTCs are only active for the Base and High level infotainment systems.

The infotainment unit provides four discrete channels to the speakers. Each channel consists of two wires that connect to a speaker. During normal operation, the infotainment unit applies approximately 5-6 volts to the plus (+) and minus (-) terminals at the speaker. The terminals attach to the speaker voice coil.

In order for the speaker to produce sound, the amplifier in the infotainment unit will raise the voltage on one terminal and lower the voltage on the opposite terminal, then quickly reverse the polarity. The constant switching of the electrical signal causes the voice coil and speaker cone to move rapidly in two directions. The movement of the speaker cone produces sound.

The High level infotainment system supplies 2 channels of audio to a subwoofer amplifier. The subwoofer amplifier supplies 2 signal channels to 2 subwoofer speakers.

Conditions for Running the DTC

Conditions for Setting the DTC

The infotainment unit sets a current status for this DTC when a short to ground, short to voltage or an open/high resistance is detected on any of the 4 speaker channel outputs from the infotainment unit.

Action Taken When the DTC Sets

The infotainment unit disables the audio output to the speaker with the current fault, producing no sound from the speaker.

Conditions for Clearing the DTC

Diagnostic Aids

With the use of Co-axial speakers, some sound (Bass or Treble) may be coming from the speakers depending on what circuit has been affected. Adjusting the bass and treble accordingly to identify a faulty circuit may help with diagnosis. The High level subwoofer amplifier is supplied by the same channels that supply the left/right rear door speakers.

Reference Information

Schematic Reference

Radio/Audio System Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References

Circuit/System Verification

Verify customer complaint by adjusting speaker outputs through the infotainment fascia controls, fade and/or balance.

Circuit/System Testing

Note: It is recommended that Component Testing is performed before Circuit Testing when diagnosing speaker channels.

1. Using the scan tool, select the DTC display function. Verify that an audio output DTC is set.
2. If the DTC is set, test the suspect speaker input circuit for a short to ground, short to voltage or an open/high resistance.

⇒	If all circuits test normal, replace the infotainment unit.

3. Test the suspect low level audio signal circuit from the infotainment unit to the speakers or amplifier (if equipped) for a short to ground, short to voltage or an open/high resistance.

⇒	If all circuits test normal, replace the infotainment unit.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification.

Control Module References.