For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | 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 B1035 01: Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground
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 B1055 01: Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02: Audio Output 4 Right Rear Circuit Short to Ground
DTC B1065 01: Audio Output 5 Circuit Short to Battery (Center I/P)
DTC B1065 0: Audio Output 5 Circuit Short to Ground (Center I/P)
DTC B1075 01: Audio Output 6 Circuit Short to Battery (Subwoofer)
DTC B1075 02: Audio Output 6 Circuit Short to Ground (Subwoofer)

Circuit | Short to Ground | Short to Voltage
Left Front Speaker Signal Circuits | B1025 02 | B1025 01
Right Front Speaker Signal Circuits | B1035 02 | B1035 01
Left Rear Speaker Signal Circuits | B1045 02 | B1045 01
Right Rear Speaker Signal Circuits | B1055 02 | B1055 01
Front Center Speaker Signal Circuits | B1065 02 | B1065 01
Subwoofer Speaker Signal Circuits | B1075 02 | B1075 01

### Circuit/System Description

The navigation radio supplies 6 channels of audio signals to an amplifier. The amplifier supplies 15 output signal channels to 15 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 battery is detected on any of the audio output circuits from the navigation 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 seconds.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Entertainment/Communication Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### Circuit/System Testing

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

1. With the scan tool, first verify the DTC is set by the amplifier.

If the DTC was set by the amplifier, test the suspect speaker circuit for a short to ground or short to power.

If all circuits test normal, replace the amplifier.

2. Test the radio audio output circuit for a short to ground or short to power.

If all circuits test normal, replace the navigation radio

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | For the speaker replacement, refer to Speaker Replacement Reference.

• | For audio amplifier and navigation radio replacement, setup and programming, refer to Control Module References.