SAAB WIS ONLINE

DTC B1025, B1035, B1045, or B1055

DTC B1025, B1035, B1045, or B1055

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

Left Front Audio Output Circuit Short to Battery

DTC B1025 02

Left Front Audio Output Circuit Short to Ground

DTC B1025 04

Left Front Audio Output Circuit Open

DTC B1035 01

Front Audio Output Circuit Short to Battery

DTC B1035 02

Right Front Audio Output Circuit Short to Ground

DTC B1035 04

Right Front Audio Output Circuit Open

DTC B1045 01

Left Rear Audio Output Circuit Short to Battery

DTC B1045 02

Left Rear Audio Output Circuit Short to Ground

DTC B1045 04

Left Rear Audio Output Circuit Open

DTC B1055 01

Right Rear Audio Output Circuit Short to Battery

DTC B1055 02

Right Rear Audio Output Circuit Short to Ground

DTC B1055 04

Right Rear Audio Output Circuit Open

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Left Front Audio Signal B1025 02* B1025 04* B1025 01* -
Right Front Audio Signal B1035 02* B1035 04* B1035 01* -
Left Rear Audio Signal B1045 02* B1045 04* B1045 01* -
Right Rear Audio Signal B1055 02* B1055 04* B1055 01* -
* Reduced or no sound from speakers


Circuit/System Description

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

Diagnostic help

Incorrect speaker installation or loose trim can cause audible buzzing or distortion.

Inspect relevant speaker and surrounding trim. Faults in fit and installation must be remedied.

Conditions for Running the DTC


• Ignition in ON or ACC position.

• The system voltage is 9 - 16 V.

• The test is run once under radio Wake Up.


Conditions for Setting the DTC

B1025 01, B1035 01, B1045 01, B1055 01

The radio detects a short to voltage on the specified audio (+) or (-) circuit.

B1025 02, B1035 02, B1045 02, B1055 02

The radio detects a short to ground on the specified audio (+) or (-) circuit.

B1025 04, B1035 04, B1045 04, B1055 04

The radio detects an open on the specified audio (+) or (-) circuit.

Action Taken When the DTC Sets

The radio continues to send the output signal to the speaker signal circuit with the current fault.

Conditions for Clearing the DTC


• 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.

• A history DTC clears after 50 malfunction-free ignition cycles.


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


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Radio ON, Mute OFF, adjust the fade and balance controls on the radio to test all channels individually. Each channel should produce clear and even sound.

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the appropriate P19 speaker.

2. Radio ON, test for 5.0-7.5 V between the signal circuit terminal 1 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 5.0-7.5 V between the signal circuit terminal 2 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 appropriate P19 speaker.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Speaker Replacement Reference

• Control Module References for radio replacement, setup, and programming