B1045
DTC B1025, B1035, B1045, or B1055
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide 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/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.
The base (no amplifier) speaker system on the convertible also includes a self-amplified subwoofer. The subwoofer receives audio input from the rear audio signal circuits. The subwoofer assembly receives power and ground from the vehicle harness. The radio controls the power state of the subwoofer via the remote enable circuit.
Conditions for Running the DTC
* The ignition is in the RUN or ACC position.
* The system voltage is at least 9.5 V and no more than 15.5 V.
* All the above conditions are present for greater than 10 seconds.
Conditions for Setting the DTC
B1025 01, B1035 01, B1045 01, B1055 01
The radio detects a short to voltage on the audio (+) or audio (-) circuit.
B1025 02, B1035 02, B1045 02, B1055 02
The radio detects a short to ground on the audio (+) or audio (-) circuit.
B1025 04, B1035 04, B1045 04, B1055 04
The radio detects an open on the audio (+) or audio (-) circuit.
Action Taken When the DTC Sets
The radio disables the audio output 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.
Diagnostic Aids
* Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.
* When equipped with an amplifier, the radio does not set DTCs for the audio outputs.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Radio/Audio System Description and Operation (with Monochrome Display) Radio/Audio System Description and Operation (with Monochrome Display)Radio/Audio System Description and Operation (with Color Display) Radio/Audio System Description and Operation (with Color Display)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, A11 radio ON, mute OFF.
2. Verify clear audio is heard from each speaker, adjusting fade and balance controls to test each speaker individually.
• If audio is inoperative from one or more speakers, or the audio emitted is not clear.
Refer to Circuit/System Testing.
• If clear audio is heard from all speakers.
3. All OK.
Circuit/System Testing
Note: Some circuits supply audio signals to more than one speaker. It may be necessary to disconnect all speakers on the affected audio circuit when performing circuit tests.
1. Ignition OFF, disconnect the harness connector at the appropriate speaker. Radio ON, mute OFF.
2. Test for 5-7 V between the signal circuit terminals listed below and ground:
* Door speaker, rear speaker or tweeter speaker audio signal (-) terminal 1
* Door speaker, rear speaker or tweeter speaker audio signal (+) terminal 2
* Subwoofer audio signal (-) terminals 1 and 9 (convertible with UQ3)
* Subwoofer audio signal (+) terminals 2 and 10 (convertible with UQ3)
• If less than 5 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 radio.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 radio.
• If greater than 7 V
1. Ignition OFF, disconnect the X1 harness connector at the A11 radio. Ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 radio.
• If between 5-7 V
3. Test or replace the P19 speaker.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Speaker Replacement Reference Speaker Replacement Reference
* Control Module References Control Module References for radio replacement, programming, and setup.