B1045

DTC B1025-B1125

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provide 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 B1085 01
- Audio Output 7 Circuit Short to Battery (LR Shelf)

DTC B1085 02
- Audio Output 7 Circuit Short to Ground (LR Shelf)

DTC B1085 04
- Audio Output 7 Circuit Open (LR Shelf)

DTC B1095 01
- Audio Output 8 Circuit Short to Battery (RR Shelf)

DTC B1095 02
- Audio Output 8 Circuit Short to Ground (RR Shelf)

DTC B1095 04
- Audio Output 8 Circuit Open (RR Shelf)

DTC B1105 01
- Audio Output 9 Circuit Short to Battery (LF IP)

DTC B1105 02
- Audio Output 9 Circuit Short to Ground (LF IP)

DTC B1105 04
- Audio Output 9 Circuit Open (LF IP)

DTC B1115 01
- Audio Output 10 Circuit Short to Battery (RF IP)

DTC B1115 02
- Audio Output 10 Circuit Short to Battery (RF IP)

DTC B1115 04
- Audio Output 10 Circuit Open (RF IP)




Diagnostic Fault Information






Circuit/System Description

The radio provides six discrete audio output channels to the amplifier. Each channel includes two wires consisting of a plus (+) and minus (-) circuit. During normal operation, the radio applies approximately 4 volts on the audio output circuit to the amplifier. The amplifier amplifies the input to ten discrete audio output channels connected to speakers.


In order for the speaker to produce sound, the amplifier raises the voltage on one speaker terminal and lowers the voltage on the opposite speaker 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.


Conditions for Running the DTC

The following are conditions that must be present in order for the amplifier to enable diagnostics:

* The ignition must be in the RUN or ACC position.
* The system voltage is at least 9.5 volts and no more than 15.5 volts.
* All the above conditions are present for greater than 10 seconds.



Conditions for Setting the DTC

* The amplifier tests the audio outputs for a fault in the power-off mode.
* The fault is present during amplifier power-up.



Action Taken When the DTC Sets

The amplifier disables the audio output to the speaker with the current fault. No audio is heard from the speaker.


Conditions for Clearing the DTC

* The conditions for setting the DTC are no longer present on the audio output circuit.
* A current DTC becomes history after an ignition cycle from OFF to ON.
* A history DTC clears after 50 malfunction-free ignition cycles.
* The amplifier receives the clear code command from the scan tool.



Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Verification

1. Clear the DTC with the scan tool.
2. Disconnect the battery for 30 seconds and then reconnect the battery.
3. Ignition ON, all speakers should function properly and the DTC does not reset.



Circuit/System Testing

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 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.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Speaker Replacement Reference (Speaker Replacement Reference)
* Control Module References (Programming and Relearning)for amplifier and radio replacement, setup, and programming