B1045:01 Code - Left Rear Door Audio Output 3 Circuit Short to Battery
Quick Answer
Vehicles without Amplifier: Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one-half of battery voltage. Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier). Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- B1045:01 indicates Left Rear Door Audio Output 3 Circuit Short to Battery.
- Common causes
- Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier).
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code B1045:01 Description
Each of the audio output channel circuits (+) and (-), at the radio 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.
Vehicles with Amplifier:
The Media Oriented Systems Transport (MOST) is a high-speed multimedia network technology. The serial MOST bus uses a ring topology and synchronous data communication to transmit audio, video, data and control information between any devices attached.
The audio amplifier is a participant on the MOST network. The audio amplifier receives audio input and control information from the MOST bus.
Each of the audio output channel circuits (+) and (−), at the audio amplifier have a DC bias voltage that is approximately one-half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V 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 Diagnostic Trouble Code (DTC) will be set when a short to voltage (battery) is detected on the specified (+) (positive) or (−) (negative) signal circuit.
What are the Possible Causes of the DTC B1045:01?
- Faulty Radio Unit
- Faulty Audio Amplifier (If equipped)
- Faulty Left Rear Door Speaker (Subwoofer for vehicles with Amplifier)
- Left Rear Door Speaker (Subwoofer for vehicles with Amplifier) harness is open or shorted
- Left Rear Door Speaker (Subwoofer for vehicles with Amplifier) circuit poor electrical connection
How to Fix the DTC B1045:01?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B1045:02 Left Rear Door Audio Output 3 Circuit Short to Ground
B1045:04 Left Rear Door Audio Output 3 Circuit Open
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1045:01 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about B1045:01 Code
1. What does OBDII code B1045:01 mean?
Code B1045:01 indicates that the left rear door audio output 3 circuit has a short to battery, meaning there is an electrical issue where the circuit is receiving power when it shouldn't.
2. What are the common symptoms of code B1045:01?
Symptoms may include distorted or no audio from the left rear door speaker, intermittent sound issues, or unusual noises like popping or crackling from the speaker.
3. What causes OBDII code B1045:01?
This code is commonly caused by damaged or frayed wiring, a short circuit, a faulty speaker, or issues with the audio amplifier or control module.
4. Can I still drive my car with code B1045:01?
Yes, you can still drive your car with this code, but the audio system may not function properly, and ignoring the issue could lead to further electrical damage.
5. How do I diagnose the cause of code B1045:01?
Begin by inspecting the wiring and connections to the left rear door speaker for damage or corrosion. If no issues are found, test the speaker and the audio amplifier for faults.
6. How can I fix code B1045:01?
Repairs may include replacing damaged wiring, repairing short circuits, replacing a faulty speaker, or addressing issues with the audio amplifier or related components.
7. Is this a common issue in vehicles with advanced audio systems?
Yes, vehicles with advanced or premium audio systems may experience this issue due to the complexity of the wiring and components involved.
8. Can a blown fuse cause code B1045:01?
A blown fuse is unlikely to cause this specific code, but it is worth checking the fuses related to the audio system to rule out other potential issues.
9. Do I need a professional to fix code B1045:01?
If you are comfortable diagnosing and repairing electrical issues, you may be able to fix it yourself. However, a professional may be needed for more complex problems or if specialized tools are required.
10. Will clearing the code fix the issue?
Clearing the code will not fix the underlying problem. The issue must be properly diagnosed and repaired to prevent the code from returning.
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