B1055:02 Code - Right Rear Door Audio Output 4 Circuit Short to Ground
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 Right Rear Door Speaker. 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
- B1055:02 indicates Right Rear Door Audio Output 4 Circuit Short to Ground.
- Common causes
- Common causes include Faulty Radio Unit, Faulty Audio Amplifier (If equipped), Faulty Right Rear Door Speaker.
- 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 B1055:02 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 ground is detected on the specified (+) (positive) or (−) (negative) signal circuit.
What are the Possible Causes of the DTC B1055:02?
- Faulty Radio Unit
- Faulty Audio Amplifier (If equipped)
- Faulty Right Rear Door Speaker
- Right Rear Door Speaker harness is open or shorted
- Right Rear Door Speaker circuit poor electrical connection
How to Fix the DTC B1055:02?
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
B1055:02 Right Rear Door Audio Output 4 Circuit Short to Ground
B1055:04 Right Rear Door Audio Output 4 Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1055:02 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 B1055:02 Code
1. What are common symptoms of OBDII code B1055:02?
- Common symptoms include a malfunctioning right rear door audio system, no sound coming from the speaker, or distorted audio output.
2. What can cause the OBDII code B1055:02 to trigger?
- This code is usually triggered by a short circuit between the audio output circuit in the right rear door and the ground, leading to a loss of signal.
3. How can I diagnose the root cause of the B1055:02 code?
- To diagnose the issue, you can perform a visual inspection of the wiring harness, check for damaged wires or loose connections, and use a multimeter to test for continuity and shorts.
4. Is it safe to continue driving with the B1055:02 trouble code?
- It is generally safe to continue driving, but you may experience audio issues in the affected right rear door, such as no sound or poor sound quality.
5. How can I repair the Right Rear Door Audio Output 4 Circuit Short to Ground issue?
- The repair process typically involves locating the short circuit, repairing or replacing damaged wiring, and ensuring proper connections are made to resolve the grounding issue.
6. Can a DIY enthusiast fix the B1055:02 trouble code at home?
- Depending on your experience with automotive electrical systems, you may be able to diagnose and repair the issue at home. However, professional assistance may be needed for complex wiring problems.
7. Will resetting the OBDII code B1055:02 make the issue go away?
- Resetting the code may temporarily clear the error, but if the underlying issue causing the short to ground is not fixed, the code is likely to reappear.
8. Are there any preventive measures to avoid triggering the B1055:02 code?
- Regularly inspecting and maintaining the audio system wiring in all vehicle doors can help prevent issues like circuit shorts to ground that lead to this trouble code.
9. Could extreme weather conditions contribute to the B1055:02 trouble code?
- Extreme temperatures or moisture intrusion can potentially damage wiring harnesses and lead to shorts, so it is important to protect the vehicle's electrical components from environmental factors.
10. How long does it typically take to repair the Right Rear Door Audio Output 4 Circuit Short to Ground issue?
- The repair time can vary depending on the extent of the wiring damage and the accessibility of the affected components, but it can usually be resolved within a few hours to a day by a skilled technician.
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