B1055 Cadillac Code - Right Rear Door Audio Output 4 Circuit
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 Cadillac indicates Right Rear Door Audio Output 4 Circuit.
- 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 Cadillac 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.
What are the Possible Causes of the DTC B1055 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does the OBDII code B1055 on a Cadillac mean?
B1055 indicates an issue with the Right Rear Door Audio Output 4 Circuit, which is part of the audio system responsible for delivering sound to the right rear door speaker.
2. What are common symptoms of the B1055 code in a Cadillac?
Common symptoms include no sound or distorted sound from the right rear door speaker, intermittent audio issues, or a fault warning from the vehicle's audio or infotainment system.
3. What causes the B1055 code to appear?
This code can be caused by a faulty right rear door speaker, damaged wiring or connectors in the audio circuit, or a malfunctioning amplifier or audio control module.
4. How do I diagnose the B1055 code on my Cadillac?
Start by inspecting the right rear door speaker, checking for loose or damaged wiring, and testing the continuity of the audio circuit. If no issues are found, test the amplifier or audio control module for faults.
5. Can a blown speaker trigger the B1055 code?
Yes, a blown or damaged speaker in the right rear door can disrupt the circuit and trigger the B1055 code.
6. Is the B1055 code specific to Cadillacs?
While the B1055 code may appear in other GM vehicles, the "Right Rear Door Audio Output 4 Circuit" designation is specific to the Cadillac's audio system design.
7. How do I fix the B1055 code on my Cadillac?
Repairs may include replacing the right rear door speaker, repairing or replacing damaged wiring or connectors, or replacing a faulty amplifier or audio control module.
8. Can I continue driving with the B1055 code active?
Yes, the B1055 code typically doesn’t affect vehicle operation, but the right rear door speaker may not function correctly, impacting audio quality.
9. How much does it cost to repair the B1055 code in a Cadillac?
Repair costs depend on the cause. Speaker replacement typically costs $50–$200, while amplifier or module replacement can range from $300–$1,000.
10. Do I need a professional to fix the B1055 code?
If you're comfortable with basic electrical diagnostics and repairs, you may be able to fix wiring or replace a speaker yourself. For amplifier or module issues, professional assistance is recommended.
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