B1045:02 Code - Left Rear Door Audio Output 3 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 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
- B1045:02 indicates Left Rear Door Audio Output 3 Circuit Short to Ground.
- 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 B1045:02 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 B1045:02?
- 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 B1045:02?
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
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 B1045:02 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 B1045:02 Code
What does the OBDII code B1045:02 mean?
Code B1045:02 indicates a short-to-ground condition in the Left Rear Door Audio Output 3 Circuit, which is part of the vehicle's audio system.
What are the symptoms of code B1045:02?
Common symptoms include no sound or distorted sound from the left rear door speaker and potential audio system malfunctions.
What causes the B1045:02 code to appear?
This code is typically caused by damaged wiring, a faulty speaker, or a short circuit in the audio system for the left rear door.
Can I still drive my car with the B1045:02 code active?
Yes, you can still drive the vehicle, but the audio system may not function correctly, and it is recommended to address the issue to avoid further damage.
How do I diagnose the B1045:02 code?
Start by inspecting the wiring and connectors for the left rear door speaker, then test the speaker itself and check for any visible damage or short circuits.
What tools are needed to fix the B1045:02 code?
You may need a multimeter to check for shorts, a wiring diagram for the audio system, and basic tools to access and inspect the speaker and connections.
Can a blown speaker cause the B1045:02 code?
Yes, a blown or internally damaged speaker can create a short-to-ground condition, triggering this code.
How do I fix the B1045:02 code?
Repairs may include replacing the left rear door speaker, repairing damaged wiring, or addressing any short circuits in the audio system.
Will clearing the code fix the problem permanently?
No, clearing the code will not resolve the underlying issue. You must address the root cause, such as repairing wiring or replacing components.
Is the B1045:02 code common in all vehicles?
No, this code is specific to certain vehicle makes and models, so its occurrence depends on the design of the vehicle's audio system.
Discuss the causes and fixes for B1045:02 OBDII Code
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