B1045 Code - Left Rear Door Audio Output 3 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 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 indicates Left Rear Door Audio Output 3 Circuit.
- 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 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 B1045?
- 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?
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 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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Information for Specific Makes
- B1045 Buick — Left Rear Door Audio Output 3 Circuit
- B1045 Cadillac — Left Rear Door Audio Output 3 Circuit
- B1045 Chevrolet — Left Rear Door Audio Output 3 Circuit
- B1045 GMC — Left Rear Door Audio Output 3 Circuit
- B1045 Infiniti — Diagnosis Sensor Unit
- B1045 Nissan — Diagnosis Sensor Unit
Frequently Asked Questions about B1045 Code
1. What are the common symptoms of OBDII code B1045 - Left Rear Door Audio Output 3 Circuit?
- Common symptoms include no sound from the left rear door speaker, distorted audio, or complete audio failure in the vehicle.
2. What are the possible causes of OBDII code B1045?
- The code B1045 may be caused by a faulty speaker, damaged wiring, loose connections, or a malfunctioning audio amplifier in the left rear door.
3. How can I diagnose the issue related to OBDII code B1045?
- You can diagnose the issue by checking the connections, inspecting the wiring harness, testing the speaker, and using a multimeter to check for continuity and proper voltage.
4. Can I repair OBDII code B1045 at home?
- Depending on your skills and tools, you may be able to repair the issue at home by fixing the wiring, replacing the speaker, or repairing the connections. However, professional help may be required in some cases.
5. Is it safe to continue driving with OBDII code B1045 present?
- While the code itself does not pose a safety risk, driving with audio output issues can be distracting and reduce the overall driving experience. It is recommended to address the issue promptly.
6. How much does it typically cost to repair OBDII code B1045?
- The cost of repair can vary depending on the root cause of the issue. Simple fixes like reconnecting loose wires may be inexpensive, while replacing a faulty audio component or wiring harness can be more costly.
7. Can OBDII code B1045 affect other electrical systems in the vehicle?
- While the code specifically relates to the left rear door audio output, electrical issues in one part of the vehicle can sometimes affect other systems. It's advisable to address the problem to prevent potential complications.
8. Will resetting the OBDII code B1045 make the issue go away permanently?
- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the audio output issue. It's essential to diagnose and repair the root cause for a permanent solution.
9. Are there any preventive measures to avoid OBDII code B1045 in the future?
- Regularly checking and maintaining the audio system components, avoiding water damage to the speakers and wiring, and ensuring proper installation of aftermarket audio equipment can help prevent code B1045.
10. How long does it take to repair OBDII code B1045?
- The repair time can vary based on the complexity of the issue and the extent of the repairs needed. Simple fixes may take a short time, while more extensive repairs could require several hours or even a day.
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