B1123 Nissan Code - Diagnosis Sensor Unit
Quick Answer
The Air Bag Diagnosis Sensor Unit detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air bag warning lamp in the combination meter. Common causes include Faulty Diagnosis Sensor Unit, Diagnosis Sensor Unit harness is open or shorted, Diagnosis Sensor Unit circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B1123 Nissan indicates Diagnosis Sensor Unit.
- Common causes
- Common causes include Faulty Diagnosis Sensor Unit, Diagnosis Sensor Unit harness is open or shorted, Diagnosis Sensor Unit circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B1123 Nissan Description
The Air Bag Diagnosis Sensor Unit contains the “G†sensors for both frontal and side collisions and spare battery function in case of main battery damaged in a collision.
What are the Possible Causes of the DTC B1123 Nissan?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1123 Nissan?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1123 Nissan 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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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
Frequently Asked Questions about B1123 Nissan Code
1. What does the OBDII code B1123 mean on a Nissan?
B1123 indicates an issue with the Diagnosis Sensor Unit, which is part of the airbag system responsible for detecting crash signals and deploying airbags.
2. What are the symptoms of the B1123 code in a Nissan?
Common symptoms include the airbag warning light on the dashboard, failure of the airbags to deploy in an accident, and possible diagnostic trouble codes stored in the airbag control module.
3. What causes the B1123 code in a Nissan?
The code is usually caused by a faulty diagnosis sensor unit, damaged wiring or connectors in the airbag system, or issues with the vehicle's electrical system, such as a weak battery.
4. Can I drive my Nissan with the B1123 code?
While the vehicle may still operate normally, driving with this code active is not recommended, as the airbag system may be compromised and fail to deploy during an accident.
5. How do I troubleshoot the B1123 code on a Nissan?
Start by checking the airbag system wiring and connectors for damage or corrosion. If no issues are found, use a diagnostic scanner to test the diagnosis sensor unit for proper operation.
6. How do I fix the B1123 code in a Nissan?
Common repairs include replacing the diagnosis sensor unit, repairing or replacing damaged wiring or connectors, and clearing the code with a diagnostic scanner.
7. How much does it cost to fix the B1123 code on a Nissan?
The cost can vary based on the issue, but replacing the diagnosis sensor unit typically ranges from $300 to $800, including parts and labor.
8. Can a low battery cause the B1123 code in a Nissan?
Yes, a weak or failing battery can cause voltage issues that trigger the B1123 code. Ensuring the battery is in good condition may resolve the problem.
9. Do I need a professional to fix the B1123 code?
It’s recommended to have a certified technician handle airbag-related repairs, as improper handling can lead to accidental airbag deployment or system failure.
10. How do I reset the airbag warning light after fixing the B1123 code?
Use an OBDII scanner capable of accessing the airbag system to clear the code. If the issue is resolved, the warning light should turn off.
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