B1140 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
- B1140 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 B1140 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 B1140 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 B1140 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 B1140 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 B1140 Nissan Code
1. What are the common symptoms of OBDII code B1140 in a Nissan related to the Diagnosis Sensor Unit?
- Common symptoms include issues with airbag warning lights illuminating on the dashboard or airbag system malfunctions.
2. What are the possible causes of OBDII code B1140 related to the Diagnosis Sensor Unit in a Nissan?
- The code B1140 can be triggered by a faulty Diagnosis Sensor Unit, damaged wiring, or a poor connection in the airbag system.
3. How can I diagnose the OBDII code B1140 in my Nissan related to the Diagnosis Sensor Unit?
- Diagnosis of the B1140 code typically involves using an OBDII scanner to retrieve the specific fault code and then inspecting the Diagnosis Sensor Unit and its related components.
4. Can I repair the OBDII code B1140 related to the Diagnosis Sensor Unit in my Nissan on my own?
- While some DIY enthusiasts may attempt to address this issue, it is recommended to consult a professional mechanic or authorized service center due to the complexity of airbag system repairs.
5. Are there any troubleshooting tips for resolving the OBDII code B1140 in a Nissan linked to the Diagnosis Sensor Unit?
- Checking the wiring harness for any visible damage, ensuring all connections are secure, and resetting the airbag system may sometimes resolve the B1140 code.
6. Is it safe to drive my Nissan with the OBDII code B1140 related to the Diagnosis Sensor Unit illuminated?
- It is not recommended to drive the vehicle with the B1140 code present, as it indicates a potential issue with the airbag system, which is crucial for occupant safety in the event of a collision.
7. How much does it typically cost to repair the OBDII code B1140 in a Nissan involving the Diagnosis Sensor Unit?
- The cost of repairing the B1140 code can vary depending on the exact cause of the issue, but it may involve replacing the Diagnosis Sensor Unit or repairing/replacing damaged wiring, which can range from a few hundred to a few thousand dollars.
8. Can a simple reset of the OBDII system clear the B1140 code related to the Diagnosis Sensor Unit in my Nissan?
- A simple reset may temporarily clear the code, but if the underlying issue causing the B1140 code is not addressed, it is likely to reappear once the problem resurfaces.
9. Are there any recalls or technical service bulletins related to the OBDII code B1140 in Nissan vehicles with Diagnosis Sensor Unit concerns?
- It is recommended to check with Nissan or authorized service centers for any recalls or technical service bulletins related to the B1140 code to see if there are any known issues or remedies provided by the manufacturer.
10. How important is it to address the OBDII code B1140 in a Nissan related to the Diagnosis Sensor Unit promptly?
- It is crucial to address the B1140 code promptly, as it indicates a potential problem with the airbag system, which plays a critical role in occupant safety during a collision. Delaying repairs could compromise the effectiveness of the airbags in protecting vehicle occupants.
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