B1143 Infiniti Code - Diagnosis Sensor Unit
Quick Answer
The Air Bag Diagnosis Sensor Unit detects the whole Supplemental Restraint System (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
- B1143 Infiniti 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 B1143 Infiniti 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 B1143 Infiniti?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1143 Infiniti?
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 B1143 Infiniti 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 B1143 Infiniti Code
1. What are common symptoms of OBDII code B1143 in an Infiniti?
- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential loss of functionality of the airbag system.
2. What could cause the OBDII code B1143 in an Infiniti?
- The most common cause of code B1143 is a malfunctioning or faulty Diagnosis Sensor Unit (DSU) in the airbag system.
3. How can I diagnose the Diagnosis Sensor Unit (DSU) related to code B1143 in my Infiniti?
- Diagnosis of the DSU involves using a diagnostic scanner to read the specific trouble codes stored in the system and pinpointing the issue with the sensor unit.
4. Is it safe to drive with OBDII code B1143 in an Infiniti?
- It is not recommended to drive with code B1143 present, as it indicates a potential issue with the airbag system, which is a critical safety component in the vehicle.
5. Can I reset the OBDII code B1143 in my Infiniti without addressing the underlying issue?
- While you can clear the code temporarily, it will likely return until the root cause, such as a faulty DSU, is properly diagnosed and repaired.
6. How much does it cost to repair OBDII code B1143 in an Infiniti?
- The cost of repair can vary depending on the exact issue causing code B1143, but it typically involves replacing the Diagnosis Sensor Unit, which can range from a few hundred to a thousand dollars.
7. Are there any DIY repair tips for addressing code B1143 in an Infiniti?
- DIY repair is not recommended for this issue, as it involves the airbag system, which requires specialized knowledge and tools to work on safely and effectively.
8. How long does it take to repair OBDII code B1143 in an Infiniti?
- The repair time can vary based on the exact problem and the availability of parts, but it usually takes a few hours to a full day to diagnose and replace the DSU.
9. Can a mechanic other than a dealership service center repair OBDII code B1143 in an Infiniti?
- Yes, qualified independent mechanics with experience in airbag system diagnostics and repairs can address code B1143 in an Infiniti.
10. Will fixing OBDII code B1143 affect my vehicle's warranty?
- If your vehicle is still under warranty, repairing code B1143 should not impact the warranty as long as the work is done by a certified mechanic using approved parts.
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