B1143 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 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 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?
- 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?
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 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
- B1143 Infiniti — Diagnosis Sensor Unit
- B1143 Lexus — Door Side Airbag Sensor Malfunction
- B1143 Nissan — Diagnosis Sensor Unit
- B1143 Scion — Door Side Airbag Sensor Malfunction
- B1143 Toyota — Door Side Airbag Sensor Malfunction
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 Code
1. What are common symptoms associated with OBDII code B1143 (Diagnosis Sensor Unit)?
The common symptoms include an illuminated check engine light, issues with the vehicle's airbag system, and potential loss of power steering assistance.
2. What are the possible causes of OBDII code B1143?
The code B1143 can be triggered by a faulty diagnosis sensor unit, damaged wiring or connectors related to the sensor unit, or issues with the airbag control module.
3. How can I diagnose the Diagnosis Sensor Unit related problems?
Diagnosing B1143 typically involves using a diagnostic scanner to retrieve the trouble code, inspecting the sensor unit and its connections, and performing circuit tests to identify the root cause.
4. Can I still drive my vehicle with OBDII code B1143 present?
It is not recommended to drive the vehicle with an active B1143 code, as it may indicate potential safety hazards related to the airbag system or power steering assistance.
5. How can I repair OBDII code B1143 (Diagnosis Sensor Unit) issues?
Repairing B1143 often involves replacing the faulty diagnosis sensor unit, repairing or replacing damaged wiring or connectors, and resetting the trouble code with a diagnostic scanner.
6. Are there any DIY tips for addressing OBDII code B1143?
While some basic inspections and connector checks can be done by DIY enthusiasts, it is recommended to have a professional mechanic diagnose and repair B1143 issues due to the complexity of airbag system components.
7. How much does it cost to fix OBDII code B1143?
The cost of fixing B1143 can vary depending on the exact cause of the problem, the need for parts replacement, and the labor rates of the repair shop. It's advisable to get a few quotes from trusted mechanics.
8. Is OBDII code B1143 a serious issue?
Yes, B1143 can be a serious issue as it is related to the proper functioning of the airbag system and power steering assistance, both of which are crucial for vehicle safety and control.
9. Can OBDII code B1143 be intermittent?
Yes, B1143 issues can sometimes be intermittent, especially if they are caused by loose connections or wiring problems. It's important to address the problem promptly to avoid potential safety risks.
10. How long does it typically take to repair OBDII code B1143?
The repair time for B1143 can vary depending on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a day to diagnose and fix the problem.
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