B1140 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 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 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?
- 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?
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 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
- B1140 Acura — Driver Side Power Window Position Detect Circuit Error
- B1140 Honda — Driver Side Power Window Position Detect Circuit Error
- B1140 Infiniti — Diagnosis Sensor Unit
- B1140 Lexus — Side Airbag Sensor Assembly Malfunction
- B1140 Nissan — Diagnosis Sensor Unit
- B1140 Scion — Side Airbag Sensor Assembly Malfunction
- B1140 Toyota — Side Airbag Sensor Assembly 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 B1140 Code
1. What are the common symptoms of OBDII code B1140 (Diagnosis Sensor Unit)?
The common symptoms of OBDII code B1140 include the airbag warning light on the dashboard staying illuminated and possible issues with the airbag system's functionality.
2. What causes the OBDII code B1140 to appear?
The OBDII code B1140 typically appears due to a malfunction in the Diagnosis Sensor Unit, which is responsible for monitoring the airbag system's operation.
3. How can I diagnose the issue related to OBDII code B1140?
Diagnosing the issue related to OBDII code B1140 usually involves using a professional OBDII scanner to retrieve the specific fault codes and then inspecting the Diagnosis Sensor Unit and related wiring for any damage or loose connections.
4. Can I still drive my vehicle with the OBDII code B1140 present?
It is not recommended to drive the vehicle with the OBDII code B1140 present, as it indicates a potential problem with the airbag system, which is crucial for passenger safety in case of a collision.
5. What are some repair tips for resolving OBDII code B1140?
Repairing OBDII code B1140 may involve replacing the faulty Diagnosis Sensor Unit, repairing any damaged wiring, or resetting the airbag system using a professional diagnostic tool.
6. How much does it typically cost to fix OBDII code B1140?
The cost of fixing OBDII code B1140 can vary depending on the extent of the issue and the specific repairs needed, but it may range from a few hundred to a few thousand dollars, including parts and labor.
7. Are there any safety concerns associated with OBDII code B1140?
Yes, there are safety concerns associated with OBDII code B1140, as it indicates a potential problem with the airbag system, which may fail to deploy properly in the event of a collision if the issue is not addressed promptly.
8. Can I reset the OBDII code B1140 on my own?
While you can attempt to reset the OBDII code B1140 on your own using an OBDII scanner, it is crucial to diagnose and address the underlying issue causing the code to prevent it from reoccurring.
9. Is it necessary to visit a mechanic for OBDII code B1140, or can I fix it myself?
While some DIY enthusiasts may attempt to fix OBDII code B1140 themselves, it is generally recommended to visit a qualified mechanic or automotive technician for proper diagnosis and repair to ensure the airbag system's safety and functionality.
10. How long does it typically take to repair OBDII code B1140?
The time required to repair OBDII code B1140 can vary depending on the specific issue and the availability of parts, but it may take a few hours to a day to diagnose and fix the problem properly.
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