B1142 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
- B1142 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 B1142 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 B1142?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1142?
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 B1142 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
- B1142 Ford — Ignition Status 1 Signal Invalid
- B1142 Infiniti — Diagnosis Sensor Unit
- B1142 Lexus — Door Side Airbag Sensor Malfunction
- B1142 Lincoln — Ignition Status 1 Signal Invalid
- B1142 Mercury — Ignition Status 1 Signal Invalid
- B1142 Nissan — Diagnosis Sensor Unit
- B1142 Scion — Door Side Airbag Sensor Malfunction
- B1142 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 B1142 Code
1. What are the common symptoms of OBDII code B1142 related to the Diagnosis Sensor Unit?
- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the airbag system.
2. What are the possible causes of OBDII code B1142 related to the Diagnosis Sensor Unit?
- The code B1142 could be triggered by a faulty Diagnosis Sensor Unit, damaged wiring, or a problem with the airbag system.
3. How can I diagnose OBDII code B1142 related to the Diagnosis Sensor Unit?
- Diagnosis involves using a diagnostic scanner to retrieve the specific fault code and conducting a thorough inspection of the Diagnosis Sensor Unit and related components.
4. Can I continue to drive my vehicle with OBDII code B1142 related to the Diagnosis Sensor Unit?
- It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the airbag system that could affect its functionality in the event of an accident.
5. How can I repair OBDII code B1142 related to the Diagnosis Sensor Unit?
- Repair may involve replacing the Diagnosis Sensor Unit, repairing damaged wiring, or addressing any other underlying issues with the airbag system as indicated by further diagnosis.
6. Are there any safety precautions I should take when working on OBDII code B1142 related to the Diagnosis Sensor Unit?
- It is crucial to disconnect the vehicle's battery before working on the airbag system to prevent accidental deployment and ensure safety during repairs.
7. Can resetting the OBDII system clear code B1142 related to the Diagnosis Sensor Unit?
- Resetting the OBDII system may temporarily clear the code, but it is essential to diagnose and address the root cause of the issue to prevent the code from reappearing.
8. How do I know if the Diagnosis Sensor Unit needs to be replaced for OBDII code B1142?
- If thorough diagnosis indicates a fault in the Diagnosis Sensor Unit and other potential causes have been ruled out, replacing the unit may be necessary to resolve the issue.
9. Is it possible to repair the Diagnosis Sensor Unit for OBDII code B1142?
- In most cases, the Diagnosis Sensor Unit will need to be replaced rather than repaired, as it is a critical component of the airbag system that requires precise functionality.
10. Can a DIY enthusiast without professional experience fix OBDII code B1142 related to the Diagnosis Sensor Unit?
- While some DIY enthusiasts may have the skills to address simple electrical issues, diagnosing and repairing OBDII code B1142 related to the Diagnosis Sensor Unit is best left to experienced professionals due to the critical nature of the airbag system.
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