B1139 Infiniti 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
- B1139 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 B1139 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 B1139 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 B1139 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 B1139 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.
Need more information about the B1139 Infiniti code?
Need more information on how to fix the B1139 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1139 Infiniti code diagnosed by a professional: Find a repair shop in your area
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 B1139 Infiniti Code
1. What does the OBDII code B1139 mean on an Infiniti?
B1139 indicates a fault with the Diagnosis Sensor Unit, which is part of the airbag system responsible for detecting impact and deploying airbags when necessary.
2. What are the common symptoms of code B1139 in an Infiniti?
Common symptoms include the airbag warning light staying illuminated on the dashboard and possible issues with the airbag system not functioning properly.
3. What causes the B1139 Diagnosis Sensor Unit code to appear?
The code can be triggered by a malfunctioning diagnosis sensor unit, poor electrical connections, damaged wiring, or a blown fuse in the airbag system.
4. Can I drive my Infiniti with the B1139 code?
While the car may still drive, it’s unsafe because the airbag system may not function during an accident. It’s important to address the issue promptly.
5. How do I fix the B1139 code in my Infiniti?
Repairs may involve inspecting and replacing the diagnosis sensor unit, repairing or replacing damaged wiring, or clearing the code after resolving the issue.
6. How much does it cost to fix the B1139 code on an Infiniti?
The cost varies depending on the issue. Replacing the diagnosis sensor unit can range from $300 to $600, while wiring repairs may cost less.
7. Can I reset the B1139 code without fixing the problem?
Resetting the code without fixing the root cause will only temporarily clear the airbag light, and the code is likely to return.
8. How is the B1139 code diagnosed?
A technician will use a scan tool to retrieve the code, inspect the diagnosis sensor unit, check for damaged wiring or poor connections, and test the airbag system.
9. Is the B1139 code specific to Infiniti vehicles?
Yes, B1139 is a manufacturer-specific code used by Infiniti and Nissan vehicles to indicate issues with the diagnosis sensor unit in the airbag system.
10. What happens if the B1139 code is ignored?
Ignoring the code means the airbag system may not deploy during a collision, posing a significant safety risk to the driver and passengers.
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