B1138 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
- B1138 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 B1138 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 B1138 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 B1138 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 B1138 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 B1138 Infiniti code?
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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 B1138 Infiniti Code
1. What does the OBDII code B1138 mean on an Infiniti?
The code B1138 indicates a problem with the Diagnosis Sensor Unit, which is part of the airbag system responsible for detecting impacts and deploying airbags.
2. What are the symptoms of code B1138 in an Infiniti?
Common symptoms include the airbag warning light staying on, issues with airbag deployment, and possibly no visible signs of system failure beyond the warning light.
3. What causes the B1138 code to appear?
This code can be triggered by a faulty diagnosis sensor unit, damaged wiring or connectors, or corrosion that disrupts communication within the airbag system.
4. Can I drive my Infiniti with the B1138 code active?
While the vehicle can still be driven, the airbag system may not function correctly in an accident, posing a safety risk. It’s recommended to address the issue promptly.
5. How do you fix the B1138 code on an Infiniti?
Repair typically involves inspecting and replacing the diagnosis sensor unit if it’s faulty, checking for damaged wiring, and ensuring all connectors are secure.
6. How much does it cost to fix the B1138 code?
Repair costs vary, but replacing the diagnosis sensor unit can range from $300 to $800, including parts and labor, depending on your vehicle model and location.
7. What tools are needed to diagnose the B1138 code?
You’ll need an OBDII scanner capable of reading airbag system codes and possibly a multimeter to check wiring continuity.
8. Can a dead battery trigger the B1138 code?
A dead or weak battery can sometimes cause communication errors in the airbag system, but this specific code usually points to a problem with the sensor unit itself.
9. Does the B1138 code require reprogramming after repairs?
In most cases, the airbag control module may need to be reset or reprogrammed using a compatible scan tool after the diagnosis sensor unit is replaced.
10. Is the B1138 code covered under warranty?
If your Infiniti is still under warranty and the issue is related to a manufacturing defect, the repair may be covered. Check with your dealer for details.
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