B1204 Nissan 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
- B1204 Nissan 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 B1204 Nissan 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 B1204 Nissan?
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
How to Fix the DTC B1204 Nissan?
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 B1204 Nissan 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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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 B1204 Nissan Code
1. What are the common symptoms of OBDII code B1204 in a Nissan related to the Diagnosis Sensor Unit?
- Common symptoms include issues with the airbag system, such as the airbag warning light staying illuminated or flashing on the dashboard.
2. What are the possible causes of OBDII code B1204 in a Nissan?
- The code B1204 can be triggered by a faulty Diagnosis Sensor Unit, damaged wiring or connectors, or a malfunction in the airbag system.
3. How can I diagnose the Diagnosis Sensor Unit in my Nissan when OBDII code B1204 is present?
- Diagnosis of the Sensor Unit involves checking the wiring and connectors for any damage, ensuring proper connections, and testing the unit itself for functionality using appropriate diagnostic tools.
4. Can I reset the OBDII code B1204 in my Nissan without fixing the issue with the Diagnosis Sensor Unit?
- It is not recommended to reset the code without addressing the underlying issue, as it may pose a safety risk due to potential problems in the airbag system.
5. Are there any DIY repair tips for fixing OBDII code B1204 in a Nissan?
- DIY repair for this code is not recommended, as it involves working with the airbag system which requires expertise and special tools to ensure safety and proper repair.
6. What should I do if I encounter OBDII code B1204 in my Nissan despite not experiencing any symptoms?
- It is still crucial to address the issue promptly by having the Diagnosis Sensor Unit inspected by a qualified mechanic to prevent potential safety hazards in the event of an accident.
7. Is it safe to drive my Nissan with OBDII code B1204 related to the Diagnosis Sensor Unit?
- It is not advisable to drive the vehicle with this code present, as it indicates a problem with the airbag system that could lead to failure in the event of a collision.
8. How much does it typically cost to repair OBDII code B1204 in a Nissan involving the Diagnosis Sensor Unit?
- Repair costs can vary depending on the exact cause of the issue, but it may involve replacing the Diagnosis Sensor Unit, repairing wiring, or addressing other issues in the airbag system.
9. Can a regular mechanic fix OBDII code B1204 in a Nissan, or is it best to visit a dealership?
- While a regular mechanic may be able to diagnose and repair the issue, it is recommended to visit a dealership or a certified technician with expertise in airbag systems for proper diagnosis and repair.
10. How often should I have the Diagnosis Sensor Unit checked in my Nissan to prevent OBDII code B1204 from occurring?
- It is advisable to follow the manufacturer's recommended maintenance schedule and have the airbag system, including the Diagnosis Sensor Unit, checked during routine inspections to prevent potential issues.
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