B1204 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 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 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?
- 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?
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 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 B1204 code?
Need more information on how to fix the B1204 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1204 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B1204 Ford — Fuel Sender Circuit Short To Ground
- B1204 Infiniti — Diagnosis Sensor Unit
- B1204 Lincoln — Fuel Sender Circuit Short To Ground
- B1204 Mercury — Fuel Sender Circuit Short To Ground
- B1204 Nissan — Diagnosis Sensor Unit
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 Code
1. What are common symptoms of OBDII code B1204 (Diagnosis Sensor Unit)?
The common symptoms of OBDII code B1204 include malfunctioning airbag warning light, faulty airbag system, and potential safety concerns.
2. What are the possible causes of OBDII code B1204?
Possible causes of OBDII code B1204 may include a faulty diagnosis sensor unit, damaged wiring or connectors in the airbag system, or a malfunctioning airbag control module.
3. How can I diagnose OBDII code B1204?
To diagnose OBDII code B1204, it is recommended to use a diagnostic scanner to retrieve the specific fault code, inspect the diagnosis sensor unit and related components for damage, and test the wiring and connectors for continuity.
4. Can OBDII code B1204 be repaired easily?
Repairing OBDII code B1204 typically involves replacing the faulty diagnosis sensor unit, repairing or replacing damaged wiring or connectors, and clearing the fault code with a diagnostic scanner. It is essential to follow proper repair procedures to ensure safety.
5. Is it safe to continue driving with OBDII code B1204 present?
It is not recommended to continue driving with OBDII code B1204 present, as it indicates a potential issue with the airbag system, which could affect its functionality in the event of an accident. It is advisable to address the problem promptly.
6. Are there any DIY repair tips for OBDII code B1204?
DIY repair tips for OBDII code B1204 may include carefully inspecting the diagnosis sensor unit and related components for visible damage, checking the wiring and connectors for loose connections, and consulting the vehicle's service manual for specific repair instructions.
7. How much does it typically cost to repair OBDII code B1204?
The cost to repair OBDII code B1204 can vary depending on the extent of the issue, the cost of replacement parts, and labor charges. It is advisable to obtain quotes from reputable automotive repair shops for an accurate estimate.
8. Can OBDII code B1204 affect the vehicle's performance?
OBDII code B1204 is related to the airbag system and is unlikely to directly affect the vehicle's performance. However, it is crucial to address the issue promptly to ensure the proper functioning of the airbag system in case of an emergency.
9. How often does OBDII code B1204 occur in vehicles?
OBDII code B1204 may occur infrequently in vehicles, but when it does, it is essential to address it promptly due to its implications for the safety of the airbag system.
10. Are there any recalls or technical service bulletins related to OBDII code B1204?
Manufacturers may issue recalls or technical service bulletins related to OBDII code B1204 if it is found to be a common issue in specific vehicle models. It is advisable to check with the vehicle manufacturer or authorized dealers for any relevant information.
Discuss the causes and fixes for B1204 OBDII Code
Code B1204 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
