B1794 Code - Open In Occupant Classification ECU Battery Positive Line
Quick Answer
This circuit consists of the Occupant Classification ECU and the power source circuit (battery, fuse, wire harness). Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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
- B1794 indicates Open In Occupant Classification ECU Battery Positive Line.
- Common causes
- Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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 B1794 Description
What are the Possible Causes of the DTC B1794?
- Faulty Occupant Detection ECU
- Occupant Detection ECU harness is open or shorted
- Occupant Detection ECU circuit poor electrical connection
How to Fix the DTC B1794?
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 B1794 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
- B1794 Lexus — Open In Occupant Classification ECU Battery Positive Line
- B1794 Scion — Open In Occupant Classification ECU Battery Positive Line
- B1794 Toyota — Open In Occupant Classification ECU Battery Positive Line
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 B1794 Code
1. What are the common symptoms of OBDII code B1794 (Open In Occupant Classification ECU Battery Positive Line)?
The common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the occupant classification system.
2. What causes the OBDII code B1794 to trigger?
The code is triggered when there is an open circuit in the occupant classification ECU battery positive line, which can be caused by damaged wiring or a faulty ECU.
3. How can I diagnose the issue related to code B1794?
Diagnosing the issue involves using an OBDII scanner to read the code, checking the wiring for any visible damage, and testing the ECU for proper functionality.
4. Can I repair the OBDII code B1794 issue myself?
While diagnosing the issue is possible for some DIY enthusiasts, repairing it may require specialized tools and expertise, so seeking professional help is recommended.
5. How much does it typically cost to fix the problem related to code B1794?
The cost of fixing the issue can vary depending on the extent of the damage and whether you choose to repair or replace components. Costs can range from a couple of hundred dollars to over a thousand.
6. Is it safe to drive my vehicle with the OBDII code B1794 present?
It is not advisable to drive the vehicle with the code present, as it indicates a potential issue with the occupant classification system, which is crucial for the proper functioning of airbags in case of an accident.
7. Can resetting the OBDII code B1794 fix the problem?
Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the code to trigger.
8. Are there any recalls related to OBDII code B1794?
Manufacturers occasionally issue recalls for related issues, so it's worth checking with your vehicle manufacturer or the National Highway Traffic Safety Administration (NHTSA) for any relevant recalls.
9. Will the OBDII code B1794 affect the overall performance of my vehicle?
While the code itself may not affect the performance of the vehicle, it can impact the safety features related to the occupant classification system, such as airbag deployment.
10. How can I prevent OBDII code B1794 from occurring in the future?
Regularly checking and maintaining the wiring associated with the occupant classification system, as well as ensuring proper ECU functionality, can help prevent the code from triggering in the future.
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