B1795 Code - Occupant Classification ECU Malfunction
Quick Answer
The Diagnostic Trouble Code (DTC) B1795 is recorded when a malfunction is detected in the Occupant Detection ECU. 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
- B1795 indicates Occupant Classification ECU Malfunction.
- 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 B1795 Description
What are the Possible Causes of the DTC B1795?
- Faulty Occupant Detection ECU
- Occupant Detection ECU harness is open or shorted
- Occupant Detection ECU circuit poor electrical connection
How to Fix the DTC B1795?
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 B1795 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
- B1795 Lexus — Occupant Classification ECU Malfunction
- B1795 Scion — Occupant Classification ECU Malfunction
- B1795 Toyota — Occupant Classification ECU Malfunction
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 B1795 Code
1. What are the common symptoms of OBDII code B1795 - Occupant Classification ECU Malfunction?
- Common symptoms include the airbag warning light staying illuminated on the dashboard, unpredictable airbag deployment, or failure of the airbags to deploy in an accident.
2. What could cause the OBDII code B1795 to trigger?
- The code may be triggered by a malfunction in the Occupant Classification System (OCS) ECU, damaged wiring, a faulty sensor, or problems with the seat weight sensor.
3. How serious is the B1795 code related to the Occupant Classification ECU malfunction?
- This code is serious as it pertains to the proper functioning of the airbag system. It is crucial for safety that the issue is diagnosed and repaired promptly.
4. How can I diagnose the cause of the B1795 code?
- Diagnosing the issue typically involves using a scan tool to retrieve the specific fault code, checking the wiring and connectors for damage, and testing the sensors and ECU for proper functionality.
5. Can I continue to drive my vehicle with the B1795 code present?
- It is not recommended to drive the vehicle with the B1795 code present, as it indicates a potential issue with the airbag system, which is essential for occupant safety in the event of a collision.
6. Are there any DIY repair tips for fixing the Occupant Classification ECU malfunction?
- DIY repair for this issue is not recommended due to the complexity and safety implications of the airbag system. It is best to have a qualified mechanic diagnose and repair the problem.
7. How much does it typically cost to repair the Occupant Classification ECU malfunction?
- The cost of repair can vary depending on the exact cause of the issue. It may range from a couple of hundred dollars for simple fixes like sensor replacement to over a thousand dollars for more extensive repairs involving the ECU.
8. Can resetting the ECU clear the B1795 code?
- Resetting the ECU may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.
9. Is the B1795 code specific to certain vehicle makes and models?
- The B1795 code related to the Occupant Classification ECU malfunction can occur in various vehicle makes and models equipped with OBDII systems.
10. How long does it typically take to repair the Occupant Classification ECU malfunction?
- The repair time can vary depending on the complexity of the issue and the availability of parts. Simple fixes may be completed in a few hours, while more involved repairs could take a day or more.
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