B1793 Code - Occupant Classification Sensor Power Supply Circuit Malfunction
Quick Answer
The Occupant Classification Sensor power supply circuit consists of the Occupant Detection ECU and the occupant classification sensors. Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors), Separate Type Front Seat Cushion Spring Assembly harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly 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
- B1793 indicates Occupant Classification Sensor Power Supply Circuit Malfunction.
- Common causes
- Common causes include Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors), Separate Type Front Seat Cushion Spring Assembly harness is open or shorted, Separate Type Front Seat Cushion Spring Assembly 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 B1793 Description
What are the Possible Causes of the DTC B1793?
- Faulty Separate Type Front Seat Cushion Spring Assembly (Occupant Classification Sensors)
- Separate Type Front Seat Cushion Spring Assembly harness is open or shorted
- Separate Type Front Seat Cushion Spring Assembly circuit poor electrical connection
- Faulty Occupant Detection ECU
How to Fix the DTC B1793?
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 B1793 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
- B1793 Ford — Autolamp Sensor Input Circuit Short To Ground
- B1793 Lexus — Occupant Classification Sensor Power Supply Circuit Malfunction
- B1793 Lincoln — Autolamp Sensor Input Circuit Short To Ground
- B1793 Mercury — Autolamp Sensor Input Circuit Short To Ground
- B1793 Scion — Occupant Classification Sensor Power Supply Circuit Malfunction
- B1793 Toyota — Occupant Classification Sensor Power Supply Circuit 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 B1793 Code
What does the OBDII code B1793 mean?
B1793 indicates a malfunction in the power supply circuit for the occupant classification sensor, which is responsible for determining the presence and weight of passengers in the vehicle's seats.
What are common symptoms of the B1793 code?
Symptoms may include the airbag warning light being illuminated, potential deactivation of passenger airbags, and issues with seat occupancy detection.
What could cause the B1793 code to trigger?
Possible causes include a faulty occupant classification sensor, damaged wiring or connectors, a blown fuse, or issues within the airbag control module.
How can I diagnose the B1793 code?
Start by visual inspection of the wiring and connectors related to the occupant classification sensor. Use a multimeter to check for proper voltage and continuity, and scan the vehicle's OBDII system for additional codes.
Is it safe to drive with the B1793 code present?
While the vehicle may still operate normally, it is not safe to drive with this code as it can disable passenger airbags, increasing the risk of injury in an accident.
What are some common repair tips for the B1793 code?
Repairs often involve replacing the occupant classification sensor, repairing or replacing damaged wiring, or checking and replacing any blown fuses related to the airbag system.
Can I reset the B1793 code after repairs?
Yes, after addressing the underlying issue, you can clear the code using an OBDII scanner. However, ensure the problem is fully resolved to prevent the code from returning.
How much does it typically cost to fix a B1793 code?
Repair costs can vary widely depending on the specific issue, but you might expect to pay anywhere from $100 to $600, including parts and labor.
Will clearing the B1793 code fix the problem?
No, clearing the code will not fix the underlying issue. It is essential to diagnose and repair the source of the malfunction before clearing the code to ensure proper functionality.
Discuss the causes and fixes for B1793 OBDII Code
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