B1793 Code - Occupant Classification Sensor Power Supply Circuit Malfunction
Quick Answer
The B1793 diagnostic trouble code (DTC) refers to a malfunction in the occupant classification sensor power supply circuit. Common causes include Faulty occupant classification sensor, Damaged wiring or connectors in the power supply circuit, Corrosion or poor connections in the sensor circuit. 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 occupant classification sensor, Damaged wiring or connectors in the power supply circuit, Corrosion or poor connections in the sensor circuit.
- 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.
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Code B1793 Description
The B1793 diagnostic trouble code (DTC) refers to a malfunction in the occupant classification sensor power supply circuit. This sensor is responsible for detecting the weight of the occupant in the front passenger seat and determining whether to activate or deactivate the airbag system. When this circuit malfunctions, it can lead to inaccurate readings or a complete failure of the system, potentially compromising the safety of the vehicle's occupants in the event of a collision.
Common Causes of B1793
- Faulty occupant classification sensor.
- Damaged wiring or connectors in the power supply circuit.
- Corrosion or poor connections in the sensor circuit.
- Defective airbag control module.
- Impact or damage to the front passenger seat affecting sensor readings.
Symptoms of B1793
- Airbag warning light illuminated on the dashboard.
- Inability to turn off the passenger airbag.
- Inconsistent or incorrect airbag deployment based on passenger weight.
- Intermittent or complete loss of airbag functionality.
- Diagnostic trouble code B1793 stored in the vehicle's computer system.
How to Fix B1793
- Begin by conducting a thorough visual inspection of the occupant classification sensor, wiring, and connectors for any signs of damage or corrosion.
- Use a multimeter to test the continuity and voltage of the power supply circuit to identify any electrical faults.
- If the sensor is found to be faulty, replace it with a new, OEM-quality sensor.
- Repair or replace any damaged wiring or connectors in the power supply circuit.
- Clear the DTC from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.
Cost to Fix B1793
The typical repair costs for addressing a B1793 code can vary depending on the specific components that need to be replaced or repaired. In general, the cost of parts for a new occupant classification sensor can range from $100 to $300, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may fall within the range of $200 to $500, including parts and labor. However, it is important to note that actual costs can vary based on factors such as location, vehicle make and model, and the rates of individual auto repair shops. It is advisable to obtain quotes from local shops to get a more accurate estimate for this repair.
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Code B1793 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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