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Engine-Codes – Generic – B1674

B1674 Code - Seat Driver Occupied Input Circuit Short To Battery

Quick Answer

The B1674 diagnostic trouble code (DTC) refers to the Seat Driver Occupied Input Circuit Short To Battery. Common causes include Damaged wiring or connectors in the seat occupancy sensor circuit, Faulty seat occupancy sensor, Malfunctioning electronic control unit (ECU). 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
B1674 indicates Seat Driver Occupied Input Circuit Short To Battery.
Common causes
Common causes include Damaged wiring or connectors in the seat occupancy sensor circuit, Faulty seat occupancy sensor, Malfunctioning electronic control unit (ECU).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B1674 Description

The B1674 diagnostic trouble code (DTC) refers to the Seat Driver Occupied Input Circuit Short To Battery. This code indicates that there is a short circuit in the circuit responsible for detecting whether the driver's seat is occupied or not. The seat occupancy sensor plays a crucial role in the vehicle's safety systems, particularly the airbag system. When the seat is occupied, it informs the airbag system to deploy in the event of a collision.

OBDII Code B1674 - Seat Driver Occupied Input Circuit Short To Battery
B1674 Code - Seat Driver Occupied Input Circuit Short To Battery

Common Causes of B1674

  1. Damaged wiring or connectors in the seat occupancy sensor circuit
  2. Faulty seat occupancy sensor
  3. Malfunctioning electronic control unit (ECU)
  4. Corrosion in the wiring harness
  5. Short circuit due to water damage or exposure to moisture

Symptoms of B1674

  1. Airbag warning light illuminated on the dashboard
  2. Inability to adjust the driver's seat position
  3. Erratic behavior of the airbag system
  4. Malfunction of seatbelt reminder system
  5. Loss of power to the seat heater or cooling feature

How to Fix B1674

  1. Begin by diagnosing the specific cause of the short circuit using a multimeter to test the continuity of the wiring and connectors.
  2. Replace any damaged wiring or connectors in the seat occupancy sensor circuit.
  3. Check and replace the seat occupancy sensor if it is found to be faulty.
  4. Inspect the electronic control unit (ECU) for any signs of malfunction and replace if necessary.
  5. Clear the DTC using a diagnostic scanner and test the system to ensure the issue has been resolved.

Cost to Fix B1674

The cost of repairing the B1674 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to get a few quotes from different repair shops to ensure you are getting a fair price for the repair.

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Code B1674 Information for Specific Makes

  • B1674 Chrysler — Power Liftgate Close Direction Ratchet Secondary Switch Performance
  • B1674 Dodge — Power Liftgate Close Direction Ratchet Secondary Switch Performance
  • B1674 Jeep — Power Liftgate Close Direction Ratchet Secondary Switch Performance
  • B1674 RAM — Power Liftgate Close Direction Ratchet Secondary Switch Performance
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1674 Code

1. What are the common symptoms of OBDII code B1674 (Seat Driver Occupied Input Circuit Short To Battery)?

- The common symptoms include a malfunctioning airbag system, illuminated airbag warning light on the dashboard, and potential loss of functionality of the driver's seatbelt pretensioner.

2. What are the possible causes of OBDII code B1674?

- The code B1674 can be triggered by a short circuit in the wiring associated with the driver's seat occupancy sensor or a fault in the sensor itself. It can also be caused by issues with the airbag control module.

3. How serious is OBDII code B1674?

- This code should be taken seriously, as it indicates a potential safety issue with the airbag system. It is recommended to address the problem promptly to ensure the proper functionality of the airbag in case of an accident.

4. Can I continue driving with OBDII code B1674 present?

- It is not advisable to continue driving with this code present, as it may compromise the effectiveness of the airbag system in the event of a collision. It is recommended to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose OBDII code B1674?

- Diagnosis of this code typically involves using a diagnostic scanner to retrieve the specific fault codes stored in the vehicle's computer system. Additionally, a visual inspection of the wiring and sensor associated with the driver's seat occupancy system may be necessary.

6. What are some repair tips for fixing OBDII code B1674?

- Repairing this code may involve repairing or replacing damaged wiring, replacing the faulty seat occupancy sensor, or addressing any issues with the airbag control module. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.

7. Will resetting the OBDII code B1674 turn off the airbag warning light?

- Resetting the code may temporarily turn off the airbag warning light, but if the underlying issue causing the fault code is not addressed, the light is likely to come back on. It is essential to diagnose and repair the problem to ensure the proper functioning of the airbag system.

8. Can a DIY enthusiast fix OBDII code B1674 at home?

- While some DIY enthusiasts may have the skills to diagnose and repair simple electrical issues, addressing OBDII code B1674, which involves the airbag system, is best left to experienced professionals due to safety concerns and the complexity of the system.

9. How much does it typically cost to repair OBDII code B1674?

- The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is advisable to obtain quotes from reputable mechanics or service centers for an accurate estimate.

10. Can OBDII code B1674 be prevented?

- While some causes of this code may be due to wear and tear or electrical faults, regular maintenance and inspections of the airbag system can help prevent issues like a short circuit in the seat occupancy sensor wiring. Regularly servicing the vehicle according to the manufacturer's recommendations can also help prevent such faults.

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