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Engine-Codes – Generic – B1B89

B1B89 Code - Passenger Seat Weight Sensor 1 Right Rear Input Circuit High

Quick Answer

The B1B89 diagnostic trouble code (DTC) indicates a problem with the passenger seat weight sensor 1 right rear input circuit being too high. Common causes include Faulty passenger seat weight sensor, Wiring harness damage or loose connections, Corrosion in the sensor or wiring connections. 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
B1B89 indicates Passenger Seat Weight Sensor 1 Right Rear Input Circuit High.
Common causes
Common causes include Faulty passenger seat weight sensor, Wiring harness damage or loose connections, Corrosion in the sensor or wiring connections.
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 08, 2024
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Code B1B89 Description

The B1B89 diagnostic trouble code (DTC) indicates a problem with the passenger seat weight sensor 1 right rear input circuit being too high. This sensor is responsible for detecting the weight of the passenger in the right rear seat and providing this information to the vehicle's restraint system, such as the airbag system. When the sensor detects an unusually high input signal, it can trigger the B1B89 code, signaling that there may be an issue with the sensor or its circuit.

OBDII Code B1B89 - Passenger Seat Weight Sensor 1 Right Rear Input Circuit High
B1B89 Code - Passenger Seat Weight Sensor 1 Right Rear Input Circuit High

Common Causes of B1B89

  1. Faulty passenger seat weight sensor.
  2. Wiring harness damage or loose connections.
  3. Corrosion in the sensor or wiring connections.
  4. Issues with the airbag control module.
  5. Internal fault within the restraint system.

Symptoms of B1B89

  1. Airbag warning light illuminated on the dashboard.
  2. Inconsistent or improper deployment of airbags.
  3. Loss of communication with the passenger seat weight sensor.
  4. Fault codes related to the airbag system stored in the vehicle's computer.
  5. Passenger airbag indicator showing incorrect information.

How to Fix B1B89

  1. Begin by performing a thorough inspection of the wiring harness and sensor connections for any visible damage, corrosion, or loose connections. Repair or replace any damaged components.
  2. Use a multimeter to test the resistance of the passenger seat weight sensor to determine if it is functioning properly. Replace the sensor if necessary.
  3. Clear the DTCs from the vehicle's computer using a diagnostic scan tool to reset the system and turn off the airbag warning light.
  4. If the issue persists, further diagnosis may be required to check the airbag control module and other components of the restraint system for faults.
  5. Once the specific cause of the high input signal is identified and repaired, perform a thorough system test to ensure proper functioning of the passenger seat weight sensor and the airbag system.

Cost to Fix B1B89

The typical repair costs for addressing the B1B89 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair for a faulty passenger seat weight sensor or wiring harness damage could range from $200 to $500, including parts and labor. However, if the issue is related to the airbag control module or other components, the costs may increase significantly. It is recommended to consult with a professional technician for an accurate diagnosis and repair estimate. Keep in mind that labor rates at dealerships or in metropolitan areas may be higher, while independent shops may offer more affordable rates.

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Code B1B89 Information for Specific Makes

  • B1B89 Chrysler — Passenger Seat Weight Sensor 1 Right Rear Input Circuit High
  • B1B89 Dodge — Passenger Seat Weight Sensor 1 Right Rear Input Circuit High
  • B1B89 Jeep — Passenger Seat Weight Sensor 1 Right Rear Input Circuit High
  • B1B89 Mitsubishi — Passenger Seat Weight Sensor 1 Right Rear Input Circuit High
  • B1B89 RAM — Passenger Seat Weight Sensor 1 Right Rear Input Circuit High

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.

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 B1B89 Code

1. What are the common symptoms of OBDII code B1B89 (Passenger Seat Weight Sensor 1 Right Rear Input Circuit High)?

The common symptoms of this code may include the airbag warning light illuminating on the dashboard and the passenger airbag system malfunctioning.

2. What are the possible causes of OBDII code B1B89?

Possible causes of this code include a faulty passenger seat weight sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning airbag control module.

3. How can I diagnose the issue related to OBDII code B1B89?

Diagnosing this issue typically involves using a diagnostic scanner to retrieve the specific fault codes, inspecting the passenger seat weight sensor and its circuit for any visible damage, and testing the sensor's resistance values.

4. Can I continue driving my vehicle with OBDII code B1B89?

It is not recommended to drive the vehicle with this code present, as it indicates a potential issue with the passenger airbag system, which may affect its proper functionality in the event of a collision.

5. How can I repair OBDII code B1B89 (Passenger Seat Weight Sensor 1 Right Rear Input Circuit High)?

Repairing this code may involve replacing the faulty passenger seat weight sensor, repairing any damaged wiring or connectors in the circuit, or resetting the airbag control module after making necessary repairs.

6. Is it safe to reset the OBDII code B1B89 without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily turn off the warning light, but it will not fix the root cause of the issue, potentially leaving the passenger airbag system compromised.

7. Are there any DIY tips for troubleshooting OBDII code B1B89?

While some basic inspection and testing can be done by DIY enthusiasts, diagnosing and repairing this code may require specialized tools and knowledge, making it advisable to consult a professional mechanic.

8. How much does it cost to fix OBDII code B1B89?

The cost of fixing this code can vary depending on the specific cause of the issue, the extent of repairs needed, and labor rates in your area. It's recommended to get a diagnosis from a mechanic for an accurate estimate.

9. Can OBDII code B1B89 be a false alarm?

While it's possible for a code to be triggered erroneously due to sensor malfunctions or temporary glitches, it's important to investigate the issue thoroughly to ensure the safety and proper functioning of the airbag system.

10. Is OBDII code B1B89 a common issue in certain vehicle makes and models?

This specific code may be more prevalent in vehicles equipped with advanced airbag systems and passenger weight sensors, but its occurrence can vary across different makes and models.

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