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B1637 Toyota Code - Lost Communication With Rear Airbag Sensor Left

Quick Answer

The B1637 diagnostic trouble code for Toyota vehicles indicates that there is a communication error with the rear airbag sensor located on the left side of the vehicle. Common causes include Faulty rear airbag sensor left, Damaged wiring or poor connections, Corrosion or water damage to sensor components. 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
B1637 Toyota indicates Lost Communication With Rear Airbag Sensor Left.
Common causes
Common causes include Faulty rear airbag sensor left, Damaged wiring or poor connections, Corrosion or water damage to sensor components.
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 09, 2024
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Code B1637 Toyota Description

The B1637 diagnostic trouble code for Toyota vehicles indicates that there is a communication error with the rear airbag sensor located on the left side of the vehicle. This sensor plays a crucial role in detecting impacts or collisions and deploying the airbag to protect the occupants in case of an accident. When communication is lost with this sensor, it can lead to potential safety risks for the vehicle's occupants as the airbag system may not function properly.

OBDII Code B1637 Toyota - Lost Communication With Rear Airbag Sensor Left
B1637 Toyota Code - Lost Communication With Rear Airbag Sensor Left

Common Causes of B1637 Toyota

  1. Faulty rear airbag sensor left.
  2. Damaged wiring or poor connections.
  3. Corrosion or water damage to sensor components.
  4. Issues with the vehicle's ECU communication.
  5. Previous accidents or impacts affecting the sensor's functionality.

Symptoms of B1637 Toyota

  1. Airbag warning light illuminated on the dashboard.
  2. Inability to reset the airbag warning light after clearing the code.
  3. Inconsistent or non-deployment of the airbag in a collision.
  4. Other airbag-related warning lights or messages on the instrument cluster.

How to Fix B1637 Toyota

  1. Begin by conducting a visual inspection of the rear airbag sensor left and its wiring for any visible damage or corrosion.
  2. Test the sensor using a multimeter to check for proper functionality and continuity.
  3. Check the connections and wiring harness for any loose or damaged connections, repairing or replacing them as needed.
  4. Clear the diagnostic trouble code from the vehicle's ECU using a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, consider seeking professional assistance from a qualified mechanic or dealership for further diagnosis and repair.

Cost to Fix B1637 Toyota

The typical repair costs for addressing the B1637 code on a Toyota vehicle can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the cost for parts such as a new rear airbag sensor left and any necessary wiring harnesses can range from $200 to $500. Labor costs for the repair process may add an additional $100 to $300, bringing the total repair estimate to around $300 to $800.

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Information for Specific Toyota Models

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 B1637 Toyota Code

1. What are the common symptoms of OBDII code B1637 Toyota (Lost Communication With Rear Airbag Sensor Left)?

- Common symptoms include the airbag warning light being illuminated on the dashboard, non-functioning rear airbag systems, and potential diagnostic trouble codes related to the left rear airbag sensor.

2. What are the possible causes of OBDII code B1637 Toyota?

- The code B1637 typically indicates a communication error between the vehicle's onboard diagnostic system and the left rear airbag sensor. Common causes include wiring issues, loose connections, or a faulty rear airbag sensor.

3. How can I diagnose the cause of OBDII code B1637 Toyota?

- Diagnosing this code usually involves checking the wiring connections between the vehicle's computer, the left rear airbag sensor, and the airbag control module. Using a diagnostic scanner to retrieve more specific information can help pinpoint the issue.

4. Can OBDII code B1637 Toyota be repaired at home?

- Depending on the cause of the communication error, some DIY enthusiasts may be able to address the issue at home by checking and potentially repairing wiring connections or replacing the left rear airbag sensor. However, if in doubt, it's recommended to seek professional assistance.

5. Is it safe to drive with OBDII code B1637 Toyota present?

- It is not recommended to drive with any airbag-related fault codes present, including B1637. Airbags are critical safety components, and driving with a malfunctioning airbag system can compromise occupant safety in the event of a collision.

6. How much does it typically cost to repair OBDII code B1637 Toyota?

- The cost of repairing OBDII code B1637 can vary depending on the underlying cause. Simple fixes like reconnecting wires may be inexpensive, while replacing a faulty rear airbag sensor or addressing more complex wiring issues could be more costly. It's best to consult a professional for an accurate estimate.

7. Can resetting the OBDII code B1637 Toyota clear the issue?

- Resetting the code may temporarily clear the error from the dashboard, but if the underlying issue causing the communication error persists, the code is likely to reappear. It's important to diagnose and address the root cause of the problem to prevent future occurrences.

8. What should I do if OBDII code B1637 Toyota keeps coming back after repair attempts?

- If the code keeps reappearing after attempted repairs, it's advisable to have a professional technician thoroughly inspect the airbag system and wiring to identify any underlying issues that may have been overlooked during previous repair attempts.

9. Are there any recalls or technical service bulletins related to OBDII code B1637 Toyota?

- It's recommended to check with Toyota's official website or contact a dealership to inquire about any recalls or technical service bulletins related to OBDII code B1637 specific to your vehicle's make, model, and year.

10. Can OBDII code B1637 Toyota affect the functionality of other vehicle systems?

- While the primary concern with OBDII code B1637 is related to the left rear airbag sensor, communication errors within the airbag system can sometimes impact the functionality of other safety systems. It's essential to address the issue promptly to ensure overall vehicle safety.

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