B1637 Code - Lost Communication With Rear Airbag Sensor Left

Quick Answer

The diagnostic trouble code B1637 indicates that there is a communication failure with the rear airbag sensor located on the left side of the vehicle. Common causes include Faulty rear airbag sensor on the left side, Wiring issues or a short circuit in the airbag system, Malfunctioning airbag control module. 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 indicates Lost Communication With Rear Airbag Sensor Left.

Common causes

Common causes include Faulty rear airbag sensor on the left side, Wiring issues or a short circuit in the airbag system, Malfunctioning airbag control module.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
• Comments
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Common Causes of B1637

Symptoms of B1637

How to Fix B1637

Cost to Fix B1637

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Code B1637 Information for Specific Makes

• B1637 Chrysler — Right High Beam Control Circuit Low
• B1637 Dodge — Right High Beam Control Circuit Low
• B1637 Jeep — Right High Beam Control Circuit Low
• B1637 Lexus — Lost Communication With Rear Airbag Sensor Left
• B1637 RAM — Right High Beam Control Circuit Low
• B1637 Scion — Lost Communication With Rear Airbag Sensor Left
• B1637 Toyota — Lost Communication With Rear Airbag Sensor Left

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 Code

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

- Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the left rear airbag system.

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

- Potential causes include a faulty rear airbag sensor, damaged wiring or connectors, a blown fuse, or a communication error within the vehicle's network.

3. How can I diagnose the issue related to OBDII code B1637?

- Diagnosing the issue involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors for damage, and testing the rear airbag sensor for proper functionality.

4. Can I continue driving my vehicle with OBDII code B1637 present?

- It is not recommended to drive the vehicle with an active airbag-related fault code, as it may compromise the safety of the airbag system in the event of a collision.

5. How can I repair OBDII code B1637 (Lost Communication With Rear Airbag Sensor Left)?

- Repairing the issue may involve replacing the faulty rear airbag sensor, repairing or replacing damaged wiring or connectors, checking and replacing any blown fuses, and clearing the trouble codes with a diagnostic scanner.

6. Is it possible to reset OBDII code B1637 without fixing the underlying issue?

- Resetting the code without addressing the root cause may temporarily clear the warning light, but the issue will likely reoccur until the problem is properly diagnosed and repaired.

7. Are there any safety concerns associated with OBDII code B1637?

- Yes, unresolved airbag system faults can pose a safety risk by potentially preventing the airbags from deploying correctly in the event of a collision.

8. Can a DIY enthusiast fix OBDII code B1637 at home?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this issue at home. However, working with airbag systems requires caution and expertise.

9. How much can I expect to pay to repair OBDII code B1637 at a professional auto repair shop?

- The cost of repairing this code can vary depending on the specific cause of the issue, but it may involve diagnostic fees, parts replacement costs, and labor charges. It's advisable to obtain quotes from multiple repair shops.

10. Will fixing OBDII code B1637 require resetting the airbag system or performing any special procedures?

- After repairing the issue, it may be necessary to clear the trouble codes and reset the airbag system using a diagnostic scanner to ensure proper functionality and safety.