B1638 Code - Rear Airbag Sensor Assembly Left Initialization Incomplete

Quick Answer

The B1638 diagnostic trouble code indicates that the rear airbag sensor assembly on the left side of the vehicle has not completed its initialization process. Common causes include Faulty rear airbag sensor assembly on the left side, Wiring or connection issues related to the sensor, Electrical problems within the airbag system. 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

B1638 indicates Rear Airbag Sensor Assembly Left Initialization Incomplete.

Common causes

Common causes include Faulty rear airbag sensor assembly on the left side, Wiring or connection issues related to the sensor, Electrical problems within the airbag system.

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
• Add Comment

Common Causes of B1638

Symptoms of B1638

How to Fix B1638

Cost to Fix B1638

Need more information about the B1638 code?

Need more information on how to fix the B1638 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1638 code diagnosed by a professional: Find a repair shop in your area

Code B1638 Information for Specific Makes

• B1638 Chrysler — Right High Beam Control Circuit High
• B1638 Dodge — Right High Beam Control Circuit High
• B1638 Jeep — Right High Beam Control Circuit High
• B1638 Lexus — Rear Airbag Sensor Assembly Left Initialization Incomplete
• B1638 RAM — Right High Beam Control Circuit High
• B1638 Scion — Rear Airbag Sensor Assembly Left Initialization Incomplete
• B1638 Toyota — Rear Airbag Sensor Assembly Left Initialization Incomplete

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 B1638 Code

1. What are the common symptoms of OBDII code B1638 (Rear Airbag Sensor Assembly Left Initialization Incomplete)?

The common symptoms include the airbag warning light illuminating on the dashboard and a potential loss of functionality in the rear left airbag system.

2. What can cause OBDII code B1638 to trigger?

This code is typically triggered when the rear airbag sensor assembly on the left side of the vehicle fails to initialize properly, often due to faulty wiring, sensor malfunctions, or issues with the airbag control module.

3. How serious is OBDII code B1638?

While the vehicle may still be operable with this code present, it is crucial to address it promptly to ensure the proper functioning of the rear airbag system in case of an accident.

4. How can I diagnose OBDII code B1638?

Diagnosing this code usually involves using a diagnostic scanner to retrieve the specific fault codes stored in the airbag system, followed by a thorough inspection of the rear airbag sensor assembly and related components.

5. Can I repair OBDII code B1638 on my own?

While some experienced DIYers may be able to troubleshoot and repair this code, it is recommended to seek assistance from a professional mechanic or technician due to the complexity and safety considerations involved.

6. What are some tips for repairing OBDII code B1638?

Repair tips may include checking the wiring harness for damage, testing the rear airbag sensor assembly for proper functionality, and resetting the airbag control module after any repairs have been made.

7. Is it safe to drive with OBDII code B1638 present?

It is not ideal to drive with this code active, as it indicates a potential issue with the rear airbag system that may compromise passenger safety in the event of a collision.

8. How much does it cost to repair OBDII code B1638?

The cost of repairing this code can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain estimates from reputable repair shops.

9. Can OBDII code B1638 affect other vehicle systems?

While this code specifically relates to the rear airbag sensor assembly on the left side, it is essential to address it promptly to prevent any potential impact on the overall airbag system's functionality.

10. How long does it take to repair OBDII code B1638?

The repair time can vary based on the diagnosis, parts availability, and the complexity of the repair process. In some cases, it may be a relatively quick fix, while in others, it may require more extensive troubleshooting and repairs.