AutoCodes – Generic – B1647

B1647 Code - Lost Communication With Side Satellite Sensor Bus Left

Quick Answer

The Side Collision Sensor Left (LH) circuit (to determine deployment of the Front Seat Side Airbag Assembly LH and Curtain Shield Airbag Assembly LH) is composed of the Center Airbag Sensor Assembly, Side Airbag Sensor LH, and Rear Airbag Sensor LH. Common causes include Faulty Side Airbag Sensor Left (LH), Faulty Rear Airbag Sensor Left (LH), Side Airbag Sensor Left harness is open or shorted. 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: B1647 indicates Lost Communication With Side Satellite Sensor Bus Left.
Common causes: Common causes include Faulty Side Airbag Sensor Left (LH), Faulty Rear Airbag Sensor Left (LH), Side Airbag Sensor Left harness is open or shorted.
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.

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Code Popularity 5,698

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 10, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1647 Description

The Side Collision Sensor Left (LH) circuit (to determine deployment of the Front Seat Side Airbag Assembly LH and Curtain Shield Airbag Assembly LH) is composed of the Center Airbag Sensor Assembly, Side Airbag Sensor LH, and Rear Airbag Sensor LH. The Side Airbag Sensor LH and Rear Airbag Sensor LH detect impacts to the vehicle and send signals to the Center Airbag Sensor Assembly to determine if the airbag should be deployed. The Diagnostic Trouble Code (DTC) is stored when a malfunction is detected in the Side Collision Sensor LH circuit (to determine deployment of the Front Seat Side Airbag Assembly LH and Curtain Shield Airbag Assembly LH).

OBDII Code B1647 - Lost Communication With Side Satellite Sensor Bus Left - AutoCodes.com — B1647 Code - Lost Communication With Side Satellite Sensor Bus Left

What does this mean?

What are the Possible Causes of the DTC B1647?

Faulty Side Airbag Sensor Left (LH)
Faulty Rear Airbag Sensor Left (LH)
Side Airbag Sensor Left harness is open or shorted
Side Airbag Sensor Left circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1647?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1647 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1647 code?

Need more information on how to fix the B1647 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1647 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1647 Acura — Passenger Door LF Antenna Circuit Short
B1647 Chrysler — Rear Right Turn Control Circuit Low
B1647 Dodge — Rear Right Turn Control Circuit Low
B1647 Honda — Passenger Door LF Antenna Circuit Short
B1647 Jeep — Rear Right Turn Control Circuit Low
B1647 Lexus — Lost Communication With Side Satellite Sensor Bus Left
B1647 RAM — Rear Right Turn Control Circuit Low
B1647 Scion — Lost Communication With Side Satellite Sensor Bus Left
B1647 Toyota — Lost Communication With Side Satellite Sensor Bus 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 B1647 Code

1. What are the common symptoms of OBDII code B1647 (Lost Communication With Side Satellite Sensor Bus Left)?

- Common symptoms include the airbag warning light illuminating on the dashboard, loss of communication with the side satellite sensor on the left side, and potential issues with the airbag system.

2. What are some possible causes of OBDII code B1647?

- Possible causes include a faulty side satellite sensor on the left side, damaged wiring or connectors, a malfunctioning airbag control module, or a communication error within the system.

3. How can I diagnose the issue related to OBDII code B1647?

- Diagnosing the issue involves using a diagnostic scan tool to retrieve the trouble codes, inspecting the wiring and connectors for damage, testing the side satellite sensor on the left side, and checking the airbag control module for faults.

4. Is it safe to drive with OBDII code B1647 present?

- It is not recommended to drive with this code present, as it indicates a potential issue with the airbag system, which is a critical safety component in the vehicle.

5. How can I repair OBDII code B1647?

- Repairing this code may involve replacing the faulty side satellite sensor on the left side, repairing or replacing damaged wiring and connectors, resetting the airbag control module, and clearing the trouble codes with a diagnostic scan tool.

6. Can I reset OBDII code B1647 without fixing the underlying issue?

- While you can clear the trouble code temporarily, it is important to address the underlying issue causing the code to prevent potential safety risks and ensure the proper functioning of the airbag system.

7. Are there any DIY repair tips for OBDII code B1647?

- DIY repair tips may include checking and securing the wiring and connectors related to the side satellite sensor, ensuring proper connections, and following the manufacturer's service manual for specific troubleshooting steps.

8. How can a professional mechanic help with OBDII code B1647?

- A professional mechanic can perform a thorough diagnosis of the issue, accurately pinpoint the cause of the code, utilize specialized tools for testing and repairs, and ensure the proper functioning of the airbag system after repairs are made.

9. What other related codes or issues might be associated with OBDII code B1647?

- Other related codes may include communication errors with other airbag system components, such as the right side satellite sensor, airbag control module, or other sensor modules in the vehicle.

10. Can OBDII code B1647 be intermittent or permanent?

- This code can be either intermittent, where the communication loss occurs sporadically, or permanent, indicating a persistent issue that needs to be addressed promptly to ensure the safety of the airbag system.