Engine-Codes.com
Engine-Codes – Generic – B1871

B1871 Code - Passenger Air Bag Deactivation Switch Fault

Quick Answer

The B1871 diagnostic trouble code indicates a fault with the passenger airbag deactivation switch in the vehicle. Common causes include Faulty passenger airbag deactivation switch, Wiring issues or electrical connection problems, 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
B1871 indicates Passenger Air Bag Deactivation Switch Fault.
Common causes
Common causes include Faulty passenger airbag deactivation switch, Wiring issues or electrical connection problems, 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B1871 Description

The B1871 diagnostic trouble code indicates a fault with the passenger airbag deactivation switch in the vehicle. The passenger airbag deactivation switch is a safety feature that allows the passenger airbag to be turned off in certain situations, such as when a child is seated in the front passenger seat. When this switch malfunctions, it can pose a risk to the safety of the vehicle occupants in the event of a collision.

OBDII Code B1871 - Passenger Air Bag Deactivation Switch Fault
B1871 Code - Passenger Air Bag Deactivation Switch Fault

Common Causes of B1871

  1. Faulty passenger airbag deactivation switch
  2. Wiring issues or electrical connection problems
  3. Malfunctioning airbag control module
  4. Sensor issues within the airbag system
  5. Impact or damage to the passenger airbag deactivation switch

Symptoms of B1871

  1. Airbag warning light illuminated on the dashboard
  2. Inability to deactivate the passenger airbag
  3. Intermittent functioning of the passenger airbag deactivation switch
  4. Audible warning chime when the passenger airbag is supposed to be deactivated
  5. Failure of the passenger airbag to deploy in a crash

How to Fix B1871

  1. Begin by diagnosing the specific cause of the B1871 code using a diagnostic scanner to pinpoint the issue.
  2. Inspect the passenger airbag deactivation switch and its wiring for any visible damage or loose connections.
  3. Test the functionality of the airbag control module and sensors to ensure they are operating correctly.
  4. Replace the faulty passenger airbag deactivation switch if necessary, and repair any damaged wiring or connections.
  5. Clear the diagnostic trouble code from the vehicle's system and test the airbag system to verify that the issue has been resolved.

Cost to Fix B1871

The typical repair costs for addressing a B1871 code related to a passenger airbag deactivation switch fault can range from $200 to $500, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates may also differ between dealerships, independent shops, and metropolitan areas. It is advisable to check local rates for a more accurate estimate of the repair costs associated with this issue.

Need more information about the B1871 code?

Need more information on how to fix the B1871 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1871 code diagnosed by a professional: Find a repair shop in your area

Code B1871 Information for Specific Makes

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 B1871 Code

1. What are common symptoms of OBDII code B1871 (Passenger Air Bag Deactivation Switch Fault)?

- Common symptoms include the airbag warning light on the dashboard illuminating, failure of the passenger airbag to deploy in an accident, and potential loss of communication with the passenger airbag system.

2. What are possible causes of OBDII code B1871?

- Possible causes of this code include a faulty passenger airbag deactivation switch, damaged wiring or connectors in the airbag system, or a malfunctioning airbag control module.

3. How can I diagnose the Passenger Air Bag Deactivation Switch Fault?

- Diagnosing this fault typically involves using a scan tool to retrieve the specific B1871 code, checking the passenger airbag deactivation switch for proper operation, and inspecting the related wiring and connectors for any damage.

4. Is it safe to drive with OBDII code B1871?

- It is not recommended to drive with this code present, as it indicates a fault in the passenger airbag system, which could potentially compromise passenger safety in the event of a collision.

5. Can I reset OBDII code B1871 without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause of the Passenger Air Bag Deactivation Switch Fault is addressed and repaired.

6. How much does it typically cost to repair OBDII code B1871?

- The cost of repairing this code can vary depending on the exact cause of the fault and labor rates in your area. It may involve replacing the passenger airbag deactivation switch, repairing wiring issues, or reprogramming the airbag control module.

7. Are there any DIY repair tips for OBDII code B1871?

- DIY repair for this code may involve visually inspecting the airbag system components for any obvious damage, checking the fuses related to the airbag system, and ensuring all connectors are securely attached.

8. Can a faulty passenger airbag deactivation switch be repaired, or does it need to be replaced?

- In most cases, a faulty passenger airbag deactivation switch will need to be replaced rather than repaired to ensure the proper functioning of the airbag system.

9. How serious is OBDII code B1871 (Passenger Air Bag Deactivation Switch Fault)?

- This code is considered serious as it relates to the proper operation of the passenger airbag system, which is crucial for occupant safety in the event of a collision.

10. Will OBDII code B1871 prevent my vehicle from passing a state inspection?

- Depending on the regulations in your state, a fault code related to the passenger airbag system like B1871 may prevent your vehicle from passing a state inspection due to safety concerns.

Discuss the causes and fixes for B1871 OBDII Code

Submit a New Comment

Code B1871 comments

No comments found for this page.