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Engine-Codes – Generic – B1984

B1984 Code - Seat Switch Lumbar Inflate Circuit Failure

Quick Answer

The B1984 diagnostic trouble code (DTC) indicates that there is a failure within the seat switch lumbar inflate circuit of the vehicle. Common causes include Damaged wiring or connectors in the seat switch lumbar inflate circuit, Faulty seat switch or control module, Malfunctioning lumbar support motor. 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
B1984 indicates Seat Switch Lumbar Inflate Circuit Failure.
Common causes
Common causes include Damaged wiring or connectors in the seat switch lumbar inflate circuit, Faulty seat switch or control module, Malfunctioning lumbar support motor.
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 B1984 Description

The B1984 diagnostic trouble code (DTC) indicates that there is a failure within the seat switch lumbar inflate circuit of the vehicle. This code specifically pertains to the lumbar support feature of the seat, which allows for adjustment to provide additional support to the lower back region. When this circuit fails, it can result in the lumbar support feature not functioning properly or at all.

OBDII Code B1984 - Seat Switch Lumbar Inflate Circuit Failure
B1984 Code - Seat Switch Lumbar Inflate Circuit Failure

Common Causes of B1984

  1. Damaged wiring or connectors in the seat switch lumbar inflate circuit.
  2. Faulty seat switch or control module.
  3. Malfunctioning lumbar support motor.
  4. Corrosion or poor electrical connections within the circuit.
  5. Wear and tear over time from frequent use of the lumbar support feature.

Symptoms of B1984

  1. Inability to adjust or control the lumbar support feature of the seat.
  2. Unusual or erratic movements of the lumbar support mechanism.
  3. Illumination of the airbag warning light on the dashboard.
  4. Audible clicking or grinding noises when attempting to adjust the lumbar support.
  5. Discomfort or back pain experienced while driving due to lack of proper lumbar support.

How to Fix B1984

  1. Diagnose the specific cause of the issue by conducting a comprehensive inspection of the seat switch lumbar inflate circuit.
  2. Repair or replace any damaged wiring, connectors, or components within the circuit.
  3. Test the functionality of the seat switch, control module, and lumbar support motor to identify and address any faulty parts.
  4. Reset the system and clear the DTC from the vehicle's onboard computer.
  5. Conduct a final test drive to ensure that the lumbar support feature is functioning correctly and that the B1984 code does not reappear.

Cost to Fix B1984

The typical repair costs for addressing a B1984 DTC related to the seat switch lumbar inflate circuit failure can vary depending on the extent of the issue and the specific components that need to be repaired or replaced. On average, the repair for this type of problem could range from $150 to $500, including parts and labor. However, it's important to note that the actual costs can be higher or lower based on factors such as location, vehicle make and model, and the rates charged by auto repair shops.

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Code B1984 Information for Specific Makes

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 B1984 Code

1. What are common symptoms of OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure?

Common symptoms include the inability to adjust the lumbar support in the seat, a non-functional lumbar support system, or a warning light on the dashboard.

2. What are the possible causes of OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure?

Possible causes include a faulty seat switch, damaged wiring or connectors in the lumbar inflation circuit, a blown fuse, or a malfunctioning lumbar inflation pump.

3. How can I diagnose OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the code, inspecting the seat switch and lumbar inflation components for visible damage, and testing the wiring and connectors for continuity.

4. Can I still drive my vehicle with OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure?

While the vehicle should still be safe to drive, it is recommended to address the issue promptly to ensure the proper functioning of the lumbar support system and avoid any further damage.

5. How can I repair OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure?

Repair options may include replacing the faulty seat switch, repairing or replacing damaged wiring or connectors, checking and replacing blown fuses, or repairing or replacing the lumbar inflation pump.

6. Is it possible to reset OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure without repairs?

Resetting the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will likely reoccur until the root cause is fixed.

7. Can a DIY enthusiast fix OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure at home?

Depending on the level of expertise, a DIY enthusiast may be able to diagnose and repair this issue at home, especially if they have experience working with automotive electrical systems.

8. Will fixing OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure be expensive?

The cost of fixing this code can vary depending on the exact cause of the issue and whether professional repairs are needed. In some cases, simple fixes like replacing a fuse may be relatively inexpensive.

9. Is OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure common in certain vehicle makes or models?

This code can occur in various vehicle makes and models that are equipped with lumbar support systems, so it's not specific to any particular brand.

10. Can OBDII code B1984 Seat Switch Lumbar Inflate Circuit Failure cause any other problems in the vehicle?

While this code specifically relates to the lumbar support system, unresolved issues with the seat switch or wiring could potentially lead to other electrical problems in the vehicle over time.

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