AutoCodes – Generic – B1721

B1721 Code - Seat Driver Rearward Switch Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Seat Driver Rearward Switch. Common causes include Faulty Seat Driver Rearward Switch, Seat Driver Rearward Switch harness is open or shorted, Seat Driver Rearward Switch circuit poor electrical connection. 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: B1721 indicates Seat Driver Rearward Switch Circuit Failure.
Common causes: Common causes include Faulty Seat Driver Rearward Switch, Seat Driver Rearward Switch harness is open or shorted, Seat Driver Rearward Switch circuit poor electrical connection.
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 4,503

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 Jun 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1721 Description

The Body Control Module (BCM) monitors the Seat Driver Rearward Switch. The BCM sets the OBDII code when the Seat Driver Rearward Switch is not to factory specifications.

OBDII Code B1721 - Seat Driver Rearward Switch Circuit Failure - AutoCodes.com — B1721 Code - Seat Driver Rearward Switch Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1721?

Faulty Seat Driver Rearward Switch
Seat Driver Rearward Switch harness is open or shorted
Seat Driver Rearward Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1721?

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 B1721 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 B1721 code?

Need more information on how to fix the B1721 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1721 code diagnosed by a professional: Find a repair shop in your area

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 B1721 Code

1. What are the common symptoms of OBDII code B1721 (Seat Driver Rearward Switch Circuit Failure)?

- The common symptoms include the inability to adjust the driver's seat rearward or erratic seat movement.

2. What are the potential causes of OBDII code B1721?

- The causes can range from a faulty rearward seat switch, damaged wiring in the seat adjustment system, or a malfunctioning control module.

3. How can I diagnose the issue related to OBDII code B1721?

- To diagnose the issue, you can start by checking the wiring and connections related to the driver's seat adjustment system, testing the rearward seat switch for proper functionality, and using a diagnostic scan tool to read the trouble codes.

4. Can I still drive my vehicle with OBDII code B1721 present?

- While the vehicle may still be drivable with this code, it is recommended to address the issue promptly to ensure the proper functioning of the driver's seat adjustment system.

5. Is it possible to reset OBDII code B1721 without fixing the underlying issue?

- Resetting the code without addressing the root cause will only temporarily clear the error code. It is crucial to fix the issue triggering the code for a permanent solution.

6. Are there any DIY repair tips for resolving OBDII code B1721?

- DIY repair tips may include checking and repairing any damaged wiring, replacing the faulty rearward seat switch if necessary, and ensuring all connections are secure.

7. Should I seek professional help to fix OBDII code B1721?

- If you are not confident in diagnosing or repairing electrical issues in your vehicle, it is advisable to seek professional help from a certified mechanic or automotive technician.

8. How much does it typically cost to repair OBDII code B1721 at a repair shop?

- The cost of repairing OBDII code B1721 can vary depending on the root cause of the issue, labor rates, and parts needed. It is recommended to obtain quotes from different repair shops for an accurate estimate.

9. Can OBDII code B1721 be a recurring issue even after repair?

- If the underlying cause of the code is not properly addressed during repair, it is possible for OBDII code B1721 to recur. Thorough diagnosis and effective repair are essential to prevent recurrence.

10. Is it necessary to clear OBDII code B1721 after fixing the issue?

- Clearing the code after fixing the problem is recommended to reset the vehicle's system and ensure that the repair was successful.