AutoCodes – Buick – B1850 Buick

B1850 Buick Code - Driver Seat Lumbar Position Sensor Circuit

Quick Answer

The Driver Seat Module (DSM) monitors the positions of most of the seat adjuster motors using hall effect type position sensors. Common causes include Faulty Driver Seat Lumbar Position Sensor, Driver Seat Lumbar Position Sensor harness is open or shorted, Driver Seat Lumbar Position Sensor 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: B1850 Buick indicates Driver Seat Lumbar Position Sensor Circuit.
Common causes: Common causes include Faulty Driver Seat Lumbar Position Sensor, Driver Seat Lumbar Position Sensor harness is open or shorted, Driver Seat Lumbar Position Sensor 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 926

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 Jul 31, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1850 Buick Description

The Driver Seat Module (DSM) monitors the positions of most of the seat adjuster motors using hall effect type position sensors. The hall effect position sensors are supplied with battery positive reference and ground circuits from the DSM. The position sensor signal circuits are supplied battery positive voltage through a resistor then monitored within the DSM. During adjuster motor operation the hall effect position sensor provides a single pulse for every adjuster motor shaft rotation. The DSM counts the pulses from the position sensor signal circuits to determine the adjuster motor positions when storing or recalling memory seat position settings.

OBDII Code B1850 Buick - Driver Seat Lumbar Position Sensor Circuit - AutoCodes.com — B1850 Buick Code - Driver Seat Lumbar Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B1850 Buick?

Faulty Driver Seat Lumbar Position Sensor
Driver Seat Lumbar Position Sensor harness is open or shorted
Driver Seat Lumbar Position Sensor circuit poor electrical connection
Faulty Driver Seat Module (DSM)

How to Fix the DTC B1850 Buick?

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 B1850 Buick 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.

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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 B1850 Buick Code

1. What are common symptoms of OBDII code B1850 in a Buick related to the driver seat lumbar position sensor circuit?

- Common symptoms include a malfunctioning or non-responsive driver seat lumbar support system, the inability to adjust the lumbar support, or an illuminated airbag warning light on the dashboard.

2. What are the possible causes of OBDII code B1850 in a Buick?

- The code B1850 in a Buick related to the driver seat lumbar position sensor circuit is often caused by a faulty lumbar position sensor, damaged wiring or connectors, or a malfunctioning control module.

3. How can I diagnose the OBDII code B1850 in my Buick's driver seat lumbar position sensor circuit?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, performing visual inspections of the wiring and connectors, and testing the lumbar position sensor for proper function.

4. Can I repair the OBDII code B1850 in my Buick related to the driver seat lumbar position sensor circuit myself?

- While some DIY enthusiasts may be able to diagnose and repair this issue, it is recommended to consult a qualified mechanic or dealership for proper diagnosis and repair to ensure safety and accuracy.

5. Are there any temporary fixes for OBDII code B1850 in a Buick's driver seat lumbar position sensor circuit?

- In some cases, resetting the vehicle's computer system by disconnecting the battery for a few minutes may temporarily clear the code, but it is important to address the root cause to prevent the issue from recurring.

6. How much does it typically cost to repair OBDII code B1850 in a Buick related to the driver seat lumbar position sensor circuit?

- Repair costs can vary depending on the specific cause of the issue, but they may range from $100 to $300 for parts and labor, excluding diagnostic fees.

7. Is it safe to drive my Buick with OBDII code B1850 related to the driver seat lumbar position sensor circuit?

- While the vehicle may still be operable with this code, it is recommended to have the issue diagnosed and repaired promptly to ensure the proper functioning of the driver seat lumbar support system and airbag system.

8. Will OBDII code B1850 in my Buick's driver seat lumbar position sensor circuit affect the vehicle's overall performance?

- This code is primarily related to the driver seat lumbar support system and airbag system, so it should not significantly impact the vehicle's overall performance, but it can affect comfort and safety features.

9. How long does it typically take to repair OBDII code B1850 in a Buick related to the driver seat lumbar position sensor circuit?

- The repair time can vary depending on the cause of the issue and the availability of parts, but it may take anywhere from 1 to 3 hours to diagnose and repair the problem.

10. Can OBDII code B1850 in a Buick related to the driver seat lumbar position sensor circuit cause any other problems in the vehicle?

- While the main issue is related to the driver seat lumbar support system, unresolved problems with the sensor circuit can potentially affect the functionality of other related systems, such as the airbag system.