AutoCodes – Buick – B1790 Buick

B1790 Buick Code - Driver Seat Motor Lumbar Circuit

Quick Answer

The seat adjuster motors are controlled by the Driver Seat Module (DSM) through the adjuster motor control circuits. Common causes include Faulty Driver Seat Motor Lumbar, Driver Seat Motor Lumbar harness is open or shorted, Driver Seat Motor Lumbar 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: B1790 Buick indicates Driver Seat Motor Lumbar Circuit.
Common causes: Common causes include Faulty Driver Seat Motor Lumbar, Driver Seat Motor Lumbar harness is open or shorted, Driver Seat Motor Lumbar 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 635

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 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1790 Buick Description

The seat adjuster motors are controlled by the Driver Seat Module (DSM) through the adjuster motor control circuits. In an inactive state both of the motor control circuits are grounded within the DSM. In an active state the DSM switches the appropriate motor control circuit to battery positive voltage. The direction of the adjuster motor rotation is determined by which of the motor control circuits is switched to battery positive voltage while the other remains grounded. During adjuster motor operation the DSM also monitors the current flow through the motor control circuits.

OBDII Code B1790 Buick - Driver Seat Motor Lumbar Circuit - AutoCodes.com — B1790 Buick Code - Driver Seat Motor Lumbar Circuit

What does this mean?

What are the Possible Causes of the DTC B1790 Buick?

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

How to Fix the DTC B1790 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 B1790 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 B1790 Buick Code

1. What are the common symptoms of OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

The common symptoms include the inability to adjust the lumbar support in the driver's seat, a non-responsive lumbar motor, or erratic movement of the lumbar support.

2. What are the possible causes of OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

Possible causes include a faulty lumbar motor, damaged wiring or connectors in the lumbar circuit, a blown fuse, or a malfunctioning lumbar control switch.

3. How can I diagnose OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

Diagnosis involves checking the lumbar motor for proper functionality, inspecting the wiring and connectors for any damage, testing the fuse related to the lumbar circuit, and verifying the operation of the lumbar control switch.

4. What are some repair tips for fixing OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

Repair tips include replacing a faulty lumbar motor, repairing or replacing damaged wiring and connectors, checking and replacing a blown fuse, and servicing or replacing the lumbar control switch if needed.

5. Can I reset OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reappearing and ensure the proper functioning of the driver's seat lumbar support.

6. Is it safe to continue driving with OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

It is generally safe to drive with this code, but if the driver's seat lumbar support is not functioning correctly, it may affect your comfort and posture while driving, so it is advisable to address the issue promptly.

7. How much does it typically cost to repair OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

The cost of repair can vary depending on the specific cause of the issue, but it may involve expenses for parts such as a new lumbar motor, wiring repairs, or fuse replacement, as well as labor costs if professional help is needed.

8. Can a DIY enthusiast fix OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

DIY enthusiasts with some automotive knowledge and tools may be able to diagnose and repair this issue themselves, especially if it involves tasks like replacing a fuse or checking and repairing wiring connections.

9. Are there any recalls or service bulletins related to OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit?

It is advisable to check with Buick or your local dealership to see if there are any recalls or service bulletins related to this specific OBDII code, as they may provide useful information or assistance with the repair.

10. How can I prevent OBDII code B1790 in a Buick related to the Driver Seat Motor Lumbar Circuit from occurring again in the future?

Regularly checking and maintaining the driver's seat lumbar support system, avoiding putting excessive pressure on the lumbar motor, and addressing any issues promptly can help prevent this OBDII code from reoccurring.