AutoCodes – GMC – B1790 GMC

B1790 GMC 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 GMC 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 657

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

What does this mean?

What are the Possible Causes of the DTC B1790 GMC?

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 GMC?

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 GMC 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 GMC Code

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

- Common symptoms include the inability to adjust the lumbar support in the driver's seat or erratic movement of the lumbar support.

2. What are the possible causes of OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit?

- The code B1790 can be triggered by a faulty lumbar support motor, damaged wiring or connectors in the circuit, or a malfunctioning lumbar control switch.

3. How can I diagnose the issue causing OBDII code B1790 GMC in the Driver Seat Motor Lumbar Circuit?

- Start by checking the lumbar control switch for proper functionality, inspecting the wiring and connectors for any visible damage, and testing the motor with a multimeter to determine if it is faulty.

4. Are there any quick tips for repairing OBDII code B1790 GMC related to the Driver Seat Motor Lumbar Circuit?

- Quick repair tips include checking and repairing any damaged wiring or connectors, replacing the lumbar support motor if needed, and resetting the error code to see if the issue persists.

5. Can I drive my vehicle with OBDII code B1790 GMC triggered for the Driver Seat Motor Lumbar Circuit?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the driver's seat remains comfortable and adjustable.

6. Is it possible to reset OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit without fixing the underlying issue?

- While you can clear the error code using an OBDII scanner, it is crucial to diagnose and repair the root cause to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code B1790 GMC in 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 support motor or labor for troubleshooting and repair.

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

- DIY enthusiasts with automotive repair knowledge and the right tools can attempt to diagnose and repair this issue, especially if it involves tasks like checking wiring or replacing components.

9. Are there any recalls or technical service bulletins related to OBDII code B1790 GMC for the Driver Seat Motor Lumbar Circuit?

- It's recommended to check with GMC dealership or online resources for any recalls or technical service bulletins specific to this OBDII code to see if there are related known issues or fixes.

10. How can I prevent OBDII code B1790 GMC from recurring in the future for the Driver Seat Motor Lumbar Circuit?

- Regularly inspecting and maintaining the driver's seat lumbar support system, avoiding putting excessive pressure on the lumbar support, and addressing any issues promptly can help prevent the code from coming back.