AutoCodes – Cadillac – B1790 Cadillac

B1790 Cadillac 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 Cadillac 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 668

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

What does this mean?

What are the Possible Causes of the DTC B1790 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

The common symptoms include loss of power lumbar support adjustment in the driver's seat and potential issues with the lumbar motor functionality.

2. What are the possible causes of OBDII code B1790 in a Cadillac indicating an issue with the Driver Seat Motor Lumbar Circuit?

Common causes may include a faulty lumbar motor, damaged wiring or connectors in the lumbar circuit, or a malfunctioning lumbar control switch.

3. How can I diagnose the OBDII code B1790 in my Cadillac for the Driver Seat Motor Lumbar Circuit issue?

Diagnosis involves inspecting the lumbar motor, checking the wiring and connectors for any damage, and testing the lumbar control switch for proper functionality using a multimeter.

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

Repair tips may include replacing the faulty lumbar motor, repairing or replacing damaged wiring or connectors, and ensuring proper connection and functionality of the lumbar control switch.

5. Can OBDII code B1790 in a Cadillac indicating a problem with the Driver Seat Motor Lumbar Circuit be fixed without professional help?

While some DIY enthusiasts may attempt to diagnose and repair this issue, it is recommended to seek professional help to ensure proper diagnosis and repair of the lumbar circuit problem.

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

It is generally safe to drive the vehicle with this issue, but it may result in discomfort due to the loss of lumbar support adjustment in the driver's seat. It is advisable to address the problem promptly.

7. Can resetting the OBDII system clear the B1790 code in a Cadillac with a Driver Seat Motor Lumbar Circuit problem?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear upon further operation of the vehicle.

8. How much does it typically cost to repair OBDII code B1790 in a Cadillac associated with the Driver Seat Motor Lumbar Circuit?

The cost of repair can vary depending on the specific cause of the issue, but it may involve parts and labor expenses ranging from a few hundred to over a thousand dollars, especially if professional help is required.

9. Are there any preventive measures I can take to avoid encountering OBDII code B1790 in my Cadillac related to the Driver Seat Motor Lumbar Circuit?

Regular inspection and maintenance of the lumbar circuit components, such as the motor, wiring, and control switch, can help prevent issues that may trigger the B1790 trouble code.

10. Does the OBDII code B1790 in a Cadillac indicating a problem with the Driver Seat Motor Lumbar Circuit affect the overall performance or safety of the vehicle?

While the issue primarily relates to the driver's seat lumbar support functionality, it does not significantly impact the overall performance or safety of the vehicle. However, addressing the problem can enhance the driver's comfort and convenience.