AutoCodes – Pontiac – B1790 Pontiac

B1790 Pontiac 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 Pontiac 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 707

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

What does this mean?

What are the Possible Causes of the DTC B1790 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac Code

1. What are the common symptoms of OBDII code B1790 on a Pontiac related to the driver seat motor lumbar circuit?

The common symptoms include the inability to adjust the lumbar support in the driver's seat or erratic movements of the lumbar support.

2. What are the possible causes of OBDII code B1790 on a Pontiac?

Possible causes of this code can be a malfunctioning driver seat motor, damaged wiring or connectors in the lumbar circuit, or a faulty lumbar switch.

3. How can I diagnose the issue causing OBDII code B1790 on my Pontiac?

To diagnose the issue, you can start by checking the lumbar switch for proper functionality, inspecting the wiring and connectors for any damage, and testing the driver seat motor to ensure it is working correctly.

4. Can I still drive my Pontiac with OBDII code B1790 present?

While it may be possible to drive the vehicle with this code, it is advisable to address the issue promptly to ensure the driver's seat functions properly for comfort and safety reasons.

5. Are there any simple repairs I can attempt to fix OBDII code B1790 on my Pontiac?

You may try checking and repairing any damaged wiring or connectors in the lumbar circuit, as well as ensuring the lumbar switch is functioning correctly. If the issue persists, professional diagnosis and repair may be necessary.

6. Is it safe to reset the OBDII code B1790 on my Pontiac using a diagnostic tool?

Resetting the code may temporarily clear the warning, but it is important to address the underlying issue causing the code to prevent further problems with the driver seat motor lumbar circuit.

7. How much does it typically cost to repair OBDII code B1790 on a Pontiac at a dealership or repair shop?

The cost of repair can vary depending on the exact cause of the issue and the labor rates of the service provider. It is recommended to obtain quotes from different shops for an accurate estimate.

8. Can OBDII code B1790 on a Pontiac be a recurring issue even after repair?

If the root cause of the problem is not properly addressed during repair, there is a possibility that the code may reappear. Thorough diagnosis and repair are essential to prevent recurrence.

9. Is it necessary to replace the entire driver seat motor assembly to resolve OBDII code B1790 on a Pontiac?

In some cases, replacing the driver seat motor assembly may be necessary if the motor itself is faulty and cannot be repaired. However, it is best to confirm this through proper diagnosis before making any decisions.

10. How long does it typically take to repair OBDII code B1790 related to the driver seat motor lumbar circuit on a Pontiac?

The repair duration can vary based on the extent of the issue and the availability of parts. Simple repairs may be completed in a few hours, while more complex issues could take longer.