AutoCodes – Generic – B1740

B1740 Code - Driver Seat Front Down Switch Circuit

Quick Answer

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster Switch 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: B1740 indicates Driver Seat Front Down Switch Circuit.
Common causes: Common causes include Faulty Driver Seat Adjuster Switch, Driver Seat Adjuster Switch harness is open or shorted, Driver Seat Adjuster Switch 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 5,295

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 Apr 23, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1740 Description

The Seat Memory Control Module supplies a reference voltage to each signal circuit of the Driver Seat Adjuster Switch. When the power seat or lumbar switches are pressed, the appropriate signal circuit from the Seat Memory Control Module is pulled low through the switch contacts indicating the power seat command. The Seat Memory Control Module then commands the driver seat or lumbar to move in response to the switch signals. The Diagnostic Trouble Code (DTC) will be set when there is a short to ground on a switch signal circuit.

OBDII Code B1740 - Driver Seat Front Down Switch Circuit - AutoCodes.com — B1740 Code - Driver Seat Front Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1740?

Faulty Driver Seat Adjuster Switch
Driver Seat Adjuster Switch harness is open or shorted
Driver Seat Adjuster Switch circuit poor electrical connection
Faulty Seat Memory Control Module

How to Fix the DTC B1740?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1740 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.

Need more information about the B1740 code?

Need more information on how to fix the B1740 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1740 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1740 Buick — Driver Seat Front Down Switch Circuit
B1740 Cadillac — Driver Seat Front Down Switch Circuit
B1740 Chevrolet — Driver Seat Front Down Switch Circuit
B1740 GMC — Driver Seat Front Down Switch Circuit

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 B1740 Code

1. What are the common symptoms of OBDII code B1740 (Driver Seat Front Down Switch Circuit)?

The common symptoms include the driver seat front down switch being unresponsive or malfunctioning, preventing adjustment of the seat position.

2. What can cause OBDII code B1740 to trigger?

The code B1740 is typically triggered by a fault in the driver seat front down switch circuit, which may be due to a damaged switch, wiring issue, or a faulty control module.

3. How can I diagnose the cause of OBDII code B1740?

To diagnose the issue, you can start by inspecting the driver seat front down switch, checking the wiring connections, and using a multimeter to test for continuity and proper voltage in the circuit.

4. Can a DIYer repair OBDII code B1740 at home?

Depending on your skill level and access to tools, you may be able to repair OBDII code B1740 at home by replacing the faulty switch, repairing damaged wiring, or resetting the control module.

5. Are there any temporary fixes for OBDII code B1740?

While it's important to properly diagnose and repair the underlying issue causing the code, you may temporarily alleviate the symptoms by manually adjusting the driver seat to a comfortable position.

6. Will OBDII code B1740 prevent my vehicle from passing an emissions test?

OBDII code B1740 is related to the driver seat front down switch circuit and is not directly emissions-related. However, it should still be addressed to ensure proper functionality of the seat adjustment system.

7. How much does it typically cost to repair OBDII code B1740 at a repair shop?

The cost of repairing OBDII code B1740 can vary depending on the cause of the issue, the labor rates of the repair shop, and the price of any necessary parts. It's best to obtain a few quotes for an accurate estimate.

8. Can OBDII code B1740 affect the safety of driving the vehicle?

While OBDII code B1740 is not a critical safety issue, a malfunctioning driver seat front down switch can impact the driver's comfort and ability to adjust their seating position, potentially affecting driving ergonomics.

9. Is it possible for OBDII code B1740 to reoccur after being repaired?

If the root cause of the issue is not properly addressed during the repair, OBDII code B1740 may reoccur. It's essential to thoroughly diagnose and fix the problem to prevent future occurrences.

10. How urgent is it to address OBDII code B1740 once it has been detected?

While OBDII code B1740 does not pose an immediate threat to the vehicle's drivability or safety, it is advisable to address the issue in a timely manner to restore the proper functioning of the driver seat adjustment system.