AutoCodes – GMC – B1845 GMC

B1845 GMC Code - Driver Seat Lumbar 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: B1845 GMC indicates Driver Seat Lumbar 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 365

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 24, 2023

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B1845 GMC 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 B1845 GMC - Driver Seat Lumbar Down Switch Circuit - AutoCodes.com — B1845 GMC Code - Driver Seat Lumbar Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1845 GMC?

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 B1845 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1845 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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Information for Specific GMC Models

B1845 2014 GMC Sierra — Driver Seat Lumbar Down Switch Circuit
B1845 2015 GMC Sierra — Driver Seat Lumbar Down Switch Circuit
B1845 2016 GMC Sierra — Driver Seat Lumbar Down Switch Circuit
B1845 2017 GMC Sierra — Driver Seat Lumbar Down Switch Circuit
B1845 2018 GMC Sierra — Driver Seat Lumbar 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 B1845 GMC Code

1. What are the common symptoms of OBDII code B1845 GMC related to the Driver Seat Lumbar Down Switch Circuit?

- The common symptoms include the driver seat lumbar down switch not functioning properly or not responding at all.

2. What are the possible causes of OBDII code B1845 GMC?

- The code B1845 GMC is typically caused by a faulty driver seat lumbar down switch, wiring issues, or a malfunctioning control module.

3. How can I diagnose the issue causing OBDII code B1845 GMC?

- Diagnose the issue by checking the wiring connections to the driver seat lumbar down switch, testing the switch for continuity, and scanning the vehicle for other related trouble codes.

4. Can I repair OBDII code B1845 GMC on my own?

- If you have experience with automotive electrical systems, you can attempt to repair the issue by replacing the faulty switch, repairing damaged wiring, or resetting the control module.

5. Is it safe to continue driving with OBDII code B1845 GMC present?

- It is generally safe to continue driving with this code, but you may experience inconvenience due to the driver seat lumbar down switch not working.

6. How much does it typically cost to repair OBDII code B1845 GMC?

- The cost of repairing OBDII code B1845 GMC can vary depending on the underlying issue, but it may range from $50 to $200 for parts and labor.

7. Can a faulty driver seat lumbar down switch cause other issues in the vehicle?

- A faulty driver seat lumbar down switch may not directly cause other issues, but it can affect the comfort and convenience of the driver while operating the vehicle.

8. Will resetting the vehicle's computer system clear OBDII code B1845 GMC?

- Resetting the vehicle's computer system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return.

9. Are there any preventive measures to avoid OBDII code B1845 GMC in the future?

- Regularly inspecting and maintaining the driver seat lumbar down switch and its wiring can help prevent OBDII code B1845 GMC from occurring.

10. How long does it typically take to repair OBDII code B1845 GMC?

- The repair time for OBDII code B1845 GMC can vary depending on the complexity of the issue, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.