AutoCodes – Chevrolet – B1845 Chevrolet

B1845 Chevrolet 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 Chevrolet 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 395

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1845 Chevrolet 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 Chevrolet - Driver Seat Lumbar Down Switch Circuit - AutoCodes.com — B1845 Chevrolet Code - Driver Seat Lumbar Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1845 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 B1845 Chevrolet code?

Need more information on how to fix the B1845 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1845 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

B1845 2014 Chevrolet Silverado — Driver Seat Lumbar Down Switch Circuit
B1845 2015 Chevrolet Silverado — Driver Seat Lumbar Down Switch Circuit
B1845 2016 Chevrolet Silverado — Driver Seat Lumbar Down Switch Circuit
B1845 2017 Chevrolet Silverado — Driver Seat Lumbar Down Switch Circuit
B1845 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What does the OBDII code B1845 mean on a Chevrolet?

The B1845 code indicates a problem with the driver seat lumbar down switch circuit, which controls the lumbar support adjustment in the seat.

2. What are common symptoms of the B1845 code?

Symptoms include the lumbar support not moving down when the switch is pressed, complete failure of lumbar adjustment, or intermittent operation.

3. What causes the B1845 code to appear?

The code is typically triggered by a faulty lumbar down switch, damaged wiring or connectors in the circuit, or a malfunctioning seat control module.

4. Can a blown fuse cause the B1845 code?

Yes, a blown fuse in the seat adjustment circuit can lead to the code being stored, as it disrupts power to the lumbar switch.

5. How do I diagnose the B1845 code?

Start by inspecting the lumbar switch, wiring, and connectors for damage or corrosion. Use a multimeter to check for continuity and proper voltage in the circuit.

6. Can I still adjust the lumbar support with the B1845 code?

If the issue is isolated to the "down" function of the lumbar switch, other adjustments may still work, but full functionality may be impaired.

7. How do I fix the B1845 code?

Repairs may include replacing the lumbar down switch, repairing or replacing damaged wiring, or reprogramming or replacing the seat control module if necessary.

8. Is the B1845 code a serious issue?

While it doesnâ€™t affect vehicle safety or drivability, it can be inconvenient and should be addressed to restore full seat adjustment functionality.

9. How much does it cost to repair the B1845 code?

The cost depends on the root cause, but replacing the lumbar switch typically costs $50â€“$150, while more extensive wiring or module repairs can be higher.

10. Can I clear the B1845 code without fixing the problem?

Clearing the code without addressing the issue may temporarily remove it, but itâ€™s likely to return if the underlying problem isnâ€™t resolved.