AutoCodes – Buick – B1845 Buick

B1845 Buick 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 Buick 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 213

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
Cost to Diagnose
FAQs
Comments
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Code B1845 Buick 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 Buick - Driver Seat Lumbar Down Switch Circuit - AutoCodes.com — B1845 Buick Code - Driver Seat Lumbar Down Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1845 Buick?

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 Buick?

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 B1845 Buick 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 B1845 Buick Code

1. What does the OBDII code B1845 mean for a Buick?

B1845 indicates an issue with the driver seat lumbar down switch circuit, suggesting a malfunction in the electrical components controlling the lumbar adjustment.

2. What are the common symptoms of the B1845 code?

Symptoms include the lumbar support not moving down, intermittent or unresponsive lumbar adjustments, and possibly a warning light on the dashboard.

3. What causes the B1845 code to appear in a Buick?

Common causes include a faulty lumbar down switch, damaged wiring or connectors in the circuit, or a malfunctioning seat control module.

4. Can I still drive my Buick with the B1845 code active?

Yes, the vehicle is safe to drive, but the lumbar adjustment function may be inoperative or limited, potentially affecting seat comfort.

5. How do I troubleshoot the B1845 code?

Start by inspecting the lumbar down switch, checking for loose or damaged wiring, and testing the circuit for continuity using a multimeter.

6. Do I need to replace the lumbar down switch to fix the B1845 code?

Not necessarily. The issue could also stem from wiring problems or faults in the seat control module, so diagnose thoroughly before replacing parts.

7. How much does it cost to repair the B1845 code in a Buick?

Repair costs can vary, with switch replacements costing $50-$150 and labor adding $50-$100, depending on the issue's complexity.

8. Can a blown fuse cause the B1845 code?

While unlikely, itâ€™s worth checking the related fuses in the power seat circuit, as a blown fuse could disrupt seat functions.

9. Will clearing the B1845 code fix the problem?

Clearing the code may temporarily remove the warning, but the issue will likely return unless the underlying fault is resolved.

10. Should I take my Buick to a professional for the B1845 code?

If basic troubleshooting doesnâ€™t resolve the issue or youâ€™re unfamiliar with electrical repairs, consulting a professional mechanic is recommended.