AutoCodes – Cadillac – B1845 Cadillac

B1845 Cadillac 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 Cadillac 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 261

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

What does this mean?

What are the Possible Causes of the DTC B1845 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

The code B1845 indicates a problem in the Driver Seat Lumbar Down Switch Circuit, which controls the lumbar support adjustment in the driver's seat.

2. What are the symptoms of code B1845 on a Cadillac?

Symptoms may include the lumbar support not adjusting downward, a non-responsive lumbar control switch, or intermittent operation of the lumbar system.

3. What causes the B1845 code to appear?

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 Cadillac with code B1845 active?

Yes, the code does not affect drivability, but it may result in discomfort if the lumbar adjustment is stuck in an undesirable position.

5. How do I diagnose the B1845 code on my Cadillac?

Start by inspecting the lumbar switch for damage, checking the wiring and connectors for continuity or corrosion, and testing the seat control module.

6. How can the B1845 code be fixed on a Cadillac?

Repairs may involve replacing the lumbar down switch, repairing damaged wiring or connectors, or replacing the seat control module if itâ€™s faulty.

7. How much does it cost to fix the B1845 code?

Repair costs vary depending on the issue, ranging from $50 for minor wiring repairs to several hundred dollars for replacing the seat control module or lumbar switch.

8. Can I reset the B1845 code without repairing the issue?

You can clear the code with an OBDII scanner, but it will likely return unless the underlying problem is resolved.

9. Is the B1845 code specific to Cadillac vehicles?

While the code itself may appear on other makes, the exact definition and related systems are specific to Cadillac vehicles equipped with power lumbar adjustment.

10. Does the B1845 code require professional repair?

If you are experienced with electrical diagnostics and repairs, you can attempt to fix it yourself; otherwise, itâ€™s best to seek professional assistance.