AutoCodes – Buick – B1820 Buick

B1820 Buick Code - Driver Seat Recline Rearward 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: B1820 Buick indicates Driver Seat Recline Rearward 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 851

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 B1820 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 B1820 Buick - Driver Seat Recline Rearward Switch Circuit - AutoCodes.com — B1820 Buick Code - Driver Seat Recline Rearward Switch Circuit

What does this mean?

What are the Possible Causes of the DTC B1820 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 B1820 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 B1820 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 B1820 Buick Code

1. What are the common symptoms of OBDII code B1820 in a Buick related to the Driver Seat Recline Rearward Switch Circuit?

- Common symptoms include the inability to adjust the driver seat recline rearward, a malfunctioning seat recline switch, or erratic seat movement.

2. What is the likely cause of OBDII code B1820 in a Buick?

- The most common cause of this code is a fault in the driver seat recline rearward switch circuit, such as a wiring issue, damaged switch, or faulty control module.

3. How can I diagnose the issue related to OBDII code B1820 in my Buick?

- To diagnose the problem, you can start by checking the wiring connections, inspecting the recline rearward switch for any damage, and using a diagnostic scanner to read the trouble codes.

4. Is it safe to drive my Buick with OBDII code B1820 related to the Driver Seat Recline Rearward Switch Circuit?

- While it may be safe to drive, it is recommended to address the issue promptly to avoid any inconvenience or discomfort caused by the malfunctioning seat adjustment.

5. Can I repair OBDII code B1820 in my Buick by myself?

- Depending on your skills and experience, you may be able to repair this issue yourself by following the diagnostic steps, replacing the faulty components, and clearing the trouble codes.

6. How much does it typically cost to fix OBDII code B1820 in a Buick at a repair shop?

- The cost of fixing this issue can vary depending on the extent of the problem, parts needed for replacement, and labor charges. It is advisable to get a quote from a trusted repair shop.

7. Are there any temporary solutions to address OBDII code B1820 in my Buick until I can get it repaired?

- While temporary solutions may vary, you could try manually adjusting the seat position, avoiding using the malfunctioning switch, or disconnecting the power to the seat to prevent further issues.

8. Will OBDII code B1820 cause any other problems in my Buick if left unaddressed?

- Leaving this issue unresolved could lead to further damage to the seat adjustment system, potential safety concerns, and inconvenience while driving.

9. How long does it typically take to repair OBDII code B1820 related to the Driver Seat Recline Rearward Switch Circuit in a Buick?

- The repair time can vary depending on the exact cause of the issue, availability of parts, and the expertise of the technician. It may take a few hours to a full day to complete the repair.

10. Can OBDII code B1820 in a Buick be triggered by other underlying issues besides the Driver Seat Recline Rearward Switch Circuit?

- While the code is primarily related to the seat recline rearward switch circuit, it is possible for other electrical or wiring problems in the vehicle to trigger this code.