AutoCodes – Buick – B3875 Buick

B3875 Buick Code - Windshield Wiper High Speed Relay Circuit

Quick Answer

The windshield wiper motor is controlled by the Body Control Module (BCM) through the windshield wiper replay and the windshield wiper speed control relay. Common causes include Faulty Windshield Wiper Relay, Windshield Wiper Relay harness is open or shorted, Windshield Wiper Relay 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: B3875 Buick indicates Windshield Wiper High Speed Relay Circuit.
Common causes: Common causes include Faulty Windshield Wiper Relay, Windshield Wiper Relay harness is open or shorted, Windshield Wiper Relay 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 837

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 Jun 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3875 Buick Description

The windshield wiper motor is controlled by the Body Control Module (BCM) through the windshield wiper replay and the windshield wiper speed control relay. When low-speed windshield wiper operation is requested, the BCM will apply voltage to the windshield wiper relay control circuit. This will cause the contacts in the windshield wiper relay to close and apply B+ to the windshield wiper motor through the windshield wiper low-speed control circuit, enabling low-speed wiper operation. When high-speed windshield wiper operation is requested, the body control module continues to apply voltage to the windshield wiper relay control circuit and also applies ground to the windshield wiper speed control relay control circuit. This will cause the contacts in the windshield wiper speed control relay to close and apply B+ to the windshield wiper motor through the windshield wiper high-speed control circuit, enabling high-speed wiper operation. When the windshield wiper request is no longer present, the contacts in the windshield wiper relay and windshield wiper speed control relay will open, removing B+ from the wiper motor control circuits. The windshield wiper motor will continue to operate using a discrete B+ circuit provided by the BCM until the wipers are in the park position.

OBDII Code B3875 Buick - Windshield Wiper High Speed Relay Circuit - AutoCodes.com — B3875 Buick Code - Windshield Wiper High Speed Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B3875 Buick?

Faulty Windshield Wiper Relay
Windshield Wiper Relay harness is open or shorted
Windshield Wiper Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3875 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 B3875 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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Need Help with the Code?

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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 B3875 Buick Code

1. What does the OBDII code B3875 mean on a Buick?

The B3875 code refers to a malfunction in the windshield wiper high-speed relay circuit, indicating an electrical issue in the system.

2. What are the symptoms of the B3875 code on a Buick?

Symptoms may include windshield wipers not working at high speed, intermittent wiper operation, or wipers stopping mid-cycle.

3. What causes the B3875 code to appear on a Buick?

Common causes include a faulty high-speed wiper relay, damaged wiring or connectors in the wiper circuit, or a malfunctioning windshield wiper motor.

4. Can I still drive my Buick with the B3875 code?

Yes, but it is not recommended during adverse weather conditions as limited wiper functionality can reduce visibility and compromise safety.

5. How do I diagnose the B3875 code on a Buick?

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

6. How can I fix the B3875 code on my Buick?

Repairs may include replacing the high-speed wiper relay, repairing or replacing damaged wiring or connectors, or replacing the windshield wiper motor if it is faulty.

7. What tools are needed to repair the B3875 code on a Buick?

You may need a multimeter, basic hand tools, replacement parts (relay, wiring, or motor), and possibly a scan tool to clear the code.

8. How much does it cost to repair the B3875 code on a Buick?

Repair costs vary depending on the issue, but replacing a wiper relay typically costs $50â€“$150, while replacing a wiper motor can range from $200â€“$400, including labor.

9. Can a blown fuse cause the B3875 code on a Buick?

While rare, a blown fuse in the wiper circuit can contribute to the issue, so itâ€™s worth checking the fuse box during diagnosis.

10. Will clearing the B3875 code fix the problem on my Buick?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return. Proper diagnosis and repair are necessary.