AutoCodes – Buick – B3718 Buick

B3718 Buick Code - Front Wiper Relay Drive Circuit High

Quick Answer

The Body Control Module (BCM) monitors the control circuit of the wiper relay. Common causes include Faulty Front Wiper Relay, Front Wiper Relay harness is open or shorted, Front 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: B3718 Buick indicates Front Wiper Relay Drive Circuit High.
Common causes: Common causes include Faulty Front Wiper Relay, Front Wiper Relay harness is open or shorted, Front 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 444

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 Mar 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3718 Buick Description

The Body Control Module (BCM) monitors the control circuit of the wiper relay. The voltage level should be low while the wiper relay is de-energized and near system voltage when the relay is energized. After the BCM receives a low, intermittent, or mist signal from the wiper/washer switch, it responds by applying battery voltage through the wiper relay control circuit to the coil side of the relay, energizing the wiper relay. The Diagnostic Trouble Code (DTC) sets if the BCM detects a short to battery voltage in the wiper relay control circuit.

OBDII Code B3718 Buick - Front Wiper Relay Drive Circuit High - AutoCodes.com — B3718 Buick Code - Front Wiper Relay Drive Circuit High

What does this mean?

What are the Possible Causes of the DTC B3718 Buick?

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

How to Fix the DTC B3718 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 B3718 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 B3718 Buick Code

1. What does the OBDII code B3718 mean on a Buick?

The B3718 code indicates a problem with the Front Wiper Relay Drive Circuit, specifically a high voltage issue.

2. What are the common symptoms of B3718 on a Buick?

Symptoms may include non-functional or erratic windshield wipers, wipers stuck in one position, or intermittent operation.

3. What causes the B3718 code to appear on a Buick?

Common causes include a faulty wiper relay, damaged wiring or connectors in the wiper circuit, or a malfunctioning body control module (BCM).

4. Can I drive my Buick with the B3718 code?

While it may be safe to drive, itâ€™s not recommended if wipers are non-functional, as visibility in adverse weather can be severely compromised.

5. How is the B3718 code diagnosed on a Buick?

A technician will inspect the front wiper relay, check for damaged wiring or connectors, and use a scan tool to test the BCM and wiper system.

6. How do I fix the B3718 code on my Buick?

Repairs may include replacing the faulty wiper relay, repairing damaged wiring, or reprogramming or replacing the BCM if necessary.

7. How much does it cost to fix the B3718 code on a Buick?

Repair costs can vary but typically range from $100 to $300, depending on the root cause and labor rates.

8. Can a bad wiper motor cause the B3718 code on a Buick?

While rare, a malfunctioning wiper motor can sometimes contribute to the issue if it creates abnormal electrical resistance.

9. Will clearing the B3718 code fix the issue permanently?

Clearing the code may temporarily reset the system, but the underlying issue must be addressed to prevent the code from returning.

10. Can I fix the B3718 code on my Buick myself?

If youâ€™re comfortable with basic electrical diagnostics, you can check the relay and wiring. However, more complex issues like BCM faults may require professional help.