AutoCodes – GMC – B3718 GMC

B3718 GMC 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 GMC 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 869

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

What does this mean?

What are the Possible Causes of the DTC B3718 GMC?

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 GMC?

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 GMC 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.

Need more information about the B3718 GMC code?

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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 GMC Code

1. What are the common symptoms of OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

The common symptoms include constant or intermittent operation of the front wipers, wipers not turning off, and potential issues with other electrical components.

2. What are the possible causes of OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

Possible causes include a faulty front wiper relay, damaged wiring or connectors in the wiper circuit, or a problem with the wiper motor itself.

3. How can I diagnose the Front Wiper Relay Drive Circuit High issue?

Diagnosis typically involves using a scan tool to read the OBDII code, inspecting the front wiper relay and related components, and testing the wiring and connectors for any faults.

4. Can I still drive my vehicle with OBDII code B3718 GMC active?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential wiper malfunction during inclement weather.

5. How can I repair OBDII code B3718 GMC (Front Wiper Relay Drive Circuit High)?

Repair options may include replacing the front wiper relay, repairing or replacing damaged wiring or connectors, or addressing any issues with the wiper motor.

6. Are there any DIY tips for fixing OBDII code B3718 GMC?

DIY enthusiasts with automotive repair experience may attempt to replace the front wiper relay themselves, following the vehicle's service manual or online guides.

7. Can extreme weather conditions cause OBDII code B3718 GMC to trigger?

Yes, extreme weather conditions such as heavy rain, snow, or ice can potentially exacerbate existing issues with the front wiper relay drive circuit, leading to the code being triggered.

8. How long does it typically take to repair OBDII code B3718 GMC?

The repair time can vary depending on the exact cause of the issue and the repair process involved, but it can generally be completed within a few hours to a day.

9. Will resetting the OBDII code B3718 GMC clear the issue permanently?

Resetting the code may temporarily clear it, but if the underlying issue with the front wiper relay drive circuit is not addressed, the code is likely to reappear.

10. Is it recommended to seek professional help for OBDII code B3718 GMC repair?

If you are not confident in diagnosing or repairing electrical issues in your vehicle, it is advisable to seek professional help from a certified mechanic or auto repair shop to ensure the problem is properly resolved.