AutoCodes – Generic – B3722

B3722 Code - Rear Wiper Relay Drive Circuit Low

Quick Answer

When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper switch signal input of the Body Control Module (BCM) circuit. Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear 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: B3722 indicates Rear Wiper Relay Drive Circuit Low.
Common causes: Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear 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 704

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 B3722 Description

When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper switch signal input of the Body Control Module (BCM) circuit. The BCM responds by switching the rear wiper relay control circuit to ground. This action energizes the rear wiper relay, providing power to the rear wiper motor. The Diagnostic Trouble Code (DTC) sets when the rear wiper relay control circuit is shorted to ground or open.

OBDII Code B3722 - Rear Wiper Relay Drive Circuit Low - AutoCodes.com — B3722 Code - Rear Wiper Relay Drive Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3722?

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

How to Fix the DTC B3722?

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 B3722 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 B3722 code?

Need more information on how to fix the B3722 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3722 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3722 Buick — Rear Wiper Relay Drive Circuit Low
B3722 Cadillac — Rear Wiper Relay Drive Circuit Low
B3722 Chevrolet — Rear Wiper Relay Drive Circuit Low
B3722 GMC — Rear Wiper Relay Drive Circuit Low
B3722 Pontiac — Rear Wiper Relay Drive Circuit Low
B3722 Saturn — Rear Wiper Relay Drive Circuit Low

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 B3722 Code

1. What does the OBDII code B3722 mean?

B3722 indicates a problem with the rear wiper relay drive circuit, specifically a low voltage or malfunction that prevents the rear wiper from operating as intended.

2. What are the common symptoms of code B3722?

Symptoms include the rear wiper failing to operate, intermittent rear wiper function, or the rear wiper staying stuck in one position.

3. What causes code B3722 to appear?

Common causes include a faulty rear wiper relay, damaged wiring or connectors, a blown fuse, or issues with the rear wiper motor.

4. Can I drive my vehicle with code B3722?

Yes, you can drive the vehicle, but the rear wiper may not function properly, which could impact visibility in rainy or snowy conditions.

5. How do I diagnose code B3722?

Start by inspecting the rear wiper relay, checking the wiring and connectors for damage, and testing the voltage at the rear wiper motor to ensure proper power delivery.

6. How do I fix code B3722?

Repairs may include replacing a faulty rear wiper relay, repairing damaged wiring, replacing the rear wiper motor, or replacing a blown fuse.

7. How much does it cost to repair code B3722?

The cost depends on the specific repair needed. Replacing a rear wiper relay typically costs $20-$50, while a rear wiper motor replacement may cost $200-$400.

8. Can code B3722 be caused by water damage?

Yes, water damage to the wiring or connectors in the rear wiper system can cause this code by creating shorts or corrosion.

9. Will clearing the code fix B3722?

Clearing the code without addressing the underlying issue will not fix the problem. The code will likely return until the fault is repaired.

10. Do I need a mechanic to fix code B3722?

If you're comfortable with electrical troubleshooting, you may be able to fix it yourself. Otherwise, a mechanic can diagnose and repair the issue efficiently.