AutoCodes – Buick – B3722 Buick

B3722 Buick 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 Buick 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 466

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

What does this mean?

What are the Possible Causes of the DTC B3722 Buick?

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 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 B3722 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 B3722 Buick Code

1. What does the OBDII code B3722 mean on a Buick?

The B3722 code indicates that the Rear Wiper Relay Drive Circuit is experiencing a low-voltage condition, typically due to an electrical fault.

2. What are the symptoms of a B3722 code on a Buick?

Common symptoms include the rear wiper not functioning, intermittent operation, or being stuck in one position.

3. What causes the B3722 Rear Wiper Relay Drive Circuit Low code?

Potential causes include a faulty rear wiper relay, damaged wiring or connectors, a defective rear wiper motor, or issues with the body control module (BCM).

4. Can a bad rear wiper motor trigger the B3722 code?

Yes, a malfunctioning rear wiper motor can cause the circuit to draw too much or too little current, triggering the code.

5. How do I diagnose the B3722 code on my Buick?

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

6. Can I still drive my Buick with the B3722 code?

Yes, the vehicle is still drivable, but the rear wiper may not function properly, which could affect visibility in rainy or snowy conditions.

7. How do I fix the B3722 code on a Buick?

Repairs may include replacing a faulty rear wiper relay, repairing damaged wiring, cleaning corroded connectors, or replacing the rear wiper motor if needed.

8. Does the B3722 code require reprogramming the BCM?

In most cases, reprogramming the BCM is not necessary, but if the BCM itself is faulty, it may need to be replaced and reprogrammed.

9. Is the B3722 code specific to Buick vehicles?

While the code can appear on other vehicles, its interpretation as the Rear Wiper Relay Drive Circuit Low is specific to GM vehicles, including Buick.

10. How much does it typically cost to repair the B3722 code?

Repair costs can range from $50 to $300, depending on whether the issue involves simple wiring repairs or the replacement of components like the rear wiper motor or relay.