AutoCodes – GMC – B3722 GMC

B3722 GMC 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 GMC 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 478

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

What does this mean?

What are the Possible Causes of the DTC B3722 GMC?

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 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 B3722 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 B3722 GMC 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 B3722 GMC Code

1. What are the common symptoms of OBDII code B3722 GMC (Rear Wiper Relay Drive Circuit Low)?

The common symptoms include the rear wiper not functioning or operating erratically.

2. What are the possible causes of OBDII code B3722 GMC?

Possible causes include a faulty rear wiper relay, damaged wiring or connectors in the rear wiper circuit, or a malfunctioning rear wiper motor.

3. How can I diagnose the issue related to code B3722 GMC?

You can start by checking the rear wiper relay, inspecting the wiring and connectors in the rear wiper circuit, and testing the rear wiper motor for functionality.

4. Is it safe to continue driving with OBDII code B3722 GMC active?

It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure the rear wiper functions properly when needed.

5. Can I repair OBDII code B3722 GMC on my own?

If you have experience with automotive electrical systems, you may be able to diagnose and repair this issue on your own by following a repair manual or seeking assistance from a professional if needed.

6. Are there any simple fixes I can try before seeking professional help for code B3722 GMC?

You can start by checking and ensuring the rear wiper fuse is intact, examining the rear wiper relay for any visible damage, and inspecting the wiring for any signs of wear or corrosion.

7. Will resetting the OBDII system clear code B3722 GMC?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear.

8. What are the potential repair costs associated with resolving OBDII code B3722 GMC?

The repair costs can vary depending on the exact cause of the issue, but they may involve replacing the rear wiper relay, repairing damaged wiring, or replacing the rear wiper motor.

9. Can extreme weather conditions contribute to triggering code B3722 GMC?

Extreme weather conditions can potentially affect the rear wiper system and contribute to issues that trigger this code, such as water damage or electrical malfunctions.

10. How can I prevent OBDII code B3722 GMC from occurring in the future?

Regularly inspecting and maintaining the rear wiper system, addressing any issues promptly, and keeping the system clean and free of debris can help prevent this code from occurring.