AutoCodes – Chevrolet – B370B Chevrolet

B370B Chevrolet Code - Rear Wiper Function Control Circuit Short to Ground

Quick Answer

The Body Control Module (BCM) controls the rear wiper motor based on an input from the rear wiper switch, which is part of the turn signal/multifunction switch. Common causes include Faulty Rear Window Wiper Motor, Rear Window Wiper Motor harness is open or shorted, Rear Window Wiper Motor 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: B370B Chevrolet indicates Rear Wiper Function Control Circuit Short to Ground.
Common causes: Common causes include Faulty Rear Window Wiper Motor, Rear Window Wiper Motor harness is open or shorted, Rear Window Wiper Motor 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 639

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 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B370B Chevrolet Description

The Body Control Module (BCM) controls the rear wiper motor based on an input from the rear wiper switch, which is part of the turn signal/multifunction switch. The rear wiper switch uses a resistor ladder to determine low speed, intermittent, and rear washer operation. A constant B+ and ground are supplied to the rear wiper motor. When rear wiper operation is requested, the BCM sends serial data messages. When the rear wiper switch is placed in the low speed, intermittent, or rear washer position, the voltage is pulled down through a different resistor in the resistor ladder, reducing the voltage seen at the BCM. The BCM will respond by commanding the specific rear wiper function.
The BCM monitors the liftgate ajar signal circuit, and the BCM will disable the function of the rear wiper motor if the liftgate of liftglass is ajar or open.
The Diagnostic Trouble Code (DTC) sets when a short to voltage, short to ground or open or high resistance is detected in the rear wiper relay control circuit.

OBDII Code B370B Chevrolet - Rear Wiper Function Control Circuit Short to Ground - AutoCodes.com — B370B Chevrolet Code - Rear Wiper Function Control Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B370B Chevrolet?

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

How to Fix the DTC B370B Chevrolet?

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 B370B Chevrolet 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 B370B Chevrolet Code

1. What are common symptoms of OBDII code B370B Chevrolet (Rear Wiper Function Control Circuit Short to Ground)?

The common symptoms include the rear wiper not working at all or operating erratically, and a warning light on the dashboard indicating a fault.

2. What causes the OBDII code B370B Chevrolet to trigger?

This code is typically triggered by a short circuit to ground in the rear wiper function control circuit, which can be caused by damaged wiring, a faulty wiper motor, or a malfunctioning control module.

3. How can I diagnose the issue associated with code B370B Chevrolet?

To diagnose the issue, you can perform a visual inspection of the wiring harness and connectors, test the rear wiper motor for proper functionality, and use a multimeter to check for continuity and shorts in the circuit.

4. Can I still drive my vehicle with OBDII code B370B Chevrolet active?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the rear wiper system, especially in inclement weather.

5. What are the repair options for OBDII code B370B Chevrolet?

Repair options include repairing or replacing damaged wiring, replacing the rear wiper motor if faulty, and potentially replacing the control module if necessary.

6. Should I reset the OBDII code B370B Chevrolet after making repairs?

Yes, it is important to reset the code using an OBDII scanner after making repairs to clear the fault code and ensure that the issue has been resolved.

7. Is it possible to prevent OBDII code B370B Chevrolet from occurring in the future?

While some causes of this code may be unavoidable, you can help prevent it by ensuring proper maintenance of the rear wiper system and promptly addressing any issues with wiring or components.

8. How long does it typically take to repair OBDII code B370B Chevrolet?

The repair time can vary depending on the exact cause of the code and the extent of the repairs needed. It can range from a quick fix to a more involved repair requiring additional troubleshooting.

9. Can a DIY enthusiast fix OBDII code B370B Chevrolet, or should it be done by a professional?

Depending on your skill level and knowledge of automotive repairs, a DIY enthusiast may be able to fix this code. However, if you are unsure or inexperienced, it is recommended to seek the assistance of a professional mechanic.

10. Are there any recalls or technical service bulletins related to OBDII code B370B Chevrolet?

It is advisable to check with the manufacturer or a trusted automotive source for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or solutions provided by the manufacturer.