AutoCodes – Generic – B3930:02

B3930:02 Code - Child Security Lock Motors Circuit Short to Ground

Quick Answer

The Body Control Module (BCM) controls the Child Security Lock Relay when it receives a command to lockout the rear doors. Common causes include Faulty Child Security Lock Relay, Child Security Lock Relay harness is open or shorted, Child Security Lock 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: B3930:02 indicates Child Security Lock Motors Circuit Short to Ground.
Common causes: Common causes include Faulty Child Security Lock Relay, Child Security Lock Relay harness is open or shorted, Child Security Lock 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 180

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 Jun 17, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3930:02 Description

The Body Control Module (BCM) controls the Child Security Lock Relay when it receives a command to lockout the rear doors. The relay will apply voltage to both child security circuits at the rear door latches to disable the interior door handles. The Diagnostic Trouble Code (DTC) sets when the BCM detects a short to ground on the child security lock disable relay control circuit.

OBDII Code B3930:02 - Child Security Lock Motors Circuit Short to Ground - AutoCodes.com — B3930:02 Code - Child Security Lock Motors Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B3930:02?

Faulty Child Security Lock Relay
Child Security Lock Relay harness is open or shorted
Child Security Lock Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3930:02?

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 B3930:02 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 B3930:02 Code

1. What does OBDII code B3930:02 mean?

Code B3930:02 indicates a short-to-ground issue in the child security lock motors circuit, which controls the electronic child safety locks on the vehicle's doors.

2. What are the common symptoms of code B3930:02?

Symptoms include child safety locks not engaging or disengaging, warning lights on the dashboard, or unresponsive door lock controls.

3. What causes code B3930:02 to trigger?

This code is typically caused by damaged wiring, a short to ground in the circuit, a faulty child lock motor, or a malfunctioning control module.

4. Can I still drive my car with code B3930:02?

Yes, but the child safety locks might not function properly, which could pose a safety risk for passengers, especially children.

5. How do I diagnose code B3930:02?

Start by inspecting the wiring and connectors for damage or corrosion, check the child lock motor for faults, and verify the circuit for continuity and shorts to ground.

6. How do I fix code B3930:02?

Repairs may include replacing damaged wiring, repairing the short to ground, replacing the faulty child lock motor, or reprogramming/replacing the control module.

7. What tools are needed to troubleshoot code B3930:02?

A digital multimeter, OBDII scanner, and wiring diagrams specific to your vehicle are essential for diagnosing this issue.

8. Can a blown fuse cause code B3930:02?

Yes, a blown fuse in the child lock circuit can cause this code, so inspecting the fuses should be part of the diagnostic process.

9. How much does it cost to fix code B3930:02?

Repair costs vary depending on the issue, but wiring repairs or motor replacements typically cost between $100 and $400, excluding labor.

10. Can I fix code B3930:02 myself?

If you have experience with automotive electrical systems and the necessary tools, you may be able to fix the issue. Otherwise, itâ€™s best to consult a professional.