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DTC B3930

DTC B3930

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions has overviews of all diagnostic categories.


DTC Descriptor

DTC B3930 02

Child Security Lock Motors Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Door Lock Security Relay Control

B3930 02

1

1

-

Door Lock Security Relay Ground

1

1

-

-

1. Child Security Door Lock Malfunction



Circuit/System 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.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The DTC will set when the BCM detects a short to ground in the child security lock motors circuit.

Action Taken When the DTC Sets

The power door locks will be inoperative.

Conditions for Clearing the DTC


• This DTC will be current for as long as the fault is present.

• When the fault is no longer present, the DTC will be a history DTC.

• A history DTC will clear after 50 ignition cycles.


Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for information on diagnostic tools

Circuit/System Verification

Command the child locks to lockout with the child lock switch, the rear doors handles should disable.

Circuit/System Testing


1. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.

2. Test for greater than 50 Ω between the control circuit terminal 16 X5 and ground.

3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the child security lock relay.

4. If all circuits test normal, replace the K9 Body Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Underhood Electrical Center or Junction Block Replacement

• Control Module References for information on BCM replacement, setup, and programming