B3930
DTC B3930
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B3930 01
- Child Security Lock Motors Circuit Short to Battery
DTC B3930 02
- Child Security Lock Motors Circuit Short to Ground
DTC B3930 04
- Child Security Lock Motors Circuit Open
Diagnostic Fault Information
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 rear door handles.
Conditions for Running the DTC
When the Door Lock relay is being actively commanded by the BCM.
Conditions for Setting the DTC
B3930 01
The BCM detects a short to voltage or an open/high resistance in the door lock security relay control circuit.
The BCM detects a an open/high resistance in the underhood fuse block ground circuit.
The BCM detects a short to ground or an open/high resistance in the BCM B+ circuit.
B3930 02
The BCM detects a short to ground in the door lock security relay control circuit.
B3930 04
The BCM detects a short to voltage or an open/high resistance in the door lock security relay control circuit.
The BCM detects a an open/high resistance in the underhood fuse block ground circuit.
The BCM detects a short to ground or an open/high resistance in the BCM B+ circuit.
Action Taken When the DTC Sets
* The interior rear door handles will always be disabled or will not lockout depending upon the latch states when the fault occurred
* The BCM will command the lockout indicator to flash ON and OFF for 30 seconds when the lockout switch is pressed to indicate a fault in the system.
Conditions for Clearing the DTC
* The 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 Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Circuit Testing Circuit Testing
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the operation of both interior rear door handles do not open the rear doors when commanding the Child Security Lock Motors ON with a scan tool.
• If both interior door handles open the rear doors
Refer to Circuit/System Testing.
• If both interior door handles do not open the rear doors
3. Verify the operation of both interior rear door handles will open the rear doors when commanding the Child Security Lock Motors OFF with a scan tool.
• If both interior door handles do not open the rear doors
Refer to Circuit/System Testing.
• If both interior door handles open the rear doors
4. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the X50A fuse block-underhood.
2. Connect a test lamp between the control circuit terminal D5 and ground, ignition ON.
3. Verify the test lamp turns ON and OFF when commanding the Child Security Lock Motors ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
4. Replace the X50A fuse block-underhood.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Compartment Fuse Block Replacement Service and Repair
* Control Module References Control Module References BCM replacement, programming and setup