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 Descriptor
DTC B3930 02
- Child Security Lock Motors Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The child door lockout switch is on the driver door lock/window switch and controls the child locks on the rear doors as well as the rear window switches. When the BCM receives a command from the window lockout switch, it will apply voltage to the door lock security relay coil, this will energize the relay and the contact within the relay will then direct the voltage to lock the left rear and right rear child locks and then isolate them from the normal door lock system to prevent the rear doors from being opened by using the interior rear door handles.
Conditions for Running the DTC
When the relay is being actively commanded by the BCM.
Conditions for Setting the DTC
The BCM detects a short to ground in the child security lock relay circuit.
Action Taken When the DTC Sets
The interior rear door will continue to function when commanded to lockout.
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 Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Ignition ON, with all the doors locked, command the child security lockout by pressing the window lockout switch on the driver door lock/window switch, the interior rear door handles should not open the doors when used.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 harness connector at the X50A fuse block-underhood.
2. Test for less than 10 ohm between the ground circuit terminal 71 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition OFF, connect the X1 harness connector and disconnect the X2 harness connector at the X50A fuse block-underhood.
4. Connect a test lamp between the control circuit terminal 13 and ground.
5. Ignition ON, command the child security lockout by pressing the window lockout switch on the S79D driver door lock/window switch. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
6. If all circuits test normal, replace the X50A fuse block-underhood.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuse Block Replacement Fuse Block Replacement
* Control Module References Control Module References for BCM replacement, setup and programming