PRE-RELEASE
DTC B3930
| DTC B3930 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
has overviews of all diagnostic categories.
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| 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 |
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Door Lock Security Relay Control
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B3930 02
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1
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1
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-
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Door Lock Security Relay Ground
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1
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1
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-
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-
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1. Child Security Door Lock Malfunction
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| 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 |
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This DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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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.
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| 2. |
Test for greater than 50 Ω between the control circuit terminal 16 X5 and ground.
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| 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.
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| 4. |
If all circuits test normal, replace the K9 Body Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Underhood Electrical Center or Junction Block Replacement
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Control Module References
for information on BCM replacement, setup, and programming
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