B252C
DTC B252C
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 B252C 00
- Child Security Lock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the voltage level in the child security door lockout switch signal circuit, when the switch is in the open position the voltage in the signal circuit will be equal to the B+ voltage level. When the child security door lockout switch is pressed, voltage within the signal circuit drops and the BCM will detect the voltage drop and will energize the Door Lock relay to disable the interior rear door handles.
Conditions for Running the DTC
The system voltage is 9-16 V.
Conditions for Setting the DTC
The BCM has detected a short to ground on the child security lockout switch signal circuit for greater than 60 seconds.
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 ignore the input from the lockout switch.
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
* 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
1. Ignition ON.
2. Verify the scan tool Left Rear Child Security Lock Switch and Right Rear Child Security Lock Switch parameters change between Inactive and Active when pressing and depressing the child security lockout switch.
• If the parameters do not change
Refer to Circuit/System Testing.
• If the parameters change
3. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48E multifunction switch-center console. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 9 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 9
4. Verify the scan tool Left Rear Child Security Lock Switch and Right Rear Child Security Lock Switch parameters changes to Active from Inactive.
• If the parameter does not change
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal 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 parameter changes
5. Test or replace the S48E multifunction switch-center console.
Component Testing
1. Ignition OFF, disconnect the harness connector at the S48E multifunction switch-center console.
2. Test for infinite resistance between the signal terminal 7 and the ground terminal 9 with the switch in the open position.
• If less than infinite resistance
Replace the S48E multifunction switch-center console.
• If infinite resistance
3. Test for less than 3 ohms between the signal terminal 7 and the ground terminal 9 with the switch in the closed position.
• If 3 ohms or greater
Replace the S48E multifunction switch-center console.
• If less than 3 ohms
4. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Floor Console Multifunction Switch Replacement Front Floor Console Multifunction Switch Replacement
* Control Module References Control Module References for the BCM replacement, programming and setup