Power Door Lock Key Cylinder Switches Malfunction
Power Door Lock Key Cylinder Switches Malfunction
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 B2500 00
- Driver Exterior Unlock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The driver window switch monitors the voltage level of the key switch unlock signal circuit. When the key is inserted into the driver door key cylinder and turned to the Unlock position, a switch within the driver door latch closes causing the voltage to drop within the key switch unlock signal circuit. The driver window switch will detect the drop in voltage and will send a serial data message to the BCM commanding all the doors to unlock.
Conditions for Running the DTC
* The ignition is ON.
* The system voltage is 9-16 V.
Conditions for Setting the DTC
The BCM detects a short to ground on the driver door key switch signal circuit.
Action Taken When the DTC Sets
The BCM will ignore the unlock command from the key cylinder switch.
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 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 Driver Door Key Unlock Switch parameter changes between Inactive and Active when inserting the key into the door lock key cylinder and turning the key to the unlock position.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
3. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the A23D Door Latch Assembly-Driver. 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 3 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. Ignition ON.
4. Verify the scan tool Driver Door Key Unlock Switch parameter is Inactive.
• If not Inactive
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
2. Test for infinite resistance between the signal circuit terminal 5 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D Window Switch-Driver.
• If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 3.
6. Verify the scan tool Driver Door Key Unlock Switch parameter is Active.
• If not Active
1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver, 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 S79D Window Switch-Driver.
• If Active
7. Test or replace the A23D Door Latch Assembly-Driver.
Component Testing
1. Ignition OFF, disconnect the harness connector at the A23D Door Latch Assembly-Driver.
2. Test for infinite resistance between the signal terminal 5 and the ground terminal 3 with the switch in the open position.
• If less than infinite resistance
Replace the A23D Door Latch Assembly-Driver.
• If infinite resistance
3. Test for less than 2 ohms between the signal terminal 5 and the ground terminal 3 with the switch in the closed position.
• If 2 ohms or greater
Replace the A23D Door Latch Assembly-Driver.
• If less than 2 ohms
4. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Window and Multifunction Switch Replacement Front Side Door Window and Multifunction Switch Replacement
* Front Side Door Latch Replacement Service and Repair