Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2007MKZ FWD V6-3.5L VIN TREPAIR AND DIAGNOSISBODY AND FRAMELOCKSPOWER LOCKSTESTING AND INSPECTIONPINPOINT TESTSTEST G: THE DOOR LOCK SWITCHES OPERATE ONLY ONE WAY - WITH MEMORY
2007 Lincoln MKZ FWD V6-3.5L VIN T
Test G: The Door Lock Switches Operate Only One Way - With Memory
2007 Lincoln MKZ FWD V6-3.5L VIN TSECTION Test G: The Door Lock Switches Operate Only One Way - With Memory
PINPOINT TEST G: THE DOOR LOCK SWITCHES OPERATE ONLY ONE WAY - WITH MEMORY
Normal Operation
The driver door module (DDM) monitors circuits CPL42 (GY/YE) and CPL43 (VT/GY) for a ground signal indicating a lock or unlock request from the driver door lock control switch. The DDM locks or unlocks the driver door latch and sends a network message to the smart junction box (SJB) to lock or unlock the remaining door latches. The SJB monitors circuits CPL42 (GY/YE) and CPL43 VT/GY) for a ground signal indicating a lock or unlock request from the passenger door lock control switch. The SJB locks or unlocks the RH front and rear doors and sends a network message to the DDM to lock or unlock the driver door latch.
DTC B1309 - is an on-demand DTC that sets if the SJB detects a short to ground on the driver door lock switch circuit CPL42 (GY/YE).
DTC B1341 - is an on-demand DTC that sets if the SJB detects a short to ground on the driver door unlock switch circuit CPL43 (VT/GY).
DTC B2574 - is a continuous DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door lock switch circuit CPL42 (GY/YE). It is also an on-demand DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door lock switch circuit CPL42 (GY/YE) or a switch that is active for greater than two minutes.
DTC B2575 - is a continuous DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door unlock switch circuit CPL43 (VT/GY). It is also an on-demand DTC that sets if the SJB detects a short to ground for greater than two minutes on the passenger door unlock switch circuit CPL43 (VT/GY) or a switch that is active for greater than two minutes.
Possible Causes
- Circuit CPL42 (GY/YE) open, short to ground or voltage
- Circuit CPL43 (VT/GY) open, short to ground or voltage
- Door lock control switch
- DDM
- SJB
G1-G5:
G5-G7:
G7-G9:
G9-G12:
Normal Operation
The driver door module (DDM) monitors circuits CPL42 (GY/YE) and CPL43 (VT/GY) for a ground signal indicating a lock or unlock request from the driver door lock control switch. The DDM locks or unlocks the driver door latch and sends a network message to the smart junction box (SJB) to lock or unlock the remaining door latches. The SJB monitors circuits CPL42 (GY/YE) and CPL43 VT/GY) for a ground signal indicating a lock or unlock request from the passenger door lock control switch. The SJB locks or unlocks the RH front and rear doors and sends a network message to the DDM to lock or unlock the driver door latch.
DTC B1309 - is an on-demand DTC that sets if the SJB detects a short to ground on the driver door lock switch circuit CPL42 (GY/YE).
DTC B1341 - is an on-demand DTC that sets if the SJB detects a short to ground on the driver door unlock switch circuit CPL43 (VT/GY).
DTC B2574 - is a continuous DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door lock switch circuit CPL42 (GY/YE). It is also an on-demand DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door lock switch circuit CPL42 (GY/YE) or a switch that is active for greater than two minutes.
DTC B2575 - is a continuous DTC that sets if the DDM detects a short to ground for greater than two minutes on the passenger door unlock switch circuit CPL43 (VT/GY). It is also an on-demand DTC that sets if the SJB detects a short to ground for greater than two minutes on the passenger door unlock switch circuit CPL43 (VT/GY) or a switch that is active for greater than two minutes.
Possible Causes
- Circuit CPL42 (GY/YE) open, short to ground or voltage
- Circuit CPL43 (VT/GY) open, short to ground or voltage
- Door lock control switch
- DDM
- SJB
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.