Hyundai Equus: Description and Operation

Second generation VI (2009–2024) / Hyundai Equus VI 2009-2024 Service Manual / Body Electrical System / Power Door Locks / Description and Operation

Description

System Overview

The larger the size of the door, the harder it is to close it. Quite often we see people driving with a door not completely closed.

Power door latch addresses the issue of partially closed doors. The system is featured on all four doors and closes partially shut doors without any assistance from the driver/passenger.

Commonly, partial door closure is known as 1st closure and full door closure is known as 2nd closure.

-	Featured on all four doors.

-	Consists of a door lock actuator and a soft closing actuator.

-	Locks/unlocks doors using DDM and ADM signals.

System Structure

Following is a diagram of the driver’s side door lock and power latch units. DDM monitors power door latch lock/unlock activation power and switch statuses (lock/unlock switch and door key switch), and the power latch feature is signal-operated.

Latch & Actuator

Known collectively as the door lock actuator and as the part where the striker lands when the door is closed.

1.	Latch Identical in design to conventional latches and contains an SCA cable that supplies the power needed to close partially closed doors.

2.	Actuator Contains a door lock/unlock control motor, a lock/unlock detection switch, and a door key detection switch. Power door latch actuators also feature a pawl switch and an ajar switch that communicate with SCA.

SCA (Soft Closing Actuator)

SCA utilizes its P/C motor to completely close partially closed doors.

1.	ECU ECU controls SCA by monitoring the ajar and pawl switches and determining whether or not to engage the power latch feature. ECU is built on a PCB inside SCA.

2.	P/C Motor Upon receiving a signal from the ECU, the P/C motor rotates to pull the door shut and then rewinds to standby for the next activation signal.

3.	Hall Sensor The hall sensor is mounted to the PCB and determines the power latch’s initial position by sensing the location of a magnet that’s attached to the gear.

Power Door Latch Switch

The power door latch feature must first determine if the door is completely shut or partially shut. This is accomplished by a switch located inside the latch (door lock actuator) and a body electrical switch.

Ajar Switch

The word “ajar” means slightly open, and the ajar switch determines whether the striker has completely engaged the latch when the door is shut. This switch is mounted inside the door latch and is triggered by an internal link. The switch’s function reaches a full cycle as the signal goes from On to Off.

And, because the switch is mounted inside the actuator, it’s not possible to inspect the switch individually.

To test, use the external connector and measure the voltage change.

2.	Pawl Switch The pawl switch is triggered when the door is partially shut, activating the power door latch feature until the switch sends an off signal. Like the ajar switch, the pawl switch is installed inside the actuator and must also be tested using the external connector.

Ajar & Pawl Switch Activation

These switches have the following activation scheme:

Switch	Door Ajar	Door Closing	Door Closed
Ajar Switch	ON	ON	OFF
Pawl Switch	ON	OFF > ONInternal link changes the contact status.	OFF
Power Latch	Inactive	Active	Terminated

Components and Components Location

Component Location 1. DDM (Driver Door Module)2. ADM (Assist Door Module)3. IPM (Instrument Panel Module)4. Door lock knob5. Trunk lid actuator6. Front door lock actuator7. Rear door lock actuato ...

Power Door Lock Actuators Repair procedures

Inspection Front Door Lock Module Inspection 1. Remove the front door trim. (Refer to Body - "Front Door Trim") 2. Remove the front door module. (Refer to Body - "Front Door Module") 3. ...

Hyundai Equus: Description and Operation

Components and Components Location

Power Door Lock Actuators Repair procedures

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