Power Door Lock Components
The power door lock system consists of the following components:
• | Driver door lock switch |
• | Passenger front door lock switch |
• | LH middle door lock switch (w/ V4U) |
• | RH middle door lock switch (w/ V4U) |
• | Driver door switch assembly (DDSA) |
• | Driver door module (DDM) |
• | Passenger front door module (PDM) |
• | LH rear door module (LRDM) |
• | RH rear door module (RRDM) |
• | Left middle door module (LMDM) (w/ V4U) |
• | Right middle door module (RMDM) (w/ V4U) |
• | Driver door lock actuator |
• | Passenger front door lock actuator |
• | LH rear door lock actuator |
• | RH rear door lock actuator |
• | LH middle door lock actuator (w/V4U) |
• | RH middle door lock actuator (w/ V4U) |
• | Driver door cylinder unlock switch |
• | Rear integration module (RIM) |
• | EXPORT LTG/PWR LK 15 amp fuse |
• | Class 2 serial data link |
Door Lock System Controls
The power door lock system can be controlled by any of the following:
• | A power door lock switch activation |
• | A keyless entry transmission |
• | A driver door key cylinder unlock switch activation |
• | An automatic door lock function |
Power Door Lock Operation
The vehicle is equipped with power door locks. Each lock actuator is powered
and controlled by the door module mounted in the individual door, but the rear integration
module (RIM), which is the master control for the door lock system, determines when
the lock functions are permitted. The RIM receives and examines the requested lock
function from the individual door modules, or from the remote function actuator (RFA)
via the class 2 serial data circuit. The RIM also examines the transmission shift
selector position and the ignition switch position information available over the
Class 2 serial data circuits. If the RIM determines that a lock or unlock function
is permitted, it sends a class 2 message back to the individual door modules commanding
them to perform that Lock or Unlock function.
Door Modules Power and Ground
In order to control power door lock operations, as well as other door functions,
door modules must be powered up. Battery voltage is supplied by the rear fuse block,
through separate circuits, to each door module. Each door module is separately grounded
through a ground stake. The door modules also use these power and ground supplies
to provide voltage and ground to their associated window switch. In addition, the
front door modules use these power and ground supplies for outside rearview mirror
operation, and to power the window express up sensors.
Door modules battery voltage is supplied as follows:
• | The DDM battery voltage circuit is fed by the DRVR MDL 10 amp fuse in
the rear fuse block. |
• | The PDM battery voltage circuit is fed by the PASS MDL 10 amp fuse in
the rear fuse block. |
• | The LRDM and RRDM also have separate battery voltage circuits to power
them up, but these circuits are fed by the same EXPORT LTG/PWR LK 15 amp fuse located
in the rear fuse block. |
• | The DDSA receives battery voltage, through the DDM, from the DRVR MDL
10 amp fuse in the rear fuse block . The DDSA is grounded, through the DDM, to a
ground stake. |
These circuits are in the C3 harness connector of each door module and must
not be confused with the battery voltage and ground circuits that are used exclusively
to drive the power window motors. For more information concerning the window motor
power and ground circuits, refer to
Power Windows Description and Operation
Front Passenger Door Power Lock Switch
For battery voltage and ground, the front passenger door power lock switch is
wired to the front passenger door module. There are two circuits for battery voltage,
one for a lock signal, and one for an unlock signal. The module supplies ground to
the switch via a third circuit. When the switch is operated for a lock or unlock
function, the normally open switch contacts for that function are closed to ground
and voltage flows through the switch, providing the module with the appropriate signal
input.
Driver Door Power Lock Switch
The driver door lock switch is similar to the front passenger door lock switch,
however, for voltage it is wired to the driver door switch assembly (DDSA). The ground
circuit is supplied by the driver door module (DDM). It also works the same way as
the front passenger door lock switch, but the switch signal input information is
detected and processed by the DDSA and less operating voltage is required. The DDSA
has two circuits that supply 5 volts to the switch, one for a lock signal, and one
for an unlock signal. When the switch is operated for a lock or unlock function,
the normally open switch contacts for that function are closed to ground, the voltage
flows through the switch and is detected by the DDSA. The DDSA then relays the switch
information to the DDM via the class 2 serial data circuit.
Power Door Lock Motors
A power door lock motor is contained within each door lock actuator. Each door
module supplies battery voltage and ground, through the door lock actuator motor
control circuits to its associated door lock actuator motor. The power door lock
motors are reversible. The function performed by the lock motor, Lock or Unlock,
depends on which motor control circuit the voltage is applied to, and which motor
control circuit the ground is applied to. To perform a lock function, the module
applies voltage to the door lock motor lock circuit, and ground to the door lock
motor unlock circuit. To perform an unlock function, the door module reverses the
polarity and applies voltage to the door lock motor unlock circuit, and ground to
the door lock motor lock circuit.
Automatic Door Locks
The automatic door lock system provides for locking or unlocking one, or, all
of the doors when shifting the transmission. When the vehicle doors are closed, the
ignition is turned to ON, and the transmission is shifted out of Park, all the doors
will lock. When the vehicle is stopped and the transmission is shifted into Park
one, or, all of the doors will unlock. This system is also commanded according to
the information stored in the RIM. Automatic door locking is programmed during the
manufacturing process but it can be custom programmed by the operator. For information
concerning custom programming available and programming instructions, refer to
Driver Personalization
in Personalization.
Anti-Lockout Feature
Leaving the key in the ignition with any door open will disable the use of the
power door locks and the Remote Keyless Entry (RKE) lock function.
The anti-lockout feature can be overridden by holding the lock switch in the
LOCK position for more than 3 seconds.
Central Door Unlock
With this feature, all doors can be unlocked from the driver door using the
door key. The central door unlock feature is activated when the driver door key is
inserted into the driver door lock cylinder and turned to the Unlock position. This
activates the door key cylinder unlock switch, which is fastened to the driver door
lock cylinder on the inside of the door. For power and ground, the door key cylinder
unlock switch is wired to the driver door module (DDM). The doors will unlock when
either of the following happens:
• | The DDM sees that its door cylinder switch is continuously closed for
longer than 3 seconds. |
• | The DDM sees that its door cylinder switch is closed twice in 3 seconds. |
The DDM sends a class 2 message to the RIM indicating the above. The RIM sends
a class 2 message to all of the door modules to unlock all doors.
The DDM supplies battery voltage through the driver door key switch signal circuit,
and ground via a ground circuit to the normally open contacts of the door key cylinder
unlock switch. When the switch is closed, voltage flows through the switch, providing
the DDM with the necessary signal input.