Remote Control Door Lock Receiver Circuit Description
The power door locks/remote control door lock receiver system allows
the driver to operate the vehicle door locks. The driver can operate the
door lock from the outside of the vehicle. The driver uses a hand-held
radio transmitter. The transmitter operates in the UHF band. The
transmitter sends coded signals to the remote control door lock
receiver. The remote control door lock receiver detects and decodes
the signal. The remote control door lock receiver issues signals
in order to control the following locks:
| | These systems also operate in the usual manner. The door locks will
respond to the power door lock switches. For more information on the operation
of the liftgate release system refer to the schematics in Body Rear
End. |
Lock
The remote control door lock receiver receives a signal with a valid
vehicle access code (VAC) when you press the LOCK button on the transmitter.
Upon receiving the signal, the remote control door lock receiver locks
all of the doors.
Battery voltage is available at cavity R of the remote control
door lock receiver. The voltage energizes the door lock relay. The door lock
relay activates the door lock motors. The ground path for the left front
door lock is through the remote control door lock receiver cavity A.
The right front door lock motor and the side door lock motor ground
through the remote control door lock receiver cavity H. The rear
door lock motor grounds through the remote control door lock receiver
cavity G. The remote control door lock receiver grounds through
G200.
Unlock
The UNLOCK function separates into 2 operations. The separation depends
on how you press the UNLOCK button on the transmitter. If you press the UNLOCK
button once, the left front door unlocks. If you press the UNLOCK button
twice within 1-5 seconds, all of the doors will UNLOCK,
including the rear door.
The remote control door lock receiver unlock function sequence performs
when the following conditions occur:
- The remote control door lock receiver receives a valid VAC.
- You press the UNLOCK button once on the transmitter.
- You press twice within 1-5 seconds on the unlock
button on the transmitter.
Press Once
The remote control door lock receiver supplies the battery voltage to
the left front door lock motor through CKT 694 (TAN). The motor grounds
through the contacts of the lock switch. The lock switch is inside the
door lock relay. The left front door lock motor runs in order to unlock
the left front door.
Press Twice
The remote control door lock receiver activates the door unlock output
at cavity B in order to unlock all of the doors. The remote control
door lock receiver supplies the battery voltage to the coil of the unlock
relay in the door lock relay. Battery voltage applies through CKT 194
(WHT). The unlock relay energizes and closes the contacts. Battery voltage
is available to the following motors:
| • | The motors ground through the contacts of the lock switch. The
lock switch is inside the door lock relay assembly. The motors run unlocking
the following doors: |
| • | The remote control door lock receiver supplies battery voltage
to the door lock motors. The left front door lock motor receives voltage from
cavity A. Voltage from the unlock side of the lock relay is supplied
on CKT 294 (TAN) to cavity H of the receiver. The receiver
is then signaled to supply voltage to the rear door motor through cavity G
on CKT 246 (TAN). The rear door motor is then grounded through the
lock side of the relay. |
Remote Control Door Lock Switches
Lock
Voltage is available when any of the following switches are in the LOCK
position:
| • | The liftgate/unlock release |
| • | The left front power door lock |
| • | The right front power door lock |
Voltage is available from the following components to cavity F
of the door lock relay:
The voltage energizes the lock relay coil. The lock relay coil allows
the voltage to flow through the relay to the door lock motors. The voltage
flow locks all of the doors. Ground for the left front door lock
motor is through pin A of the remote control door lock receiver.
The right front door lock motor and the side door lock motor receive
the ground through pin H of the remote control door lock receiver.
The rear door lock motor receives the ground through pin G
of the remote control door lock receiver. The remote control door
lock receiver grounds through the G200 body ground.
Unlock
Voltage is available when the following switches are in the UNLOCK position:
| • | The liftgate lock/unlock release |
| • | The left front power door lock |
| • | The right front door lock |
Voltage is available through the following components to the right front
door lock motor and the side door lock motor:
| • | The PWR ACCY circuit breaker |
The remote control door lock receiver supplies the voltage to the left
front door lock motor and the rear door lock motor on CKT 294. The
voltage unlocks the doors. The door lock relay supplies the ground
for all motors to G200.
Liftgate Unlock/Release
Unlock
The remote control door lock receiver supplies the voltage at cavity G
to the rear door lock motor when the following conditions occur:
| • | You press the rear window release button on the transmitter. |
| • | The remote control door lock receiver receives a valid vehicle
access code. |
The normally closed contacts of the LOCK switch supply the ground for
the rear door lock motor. The closed contacts of the LOCK switch are inside
of the door lock relay. The ground completes the circuit and unlocks
the rear door lock motor. An important fact about this feature,
and due to safety reasons, only unlocks the liftgate motor and does
not pop the liftgate open.
Release
Pressing the liftgate release switch and pulling the liftgate handle
opens the liftgate when the rear door lock motor is in the UNLOCK position.
An important note is that once the liftgate motor has been unlocked,
only then the liftgate release switch will function.
