2018 LEXUS RCF ECU

771-1. For safe use
1
For safety and security
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)Open the anchor bracket cover, latc h the hook onto the anchor bracket
and tighten the top tether strap. Make sure the top tether strap is securely latched.
■
Laws and regulations pertaining to anchorages
The LATCH system conforms to FMVSS225 or CMVSS210.2.
Child restraint systems conforming to FMV SS213 or CMVSS213 specifications can be
used.
This vehicle is designed to conform to the SAE J1819.2 
RC350/RC300 
RC F
WARNING ■
When installing a child restraint system
Observe the following precautions.
Failure to do so may result in death or serious injury.●
Firmly attach the top tether strap and make sure that the belt is not twisted. ●
Do not attach the top tether strap to anything other than the anchor bracket. ●
Shake the child restraint syst em left and right, and forward and backward to ensure
that it has been securely installed. ●
After securing a child restraint system, ne ver adjust the seat.●
Follow all installation instructions provided by the child restraint system manufacturer.
NOTICE ■
Anchor brackets (for top tether strap)
When not in use, make certain to close the lid. If it remains open, the lid may be dam-
aged. Hook
Top tether strap Hook
Top tether strap

79 1
For safety and security
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 1-2. Theft deterrent system
The indicator light flashes after the
engine switch has been turned off to
indicate that the system is operating.
The indicator light stops flashing after
the engine switch has been turned to
ACCESSORY or IGNITION ON
mode to indicate that the system has
been canceled. ■
System maintenance
The vehicle has a maintenance-free type engine immobilizer system. ■
Conditions that may cause the system to malfunction ●
If the grip portion of the key is in contact with a metallic object●
If the key is in close proximity to or touching a key registered to the security system (key
with a built-in transponder chip) of another vehicleEngine immobilizer system The vehicle’s keys have built-in tran sponder chips that prevent the engine
from starting if a key has not been previously registered in the vehicle’s on-
board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
This system is designed to help preven t vehicle theft but does not guarantee
absolute security agai nst all vehicle thefts.
NOTICE ■
To ensure the system operates correctly
Do not modify or remove the system. If mo dified or removed, the proper operation of
the system cannot be guaranteed.

811-2. Theft deterrent system
1
For safety and security
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Triggering of the alarm
The alarm may be triggered in the following situations:
(Stopping the alarm deactivates the alarm system.)
■
Alarm-operated door lock
In the following cases, depending on the si tuation, the door may automatically lock to
prevent improper entry into the vehicle: ●
When a person remaining in the vehicle un locks the door and the alarm is activated.●
While the alarm is activated, a person re maining in the vehicl e unlocks the door.●
When recharging or replacing the battery ●
A person inside the vehicle opens a door, the
trunk or hood, or unlocks the vehicle using a
inside lock button. ●
The trunk is opened using the mechanical key.
●
The battery is recharged or replaced when the
vehicle is locked. (  P. 524)
NOTICE ■
To ensure the system operates correctly
Do not modify or remove the system. If mo dified or removed, the proper operation of
the system cannot be guaranteed.

88 2. Instrument cluster
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)●
Drive mode indicators 
RC350/RC300 (except F SPORT models) 
RC350/RC300 (F SPORT models) * 2
LDA (Lane Departure
Alert) indicator (  P. 261)
* 1
Eco Driving Indicator Light
(  P. 116, 132)
* 1, 3
PCS warning light
(  P. 254)
* 1, 7
(U.S.A.)
“AIR BAG ON/OFF”
indicator (  P. 51)
* 4, 6
(if equipped)
BSM (Blind Spot Monitor)
outside rear view mirror
indicators (  P. 290)
* 1, 7
(Canada)
“AIR BAG ON/OFF”
indicator (  P. 51)
* 7
Security indicator
(  P. 79, 80) * 8
“EXPERT” indicator
(  P. 316)
* 5
Low outside temperature
indicator (  P. 91, 96)
Eco drive mode indicator
(  P. 301) “SPORT” indicator
(  P. 301)
Snow mode indicator
(  P. 214)
Eco drive mode indicator
(  P. 301) “CUSTOM” indicator
(  P. 301)
“SPORT S” indicator
(  P. 301) Snow mode indicator
(  P. 214)
“SPORT S+” indicator
(  P. 301)

142 3-1. Key information
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Card key (if equipped) ●
The card key is not waterproof. ●
The mechanical key that is stored inside the card key should be us ed only if a problem
arises, such as when the card key does not operate properly.●
If it is difficult to take out the mechanical key, push down the lock release button using a
pen tip etc. If it is still difficult to pull it out, use a coin etc.
■
When required to leave the vehicle’s key with a parking attendant
Set the luggage security system (  P. 152) on and lock the glove box (  P. 351) as cir-
cumstances demand.
Remove the mechanical key for your own use and provide the attendant with the elec-
tronic key only. ■
If you lose your mechanical keys
New genuine mechanical keys can be made by your Lexus dealer using another
mechanical key and the key number stamped on your key number plate. Keep the plate
in a safe place such as your wallet, not in the vehicle. ■
When riding in an aircraft
When bringing an electronic key onto an aircraft, make sure you do not press any but-
tons on the electronic key while inside the airc raft cabin. If you are carrying an electronic
key in your bag etc., ensure that the buttons are not likely to be pressed accidentally.
Pressing a button may cause the electronic key to emit radio waves that could interfere
with the operation of the aircraft. ●
To store the mechanical key in the card key,
insert it while pressing the lock release button. ●
If the battery cover is not installed and the bat-
tery falls out or if the battery was removed
because the key got wet, reinstall the battery
with the positive terminal facing the Lexus
emblem.

145
3
Operation of each component
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)3-2. Opening, closing and locking the doors and trunk
◆ Smart access system with push-button start
Carry the electronic key to enable this function.
Grip the driver’s door handle to
unlock the door. Grip the passen-
ger’s door handle to unlock both
side doors.
* Make sure to touch the sensor on the
back of the handle.
The doors cannot be unlocked for 3
seconds after the doors are locked.
* : The door unlock settings can be
changed. (  P. 149, 569)
Touch the lock sensor (indentation on the side of the door handle) to lock
both side doors. Check that the door is securely locked.
◆ Wireless remote control
Locks both side doors Check that the door is securely
locked.
Unlocks both side doors Pressing the button unlocks the
driver’s door. Pressing the button
again within 5 seconds unlocks the
other door.
Press and hold to open the windows
and moon roof.
*
* : This setting must be custom ized at your Lexus dealer.Doors Unlocking and locking the doors from the outside 1
2
1
2

146 3-2. Opening, closing and locking the doors and trunk
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Operation signals
A buzzer sounds and the emergency flashers flash to indicate that the doors have been
locked/unlocked. (Locked: once; Unlocked: twice)
A buzzer sounds to indicate that th e windows and moon roof are operating.■
Security feature
If a door is not opened within approximately 60 seconds after the vehicle is unlocked, the
security feature automatically locks the vehicle again. ■
Welcome light illumination control
The side marker, parking, tail and license plate lights automati cally turn on at night when
the doors are unlocked using the entry function or wireless remote control if the light
switch is in the “AUTO” position. ■
When the door cannot be locked by the lock sensor on the surface of the door handle
■
Door lock buzzer
If an attempt to lock the doors is made when a door is not fully closed, a buzzer sounds
continuously for 5 seconds. Fully close the d oor to stop the buzzer, and lock the vehicle
once more. ■
Setting the alarm
Locking the doors will set the alarm system. (  P. 80)■
If the smart access system with push-button start or the wireless remote control does
not operate properly
Use the mechanical key and/or inside lock buttons to lock and unlock the doors.
(  P. 518)
Replace the key battery with a new one if it is depleted. (  P. 427)Use your palm to touch the lock sensor.

152 3-2. Opening, closing and locking the doors and trunk
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)Using the trunk grip, lower the trunk
without applying force to the side and
push the trunk down from the outside
to close it.
To protect luggage stored in the trunk ag ainst theft, the luggage security system
can be set to on.
RC350/RC300: Move the lug-
gage security system levers to the
lock position. To lock a luggage security system lever
from inside the cabin, fold the rear seat-
back forward, move the lever to the lock
position, and return the seatback to its
original position.
RC F: Close the inside trunk door. (  P. 357)
To disable the trunk opener, turn the
main switch in the glove box off.
On
Off When the main switch is off, the trunk
lid cannot be opened even with the
wireless remote co ntrol or entry
function.When closing the trunk
Luggage security system 1
1
2
1
2