2018 LEXUS RCF key battery

375
Maintenance and care
6
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6-1. Maintenance and care
Cleaning and protecting
the vehicle exterior ................ 376
Cleaning and protecting
the vehicle interior................... 381
6-2. Maintenance
Maintenance
requirements ............................384
General maintenance.............. 387
Emission inspection and
maintenance (I/M)
programs ....................................390
6-3. Do-it-yourself
maintenance
Do-it-yourself service
precautions................................. 391
Hood ............................................... 393
Positioning a floor jack ............ 394
Engine compartment ............... 397
Tires ...................................................412
Tire inflation pressure............... 420
Wheels ........................................... 423
Air conditioning filter ............... 425
Electronic key battery .............. 427
Checking and replacing
fuses .............................................. 429
Light bulbs..................................... 432

3776-1. Maintenance and care
6
Maintenance and care
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Automatic car washes (vehicles without CFRP parts) ●
Fold the mirrors before washing the vehicle. Start washing from the front of the vehicle.
Make sure to extend the mirrors before driving. ●
RC F: Wash the vehicle with the active rear wing retracted. If the vehicle is washed with
the active rear wing raised, depending on the type of automatic car wash, the brushes
of the automatic car wash may become stuck on the active rear wing. In this case, the
active rear wing may not be washed very well or may even be scratched or damaged.●
Brushes used in automatic car washes may scratch the vehicle body and damage the
paint. ■
Automatic car washes (vehicles with CFRP parts)
Do not use automatic car washes as they may scratch the CFRP parts and damage the
paint. ■
High pressure car washes ●
Do not allow the nozzles of the car wash to come within close proximity of the windows. ●
Before using the car wash, check that the fuel filler door on your vehicle is closed prop-
erly. ■
When using a car wash
If the door handle becomes wet while the electronic key is within the effective range, the
door may lock and unlock repeatedly. In that case, follow the following correction proce-
dures to wash the vehicle: ●
Place the key in a position 6 ft. (2 m) or more separate from the vehicle while the vehi-
cle is being washed. (Take care to ensure that the key is not stolen.) ●
Set the electronic key to battery-saving mo de to disable the sm art access system with
push-button start. (  P. 158)■
Aluminum wheels (vehicles without matte black painted wheels) ●
Remove any dirt immediately by using a neutral detergent. ●
Wash detergent off with water immediately after use. ●
To protect the paint from damage, make sure to observe the following precautions.
• Do not use acidic, alkaline or abrasive detergent
• Do not use hard brushes
• Do not use detergent on the wheels when they are hot, such as after driving or park-
ing in hot weather■
Aluminum wheels (vehicles with matte black painted wheels)
As matte black painted wheels require differ ent cleaning methods than conventional alu-
minum wheels. For details, consult your Lexus dealer. ●
Remove dirt using water. If the wheels are excessively dirty, use a sponge or soft cloth
dampened with a diluted neutral detergent to remove the dirt. ●
When using detergent, make sure to rinse it off with water immediately. Then use a soft
cloth to wipe off the water. ●
To prevent the matte black paint from being damaged, make sure to observe the follow-
ing precautions:
• Do not scrub or polish the whee ls using a brush or dry cloth.
• Do not use any wheel coatings or abrasive detergents.
• When using an automatic car wash, disable/do not select the wheel brush function
(if such an option is available).
• Do not use a high pressure pre ssure washer or steam cleaner.
• Do not use detergent on the wheels when they are hot, such as after driving or park-
ing in hot weather.

4096-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care ■
Before recharging
When recharging, the battery produces hydrogen gas which is flammable and explosive.
Therefore, observe the following before recharging: ●
If recharging with the battery installed on the vehicle, be sure to disconnect the ground
cable. ●
Make sure the power switch on the charge r is off when connecting and disconnecting
the charger cables to the battery. ■
After recharging/reconnecting the battery
The engine may not start. Follow the procedure below to initialize the system.
Shift the shift lever to P.
Open and close either door.
Restart the engine. ●
Unlocking the doors using the smart access system with push-button start may not be
possible immediately after reconnecting the battery. If this happens, use the wireless
remote control or the mechanical key to lock/unlock the doors.●
Start the engine with the engine switch in ACCESSORY mode. The engine may not
start with the engine switch turned off. However, the engine will operate normally from
the second attempt. ●
The engine switch mode is recorded by the vehicle. If the battery is disconnected and
reconnected, the vehicle will return the engi ne switch mode to the status it was in
before the battery was disconnected. Make su re to turn off the engine before discon-
necting the battery. Take extra care when connecting the battery if the engine switch
mode prior to the battery being disconnected is unknown.
If the system will not start even after mult iple attempts, contact your Lexus dealer.1
2
3

4276-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 6
Maintenance and care ●
Flathead screwdriver ●
Small flathead screwdriver ●
Lithium battery CR2032
Take out the mechanical key.
Remove the cover. To prevent damage to the key, wrap the
tip of the screwd river with tape.
Remove the depleted battery. Insert a new battery with the “+” termi-
nal facing up.Electronic key battery Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery 1
2
3

428 6-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)■
Use a CR2032 lithium battery ●
Batteries can be purc hased at your Lexus dealer, loca l electrical appliance shops or
camera stores. ●
Replace only with the same or equivalent type recommended by the manufacturer. ●
Dispose of used batteries according to local laws. ■
When the card key battery needs to be replaced (if equipped)
The battery for the card key is available only at Lexus dealers. Your Lexus dealer can
replace the battery for you. ■
If the electronic key battery is depleted
The following symptoms may occur: ●
The smart access system with push-button start and wireless remote control will not
function properly. ●
The operational rang e will be reduced.
WARNING ■
Removed battery and other parts
These parts are small and if swallowed by a child, they can cause choking. Keep away
from children. Failure to do so coul d result in death or serious injury.
NOTICE ■
For normal operation after replacing the battery
Observe the following precautions to prevent accidents: ●
Always work with dry hands.
Moisture may cause the battery to rust. ●
Do not touch or move any other co mponent inside the remote control.●
Do not bend either of the battery terminals.

441
When trouble arises
7
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 7-1. Essential information
Emergency flashers .................. 442
If your vehicle has
to be stopped in
an emergency .......................... 443
7-2. Steps to take in
an emergency
If your vehicle needs to be
towed ........................................... 444
If you think something is
wrong ............................................ 451
Fuel pump shut off system ...... 452
If a warning light turns on
or a warning buzzer
sounds.......................................... 453
If a warning message is
displayed.....................................460
If you have a flat tire
(vehicles with a
spare tire) ...................................489
If you have a flat tire
(vehicles with
an emergency
tire puncture repair kit) ........502
If the engine will not start ......... 516
If the electronic key does
not operate properly .............. 518
If the vehicle battery is
discharged ................................. 522
If your vehicle overheats ......... 526
If the vehicle becomes
stuck ............................................. 532

4857-2. Steps to take in an emergency
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 7
When trouble arises  Con-
tinuous An attempt was made to lock the
doors using the smart access system
with push-button start while the
electronic key was still inside the
vehicle.
 Retrieve the electronic key
from the vehicle and lock the
doors again.
Once Con-
tinuous An attempt was made to lock either
front door by opening a door and
putting the inside lock button into
the lock position, then closing the
door with the electronic key still
inside the vehicle.
 Retrieve the electronic key
from the vehicle and lock the
doors again.
Once  The electronic key has a low battery.
 Replace the electronic key bat-
tery. (  P. 427)
Once  The steering lock could not be
released within 3 seconds of the
engine switch being pressed.
 Press the engine switch while
depressing the brake pedal and
moving the steering wheel left
and right.Interior
buzzer Exterior
buzzer Warning message Details/Actions
(Flashes)

516 7-2. Steps to take in an emergency
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)One of the following may be the cause of the problem: ●
There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle. ●
The engine may be flooded.
Try to restart the engine again follo wing correct starting procedures.
(  P. 207)●
There may be a malfunction in th e engine immobilizer system. (  P. 79)
One of the following may be the cause of the problem: ●
The battery may be discharged. (  P. 522)●
The battery terminal connections may be loose or corroded.
The engine starting system may be malfun ctioning due to an electrical problem
such as electronic key battery depletio n or a blown fuse. However, an interim
measure is available to start the engine. (  P. 517)If the engine will not start If the engine will not start even though correct starting procedures are being
followed (  P. 207), consider each of the following points:
The engine will not start even thoug h the starter motor operates nor-
mally.
The starter motor turns over slowly , the interior lights and headlights
are dim, or the horn does not sound or sounds at a low volume.
The starter motor does not turn over