LEXUS RX450h 2018 Owners Manual

6317-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85U■
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 the local laws. ■
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.

632 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UTurn the power switch off.
Open the fuse box cover. ■
Engine compartment
Push the tab in and lift the lid off.
■
Driver’s side instrument panel
Remove the lid.Checking and replacing fuses If any of the electrical components do not operate, a fuse may have blown. If
this happens, check and repl ace the fuses as necessary.1
2

6337-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85U■
Luggage compartment (type A fuse box)
■
Luggage compartment (type B fuse box)
Remove the fuse with the pullout
tool.
Only some fuses can be removed
using the pullout tool. 
RX450h 
RX450hL
Remove the 12-volt battery cover.
( → P. 606) Remove the deck board and side aux-
iliary box cover and 12-volt battery
cover. ( → P. 606)
RX450h 
RX450hL
Remove the terminal cover. Remove the terminal cover. 3

634 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UCheck if the fuse is blown.
Normal fuse
Blown fuse Replace the blown fuse with a new
fuse of an appropriate amperage rat-
ing. The amperage rating can be
found on the fuse box lid.
Many types of fuse are used on this
vehicle. This illustration shows a com-
mon type of fuse used on this vehicle.■
After a fuse is replaced ●
If the lights do not turn on even after the fuse has been replaced, a bulb may need
replacement. ( → P. 637)●
If the replaced fuse blows again, have th e vehicle inspected by your Lexus dealer.■
If there is an overload in a circuit
The fuses are designed to blow, protec ting the wiring ha rness from damage.■
When replacing light bulbs
Lexus recommends that you use genuine Lexus products designed for this vehicle.
Because certain bulbs are conne cted to circuits designed to prevent overload, nongenu-
ine parts or parts not designed for this vehicle may be unusable. 4
1
2
WARNING ■
To prevent system breakdowns and vehicle fire
Observe the following precautions.
Failure to do so may cause damage to th e vehicle, and possibly a fire or injury.●
Never use a fuse of a higher amperage rating than that indicated, or use any other
object in place of a fuse. ●
Always use a genuine Lexus fuse or equivalent.
Never replace a fuse with a wi re, even as a temporary fix.●
Do not modify the fuses or fuse boxes. ■
Fuse box near the power control unit
Never check or replace the fuses as there are high volt age parts and wiring near the
fuse box.
Doing so may cause electric shock, re sulting in death or serious injury.
NOTICE ■
Before replacing fuses
Have the cause of electrical overload determined and repaired by your Lexus dealer as
soon as possible.

6357-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85UAdjustment bolt A
Adjustment bolt B
Make sure the vehicle has a full tank of gasoline and the area around the
headlight is not deformed.
Park the vehicle on level ground.
Sit in the driver’s seat.
Bounce the vehicle several times.Headlight aim (vehicles with single-beam head-
lights) Vertical movement adjusting bolts 1
2
Before checking the headlight aim 1
2
3
4

636 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85UUsing a Phillips-head screwdriver,
turn bolt A in either direction. Remember the turning direction and the
number of turns.
Turn bolt B the same number of turns
and in the same direction as step . If the headlight cannot be adjusted using
this procedure, take the vehicle to your
Lexus dealer to adjust the headlight aim.Adjusting the headlight aim 1
2
1

6377-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85UCheck the wattage of the light bulb to be replaced. ( → P. 637)
→ P. 146Light bulbs You may replace the following bulbs by yo urself. The difficulty level of replace-
ment varies depending on the bulb. If necessary bulb replacement seems diffi-
cult to perform, contact your Lexus dealer.
For more information about replacing ot her light bulbs, contact your Lexus
dealer.
Preparing for light bulb replacement
Canceling the power back door system

638 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85U■
Front
Bulb locations
Front turn signal light (vehic les with single-beam headlights)
Front side marker light (vehic les with single-beam headlights)1
2

6397-3. Do-it-yourself maintenance
7
Maintenance and care
RX450h_RX450hL _U_OM48F85U■
Rear
Back-up light
Rear turn signal light (vehicles with single-beam headlights) 1
2

640 7-3. Do-it-yourself maintenance
RX450h_RX450hL _U_OM48F85U■
Front side marker lights (vehicle s with single-beam headlights)
To ensure enough space to per-
form work, turn the steering
wheel to rotate the front wheel
away from the bulb to be
replaced.
Remove the 3 fender liner clips. Turn the steering wheel to the left
when replacing the right side light
bulb, and turn the steering wheel to
the right when replacing the left side
light bulb.
When removing a fender liner clip,
use a flathead screwdriver to pry the
center portion out and then remove
the whole clip.
Pull back the fender liner until the
connector is visible.
Partially remove the fender liner
and turn the bulb base counter-
clockwise and remove it.Replacing light bulbs 1
8 2
3