2022 LEXUS RX450h auxiliary battery

3716-3. Do-it-yourself maintenance
6
Maintenance and care
2Remove the cover after removing
the clips.
1 Press
2 Pull out
RX450hL
1 Remove the deck board and side
auxiliary box cover. ( P.327)
2 Remove the 12-volt battery cover.
3 Remove the deck side trim cover.
■Before recharging
When recharging, the 12-volt battery pro-
duces hydrogen gas which is flammable
and explosive. Therefore, observe the fol- lowing precautions before recharging:
●If recharging with the 12-volt battery
installed on the vehicle, be sure to discon-
nect the ground cable.
●Make sure the power switch on the char-
ger is off when connecting and discon-
necting the charger cables to the 12-volt
battery.
■After recharging/reconnecting the
12-volt battery
●The hybrid system may not start. Follow
the procedure below to initialize the sys-
tem.
1 Shift the shift lever to P.
2 Open and close any of the doors.
3 Restart the hybrid system.
●Unlocking the doors using the smart
access system with push-button start may
not be possible immediately after recon-
necting the 12-volt battery. If this hap-
pens, use the wireless remote control or
the mechanical key to lock/unlock the
doors.
●Start the hybrid system with the power
switch in ACCESSORY mode. The
hybrid system may not start with the
power switch turned off. However, the
hybrid system will operate normally from
the second attempt.
●The power switch mode is recorded by
the vehicle. If the 12-volt battery is recon-
nected, the vehicle will return the power
switch mode to the stat us it was in before
the 12-volt battery was disconnected.
Make sure to turn off the power before
disconnect the 12-volt battery. Take extra
care when connecting the 12-volt battery
if the power switch mode prior to dis-
charge is unknown.
If the system will not start even after multiple
attempts at all the methods above, contact
your Lexus dealer.

3886-3. Do-it-yourself maintenance
1Turn the power switch off.
2 Open the fuse box cover.
Engine compartment
Push the tab in and lift the lid off.
Driver’s side instrument panel
Remove the lid.
Luggage compartment (type A fuse
box)
RX450h:
Remove the 12-volt battery cover.
( P.370) RX450hL:
Remove the deck board and side auxiliary
box cover and 12-volt battery cover.
(
P.370)
Luggage compartment (type B fuse
box)
RX450h:
Remove the terminal cover.
RX450hL:
Remove the terminal cover.
Checking and replacing
fuses
If any of the electrical components
do not operate, a fuse may have
blown. If this happens, check and
replace the fuses as necessary.
Checking and replacing fuses

505Alphabetical Index
Alphabetical Index
A
A/CAir conditioning filter ...............................383
Front automatic air conditioning system.........................................................................298
Front seat concentr ated airflow mode
(S-FLOW).................................................306
Rear automatic air conditioning system .........................................................................309
ABS (Anti-lock Brake System).............. 278 Warning light ................................................. 412
ACA (Active Cornering Assist) ........... 279
Active Cornering Assist (ACA) ........... 279
Adaptive Front-lighting System (AFS)200
Adaptive Variable Suspension System279
AFS (Adaptive Front- lighting System)200
AHB (Automatic High Beam) .................201
Air conditioning filter ................................. 383
Air conditioning system Air conditioning filter ...............................383
Front automatic air conditioning system.........................................................................298
Front seat concentr ated airflow mode
(S-FLOW).................................................306
Rear automatic air conditioning system .........................................................................309
Airbags Airbag operating conditions................... 33
Airbag precautions for your child ........ 36
Correct driving posture ............................ 25
Curtain shield airbag operating condi- tions .................................................................. 33
Curtain shield airbag precautions ....... 36
Front passenger occupant classification system ............................................................. 39
General airbag precautions ................... 36
Locations of airbags.................................... 30
Modification and disp osal of airbags . 38
Side airbag operating conditions ......... 33
Side airbag precautions ............................ 36 Side and curtain shie
ld airbags operating
conditions ...................................................... 33
Side and curtain shield airbags precau- tions .................................................................. 36
SRS airbags......................................................30
SRS warning light.........................................412
Alarm ....................................................................74 Warning buzzer .......................................... 410
Anchor brackets ..................................... 46, 57
Antennas (smart acc ess system with
push-button start).......................................125
Anti-lock Brake System (ABS).............. 278 Warning light .................................................412
Approach warning...................................... 242
Armrest............................................................ 337
Assist grips ..................................................... 337
Audio system-linked display ...................... 92
Automatic headlight leveling system ....199
Automatic High Beam ................................201
Automatic light control system............... 198
Auxiliary boxes ..................................323, 326
Average fuel economy................................. 90
Average vehicle speed ................................ 90
AWD Control.................................................... 91
B
Back door .......................................................... 113
Back-up light Wattage ......................................................... 460
Back-up lights Replacing light bulbs................... 393, 399
Battery (12-volt battery) Battery checking ........................................370
If the 12-volt battery is discharged ......441
Preparing and checking before winter......................................................................... 286
Warning light .................................................. 411
Battery (traction battery) ............................ 69
Blind Spot Monitor (BSM)....................... 246
Bottle holders ................................................ 322
Brake Brake hold ...................................................... 196