Page 362 of 520
362 4-3. Do-it-yourself maintenance
12-volt batteryCheck the 12-volt battery as follows:
■ 12-volt battery exterior
Make sure that the 12-volt battery terminals are not corroded and
that there are no loose connecti ons, cracks, or loose clamps.
Te r m i n a l s
Hold-down clamp
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads
wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, there may be a serious proble\
m.
■Before recharging the 12-volt battery
When recharging, the 12-volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, observe the following precautions before
recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to
disconnect the ground cable.
● Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the 12-volt battery.
Page 363 of 520

363
4-3. Do-it-yourself maintenance
4
Maintenance and care
■
After recharging/reconnecting the 12-volt battery
●Unlocking the doors using the smart key system may not be possible
immediately after reconnecting the 12-volt battery. If this happens, use
the wireless remote control or the mechanical key to lock/unlock the
doors.
● Start the EV system with the “POWER” switch in ACCESSORY mode.
The EV system may not start with the “POWER” switch turned off. How-
ever, the EV system will operate normally from the second attempt.
● The “POWER” switch mode is recorded by the vehicle. If the 12-volt bat-
tery is reconnected, the vehicle will return the “POWER” switch mode to
the status it was in before the 12-volt battery was disconnected. Make
sure to turn the “POWER” switch off before disconnecting the 12-volt bat-
tery. Take extra care when connecting the 12-volt battery if the “POWER”
switch mode prior to discharge is unknown.
● When the 12-volt battery is reconnected, start the EV system, depress
the brake pedal, and confirm that it is possible to shift into each shift posi-
tion.
If the system will not start even after multiple attempts, contact your Toyota
dealer.
CAUTION
■ Chemicals in the 12-volt battery
The 12-volt battery contains poisonous and corrosive sulfuric acid and may
produce hydrogen gas which is flammable and explosive. To reduce the risk
of death or serious injury, take the following precautions while working on or
near the 12-volt battery:
●Do not cause sparks by touching the 12-volt battery terminals with tools.
● Do not smoke or light a match near the 12-volt battery.
● Avoid contact with eyes, skin and clothes.
● Never inhale or swallow electrolyte.
● Wear protective safety glasses when working near the 12-volt battery.
● Keep children away from the 12-volt battery.
Page 392 of 520
392 4-3. Do-it-yourself maintenance
14 SMART7.5 A Smart key system
15 STRG LOCK 20 A Steering lock system
16 AM2 7.5 A Starting system
17 ABS 2 7.5 A Anti-lock brake system
18 PTC HTR 2 50 A Air conditioning system
19 PTC HTR 1 50 A Air conditioning system
20 PTC HTR 3 50 A Air conditioning system
21 CHARGER 5 A Charging system
22 IGCT 2 20 A THRML CTRL, G/W-IGCT
23 HV BATT 10 A Traction battery
24 PM-B 7.5 A Power management system
25 ODS 7.5 A Occupant classification system
26 HTR 50 A Air conditioning system
27 FAN 1 50 A Electric cooling fans
28 FAN 2 50 A Electric cooling fans
29 H-LP MAIN 40 A H-LP LH-LO, H-LP RH-LO, H-LP
LH-HI, H-LP RH-HI, manual head-
light leveling system, daytime run-
ning light system
30 ECU-B MAIN 30 A ECU-B 2, A/C-B
31 SPARE 5 A Spare fuse
32 SPARE 10 A Spare fuse
33 SPARE 20 A Spare fuse
FuseAmpereCircuit
Page 394 of 520
394 4-3. Do-it-yourself maintenance
■Under the instrument panel
Front side of the fuse block
FuseAmpereCircuit
1 DCM-IG2 5 A DCM-IG2
2 PM-IG2 5 A Power management system
3 IG2 2 5 ASteering lock system, smart key
system
4 IG2 1 5 AElectronically controlled brake sys-
tem, stop/tail lights, high mounted
stoplight
5 SSR-IG1 5 AVehicle stability control system,
steering sensor
6 EPS-IG1 5 A Electric power steering
7 P/W-MAIN 30 A Power windows
8 DEF 30 A Rear window defogger
Page 396 of 520
396 4-3. Do-it-yourself maintenance
17 WASHER15 AWindshield washer, rear window
washer
18 ECU-IG1 1 10 A Electronically controlled brake sys-
tem, tire pressure warning system,
air conditioning system, main body
ECU, anti-glare inside rear view
mirror, Vehicle Proximity Notifica-
tion System, navigation system
19 ECU-IG1 2 10 A Emergency flashers, rear window
defogger, air conditioning system
20 OBD 7.5 A On-board diagnosis system
21 STOP 10 AStop/tail lights, high mounted stop-
light
22 CHRG IND 7.5 A Charging indicator
23 DOOR 25 A Power windows
24 ACC-MAIN 25 A ACC-B, P/OUT, DCM
FuseAmpereCircuit
Page 417 of 520

5
When trouble arises
417
5-2. Steps to take in an emergency
If a war ning light turns on or a war ning buzzer sounds...
Stop the vehicle immediately. Continuing to drive the vehicle
may be dangerous.The following warning indicates a possible problem in the brake sys-
tem. Immediately stop the vehicle in a safe place and contact your
Toyota dealer.
*: Brake system warning buzzer:
When there is a possible problem that could affect braking performance, the
warning light will come on and a warning buzzer may sound.
Parking brake engaged warning buzzer:
P. 433
Warning lightWarning light/Details
(Red) Brake system warning light (warning buzzer)*
• Low brake fluid
• Malfunction in the brake system
This light also comes on when the parking brake is not
released. If the light turns off after the parking brake is fully
released the system is operating normally.
■ Brake system warning light operation
Although depressing the brake pedal repeatedly may cause the red brake
system warning light to turn on and the buzzer to sound, this does not indi-
cate a malfunction.
Calmly perform the following actio ns if any of the warning lights
comes on or flashes. If a light comes on or flashes, but then goes
off, this does not necessarily indicate a malfunction in the system.
However, if this continues to o ccur, have the vehicle inspected by
your Toyota dealer.
Page 418 of 520

418 5-2. Steps to take in an emergency
Stop the vehicle immediately.The following warning indicates the possibility of damage to the vehi-
cle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Toyota dealer.
Have the vehicle inspected by your Toyota dealer immediately.Failure to investigate the cause of the following warnings may lead to
the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Toyota dealer immediately.
Warning lightWarning light/Details
12-volt battery chargi ng system warning light
Indicates a malfunction in the vehicle’s 12-volt battery
charging system.
Warning lightWarning light/Details
SRS warning light
Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or
• The seat belt pretensioner system.
“ABS” warning light
Indicates a malfunction in:
• The ABS;
• The brake assist system.
Electric power steering system warning light (warning
buzzer) Indicates a malfunction in the EPS (Electric Power Steer-
ing) system
Slip indicator light
Indicates a malfunction in:
• The VSC;
• The TRAC;
• The hill-start assist control
Page 419 of 520

5
When trouble arises
419
5-2. Steps to take in an emergency
Follow the correction procedures.
After taking the specified steps to correct the suspected problem,
check that the warning light goes off.
(Yellow) Brake system warning light
Indicates a malfunction in:
• The regenerative brake system; or
• The electronically controlled brake system
(Flashing) Cruise control indicator light
Indicates a malfunction in the cruise control system
Warning lightWarning light/DetailsCorrection procedure
Open door warning light
(warning buzzer)*
1
Indicates that a door or
the trunk is not fully
closed Check that all the doors
are closed.
SOC (State of Charge)
warning light The amount of charge
remaining in the traction
battery has fallen to the
SOC gauge’s 2 lowest
segments Charge the vehicle.
(Yellow) Plug-in indicator
Indicates a malfunction
with the charging cable. Reconnect the charging
cable.
If the warning light
does not go off even
after reconnecting the
charging cable, contact
your Toyota dealer.
Warning lightWarning light/Details