2010 TOYOTA HIGHLANDER HYBRID ECU

445
4-3. Do-it-yourself maintenance
4
Maintenance and care
■
Checking 12-volt battery fluid
Check that the level is between
“UPPER LEVEL” and “LOWER
LEVEL”.
“UPPER LEVEL”
“LOWER LEVEL”
If the fluid level is at or below
“LOWER LEVEL”, add distilled
water.
■Adding distilled water
Low
O. K.
Remove the vent plug.
Add distilled water.
If the “UPPER LEVEL” line cannot be seen, check the fluid level by
looking directly at the cell.
Put the vent plug back on and close securely.
■ Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, 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.
STEP1
STEP2
STEP3

473
4-3. Do-it-yourself maintenance
4
Maintenance and care
24 ECU-B
10 ASteering sensor, gauges and
meters, air conditioning system,
main body ECU, wireless remote
control, smart key system, power
back door, on-board diagnosis sys-
tem
25 DOME 10 AVanity lights, personal lights, inte-
rior light, gauges and meters, door
courtesy lights, power back door
26 AMP 15 A Audio system
27 TOWING 30 A Trailer lights
28 IG2 25 A INJ NO.1, INJ NO.2
29 STR LOCK 20 A Steering lock system
30 IGCT 30 AIGCT No.2, IGCT No.3, INV-W/P,
EFI NO.3
31 HAZ 15 A Turn signal lights
32 ABS NO.3 15 AElectronically controlled brake sys-
tem
33 ABS NO.2 10 AElectronically controlled brake sys-
tem
34 ABS NO.1 10 A Capacitor
35 OIL PMP 10 A Transaxle fluid cooling system
36 BATT FAN 15 A Hybrid system
37 G/H 10 AGlass hatch, multiplex communica-
tion system
38 DC/DC-S 10 A Hybrid system
39 AM2 7.5 A Multiplex communication system
40 H-LP LH 15 A Left-hand headlight (high beam)
41 H-LP RH 15 A Right-hand headlight (high beam)
42 H-LP LL 15 A Left-hand headlight (low beam)
FuseAmpereCircuit

476 4-3. Do-it-yourself maintenance
12 A/C NO.110 A Air conditioning system
13 FUEL OPN 7.5 A Fuel filler door opener
14 S/ROOF 30 A Electric moon roof
15 TAIL 15 AParking lights, tail lights, license
plate lights, front fog lights, trailer
lights
16 PANEL 7.5 AGlove box light, emergency flash-
ers, audio system, outside rear
view mirror defoggers, power door
lock system, seat heaters, rear
seat entertainment system, instru-
ment panel light control dial, elec-
tronic controlled transmission
switch, transmission, steering
switches
17 ECU IG NO.1 10 A Multiplex communication system,
electric moon roof, electronically
controlled transmission system,
power back door, seat heaters, tire
pressure warning system, elec-
tronic power steering, transmission
18 ECU IG NO.2 7.5 A VDIM
19 A/C NO.2 10 AAir conditioning system, FAN NO.1,
FAN NO.2
20 WASH 20 A Windshield wipers and washer
21 S-HTR 20 A Seat heaters
22 GAUGE NO.1 10 A Audio system, outside rear view
mirror defoggers, back-up lights,
charging system, emergency flash-
ers, traction control system, instru-
ment panel light control dial,
windshield wiper deicer
23 FR WIP 30 A Windshield wipers and washer
FuseAmpereCircuit

477
4-3. Do-it-yourself maintenance
4
Maintenance and care
24 RR WIP
15 A Rear window wiper and washer
25 IGN 10 AMultiport fuel injection system/
sequential multiport fuel injection
system, steering lock system,
smart key system, SRS airbag sys-
tem
26 GAUGE NO.2 7.5 A Gauges and meters, rear view
monitor
27 ECU-ACC 7.5 A Power rear view mirrors, shift lock
system, smart key system
28 ACC SOCK
NO.1 10 A Power outlet
29 ACC SOCK
NO.2 20 A Power outlet
30 RADIO NO.2 7.5 A Audio system, rear seat entertain-
ment system, charging system,
interior lights, personal lights
31 MIR HTR 15 A Outside rear view mirror defoggers
FuseAmpereCircuit

489
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■
Replacing light bulbs
●Turn off the headlights. Do not attempt to replace the bulb immediately
after turning off the headlights.
The bulbs become very hot and may cause burns.
● Do not touch the glass portion of the light bulb with bare hands. Hold the
bulb by the plastic or metal portion.
If the bulb is scratched or dropped it may blow out or crack.
● Fully install light bulbs and any parts used to secure them. Failing to do so
may result in heat damage, fire, or water entering the headlight unit. This
may damage the headlights or cause condensation to build up on the lens.
■ To prevent damage or fire
Make sure bulbs are fully seated and locked.

494 5-1. Essential information
Emergency towingIf a tow truck is not available, in an emergency your vehicle may be
temporarily towed using a cable or chain secured to the emergency
towing eyelet(s). This should only be attempted on hard surfaced
roads for short distances below 18 mph (30 km/h).
A driver must be in the vehicle to steer and operate the brakes. The
vehicle’s wheels, drive train, axles, steering and brakes must be in
good condition.
Towing eyelets
■Emergency towin g procedure
Release the parking brake.
Shift the shift lever to N.
Turn the “POWER” switch to ACCESSORY (hybrid system off)
mode or ON (hybrid system operating) mode.
CAUTION
■ Caution while towing
●Use extreme caution when towing the vehicle.
Avoid sudden starts or erratic driving maneuvers which place excessive
stress on the emergency towing eyelet and the cables or chains.
● If the hybrid system is off, the power assist for the brakes and steering will
not function, making steering and braking more difficult.
STEP1
STEP2
STEP3

5
When trouble arises
495
5-1. Essential information
Installing towing eyelet
Remove the eyelet cover while
pushing it.
Insert the towing eyelet into the
hole and tighten partially by
hand.
Tighten down the towing eyelet
securely using a wheel nut
wrench.
NOTICE
■To prevent causing serious dama ge to the transmission
Never tow this vehicle from the rear with the front wheels on the ground.
This may cause serious damage to the transmission.
STEP1
STEP2
STEP3

496 5-1. Essential information
■Location of the emer gency towing eyelet
P. 512
CAUTION
■ Installing towing eyelet to the vehicle
Make sure that towing eyelet is installed securely.
If not securely installed, towing eyelet may come loose during towing. This
may lead to accidents that cause serious injury or even death.