2014 TOYOTA SIENNA ECU

662 4-2. Maintenance
SIENNA_OM_OM45483U_(U)
ItemsCheck points
Indicators/buzzers • Do the indicators and buzzers
function properly?
Lights • Do all the lights come on?
• Are the headlights aimed cor-
rectly?
Parking brake • Does the parking brake lever or
pedal move smoothly?
• When parked on a slope with the parking brake on, is the vehicle
securely stopped?
Seat belts • Do the seat belts operate
smoothly?
• The seat belts should not be dam- aged.
Seats • Do the seat controls operate
properly?
Steering wheel • Does the steering wheel rotate
smoothly?
• Does the steering wheel have the correct amount of free play?
• There should not be any strange sounds coming from the steering
wheel.

670 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
CAUTION
■Pre-driving check
Check that the hood is fully closed and locked.
If the hood is not locked properly, it may open while the vehicle is in motion
and cause an accident, which may result in death or serious injury.
■ After installing the support rod into the slot
Make sure the rod supports the hood securely from falling down on to your
head or body.
NOTICE
■When closing the hood
Be sure to return the support rod to its clip before closing the hood. Closing
the hood with the support rod up could cause the hood to bend.

717
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
FuseAmpereCircuit
32 ALT 140 A Charging system, horn, left-hand
headlight (low beam), right-hand
headlight (low beam), fog light, out-
side rear view mirror heaters, rear
window defoggers, windshield
wiper de-icer
33 RAD NO.1 15 A Audio system
34 DOME 7.5 AVanity lights, personal/interior
lights, personal lights, engine
switch light, rear ceiling lights, door
courtesy lights, luggage compart-
ment light, gauges and meters,
clock
35 ECU-B 10 AMain body ECU, smart key system,
wireless remote control, power
back door, power sliding door, rear
view monitor, multi information dis-
play, power window, outside rear
view mirror control, steering angle
sensor, auto-anti glare inside rear
view mirror, AUTO ACCESS SEAT
remote control, front passenger
occupant classification system
36 ETCS 10 AMultiport fuel injection system/
sequential multiport fuel injection
system
37 A/F 20 AMultiport fuel injection system/
sequential multiport fuel injection
system
38 STRG LOCK
*420 A Steering lock system
39 ALT-S 7.5 A Charging system

718 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
*1: Vehicles with discharge headlights only
*2: Vehicles without discharge headlights only
*3: Vehicles without a smart key system only
*4: Vehicles with a smart key system only
FuseAmpereCircuit
40 INJ 25 A Multiport fuel injection system/
sequential multiport fuel injection
system, “IG NO.2” and “IG2” fuses
41 ECU-B NO.2 7.5 A Air conditioning system
42 AM2 NO.2
*47.5 A Multiplex communication system,
starting system
43 EFI NO.1 25 A Multiport fuel injection system/
sequential multiport fuel injection
system, “ECT” and “EFI NO.2”
fuses
44 SMART
*45 A Smart key system
45 DRL 30 A Daytime running light system, “H-
LP LH (HI)” and “H-LP RH (HI)”
fuses
46 EPS 60 A Electric power steering

719
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
■
Under the driver’s side instrument panel
FuseAmpereCircuit
1P/OUTLET15 APower outlets
2 RAD NO.2 7.5 A Audio system, navigation system,
rear seat entertainment system
3 ECU-ACC 10 A Main body ECU, clock, shift lock
system, power rear view mirror
control, multiplex communication
system
4 CIG 15 A Power outlets
5 GAUGE NO.1 10 A Emergency flashers, back up
lights, navigation system, multi
information display, automatic tran-
saxle, multiport fuel injection sys-
tem/sequential multiport fuel
injection system, charging system

720 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
FuseAmpereCircuit
6 ECU-IG NO.1 10 A Multiplex communication system,
stop lights, navigation system,
vehicle stability control system,
Active Torque Control 4WD, intui-
tive parking assist, auto anti-glare
inside rear view mirror, pre-collision
seat belt, outside rear view mirror,
seat heater, TPMS, yaw rate & G
sensor, steering angle sensor,
AUTO ACCESS SEAT, main body
ECU, Blind Spot Monitor
7 P/W RL 20 A Rear power windows (left-side)
8 D/L 15 A Power door lock system
9 P/SEAT FR 30 A Power front seat (right-side)
10 S/ROOF 30 A Moon roof 11 P/W RR 20 A Rear power windows (right-side)
12 P/W FR 20 A Front power windows (right-side)
13 P/SEAT FL 30 A Power front seat (left-side), driving
position memory system
14 STOP 10 A Stop lights, ABS, vehicle stability
control system, rear combination
light, high mounted stop light, auto-
matic transaxle, shift lock system,
multiplex communication system,
power third seat switch, multiport
fuel injection system/sequential
multiport fuel injection system,
trailer lights (stop lights)
15 P/W FL 20 A Front power windows (left-side)

722 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
FuseAmpereCircuit
22 TAIL 10 A Tail lights, trailer lights (tail lights),
license plate light, rear combination
lights
23 WIP ECU 7.5 A Windshield wiper and rear window
wiper
24 P/VENT 15 A Power quarter windows
25 AFS 10 A Automatic High Beam
26 WIP 30 A Windshield wiper
27 WASHER 20 A Windshield washer
28 WIP RR 20 A Rear window wiper
29 WASHER RR 15 A Rear window washer
30 HTR-IG 10 A Air conditioning system
31 SHIFT LOCK 7.5 A Shift lock system, multiport fuel
injection system/sequential multi-
port fuel injection system
32 ECU-IG NO.2 10 A Pre-collision system, pre-collision
seat belt, dynamic radar cruise
control, electric power steering,
rain-sensing windshield wipers,
driving position memory system,
power sliding door, power third
seat, power back door, multiplex
communication system
33 PSD RH 25 A Power sliding door (right-side)
34 OBD 7.5 A On-board diagnosis system
35 S-HTR FL 15 A Seat heater (left-side)
36 S-HTR FR 15 A Seat heater (right-side)

729
4-3. Do-it-yourself maintenance
4
Maintenance and care
SIENNA_OM_OM45483U_(U)
■
Rear turn signal lights
Remove the securing bolts and
remove the unit.
Turn the bulb base counterclock-
wise.
Remove the light bulb.
STEP1
STEP2
Gasket
STEP3