2012 TOYOTA MATRIX ECU

391
4-3. Do-it-yourself maintenance
4
Maintenance and care
■
Under the driver’s side instrument panel
FuseAmpereCircuit
1 TAIL 10 A Parking lights, tail lights, license
plate lights, multiport fuel injection
system/sequential multiport fuel
injection system, instrument cluster
lights
2 PANEL 7.5 A Switch illumination
3 FR DOOR 20 A Power windows, electric moon roof
4 RL DOOR 20 A Power windows
5 RR DOOR 20 A Power windows
6 SUNROOF 20 A Electric moon roof
7 CIG 15 A Cigarette lighter, power outlet
8 ACC 7.5 A Outside rear view mirrors, audio
system, main body ECU, clock,
shift lock control system
9 MIR HTR 10 A Multiport fuel injection system/
sequential multiport fuel injection
system, outside rear view mirror
heaters
10 PWR OUTLET 15 A No circuit

392 4-3. Do-it-yourself maintenance
11 IGN7.5 ASRS airbag system, multiport fuel
injection system/sequential multi-
port fuel injection system, front
passenger occupant classification
system
12 METER 7.5 A Gauge and meters
13 HTR-IG 10 AAir conditioning system, rear win-
dow defogger, PTC heater
14 WIPER 25 A Windshield wipers
15 RR WIPER 15 A Rear window wiper
16 WASHER 15 A Windshield washer
17 ECU-IG NO. 1 10 A Main body ECU, electric power
steering, electric cooling fan(s),
shift lock control system, anti-lock
brake system, multiport fuel injec-
tion system/sequential multiport
fuel injection system, tire pressure
warning system, vehicle stability
control system, all wheel drive sys-
tem
18 ECU-IG NO. 2 10 A Back-up lights, charging system,
rear window defogger, auto anti-
glare inside rear view mirror
19 OBD 7.5 A On-board diagnosis system
20 STOP 10 AStop lights, high mounted stop-
light, anti-lock brake system, vehi-
cle stability control system,
multiport fuel injection system/
sequential multiport fuel injection
system, shift lock control system
21 DOOR 25 A Power door lock system
22 ACC-B 25 A CIG, ACC
23 4WD 7.5 A All wheel drive system
FuseAmpereCircuit

402 4-3. Do-it-yourself maintenance
■Condensation build-up on th e inside of the lens
Contact your Toyota dealer for more information in the following situations.
Temporary condensation build-up on the inside of the headlight lens does
not indicate a malfunction.
● Large drops of water are built up on the inside of the lens.
● Water has built up inside the headlight.
■ Removing and installing the fender liner clip
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.
Removing
Installing

406 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. This should only be attempted on hard surfaced roads
for short distances at low speeds.
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.
1.8 L 4-cylinder (2ZR-FE) engine Towing eyelet
2.4 L 4-cylinder (2AZ-FE) engine Towing eyelet

5
When trouble arises
415
5-2. Steps to take in an emergency
(U.S.A.)
(Canada) ABS warning light
Indicates a malfunction in:
•ABS; or
• The brake assist system.
Electric power steering system warning light (warning
buzzer)
Indicates a malfunction in the EPS system.
Slip indicator light
Indicates a malfunction in:
• The VSC system; or
• The TRAC system.
(Flashes) Cruise control indicator light (if equipped)
Indicates a malfunction in the cruise control system.
(AWD models) Active Torque Control 4WD system warning light
Indicates a malfunction in the Active Torque Control 4WD
system.
■ If the malfunction indicator lamp comes on while driving
First check the following:
● Is the fuel tank empty?
If it is, fill the fuel tank immediately.
● Is the fuel tank cap loose?
If it is, tighten it securely.
The malfunction indicator lamp will go off after taking several driving trips.
If the malfunction indicator lamp does not go off even after several trips, con-
tact your Toyota dealer as soon as possible.
Warning lightWarning light/Details

5
When trouble arises
419
5-2. Steps to take in an emergency
■
SRS warning light
This warning light system monitors the airbag sensor assembly, front airbag
sensors, side and curtain shield airbag sensors, curtain shield airbag sen-
sors, driver's seat position sensor, driver's seat belt buckle switch, front pas-
senger occupant classification system (ECU and sensors), “AIR BAG ON”
indicator light, “AIR BAG OFF” indicator light, front passenger's seat belt
buckle switch, seat belt pretensioners and force limiters, airbags, intercon-
necting wiring and power sources. ( P. 73)
■ Front passenger detection sensor and passenger seat belt reminder
● If luggage is placed on the front passenger seat, the front passenger
detection sensor may cause the warning light to flash, even if a passen-
ger is not sitting in the seat.
● If a cushion is placed on the seat, the sensor may not detect a passen-
ger, and the warning light may not operate properly.
■
When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level.
Pushing the tire pressure warning reset switch does not turn off the tire
pressure warning light.
■The tire pressure warning light may turn on due to natural causes
The tire pressure warning light may turn on due to natural causes such
as natural air leaks or tire inflation pressure changes caused by temper-
ature. In this case, adjusting the ti re inflation pressure will turn off the
warning light (after a few minutes).
■When a tire is replaced with a spare tire
The compact spare tire is not equipped with the tire pressure warning
valve and transmitter. If a tire goes flat, the tire pressure warning light will
not turn off even though the flat tire is replaced with the spare tire.
Replace the spare tire with the repair ed tire and adjust the proper tire
inflation pressure. The ti re pressure warning light will turn off after a few
minutes.

426 5-2. Steps to take in an emergency
Taking out the spare tireTurn the knobs to the “UNLOCK”
position and remove the deck
boards.
Loosen the center fastener that
secures the spare tire.
STEP1
STEP2

5
When trouble arises
433
5-2. Steps to take in an emergency
Pull the ends of the belts to
secure the tire.STEP6
■The compact spare tire
●The compact spare tire is identifi
ed by the label “TEMPORARY USE
ONLY” on the tire sidewall.
Use the compact spare tire temporarily only in an emergency.
●Make sure to check the tire pre ssure of the compact spare tire.
(  P. 467)
■If you have a flat front tire on a road covered with snow or ice
Install the compact spare tire on the rear of the vehicle. Perform the fol-
lowing steps and fit tire chains to the front tires.
Replace a rear tire with the compact spare tire.
Replace the flat front tire with the tire removed from the rear of
the vehicle.
Fit tire chains to the front tires.
■After completing the tire change (vehicles with tire pressure warn-
ing system)
The tire pressure warning system must be reset. (P. 366)
■When using the compact spare tire
As the compact spare tire is not equipped with the tire pressure warning
valve and transmitter, low inflation pressure of the spare tire will not be
warned. Also, if you replace the compac t spare tire after the tire pressure
warning light comes on, the light remains on.
STEP1
STEP2
STEP3