Toyota Yaris: Keys / Keyless Entry System
This system uses the key buttons to remotely lock and unlock
the doors and the liftgate, and opens the trunk lid.
The system can start the engine without having to take the key
out of your purse or pocket.
It can also help you signal for attention.
Operating the theft deterrent system is also possible on theft deterrent
system-equipped vehicles.
Press the buttons slowly and carefully.
System malfunctions or warnings are indicated by the following warning lights
or beeps.
- KEY Warning Light (Red)
Refer to Warning/Indicator Lights.
- Ignition Not Switched Off (STOP) Warning Beep
Refer to Ignition Not
Switched Off (STOP) Warning Beep.
- Key Removed from Vehicle Warning Beep
Refer to Key Removed from Vehicle
Warning Beep.
If you have a problem with the key, consult your Toyota dealer.
If your key is lost or stolen, consult your Toyota dealer as soon as possible
for a replacement and to make the lost or stolen key inoperative.
- The keyless entry system operation may vary due to local conditions.
- The keyless entry system is fully operational (door/liftgate lock/unlock)
when
the ignition is switched off. The system does not operate if the ignition is
switched to any position other than off.
- If the key does not operate when pressing a button or the operational
range
becomes too small, the battery may be dead. To install a new battery, refer
to Key Battery Replacement.
- Battery life is about one year. Replace
the battery with a new one if the KEY
indicator light (green) flashes in the combination meter. Replacing the
battery
about once a year is recommended
because the KEY warning light/indicator
light may not illuminate or flash depending on the rate of battery depletion.

Additional keys can be obtained at your Toyota dealer. Up to 6 keys can be
used with the keyless functions per vehicle. Bring all keys to your Toyota
dealer when additional keys are required.
NOTICE
Radio equipment like this is governed by laws in the United States.
Changes or modifications not expressly approved by the party
responsible
for compliance could void the user’s authority to operate the equipment.
Smart key
Auxiliary key
Key code number plate
To use the auxiliary key, press the knob and pull out the auxiliary key
from the smart key.
A code number is stamped on the plate attached to the key set;
detach this plate and store it in a safe place (not in the vehicle) for use
if you need to make a replacement key (auxiliary key)...
Operation indicator light
Operation buttons
The operation indicator light
flashes when the buttons are
pressed.
Lock button
To lock the doors and the liftgate, press the lock button and
the hazard warning lights will
flash once...
Other information:
PARTS LOCATION ILLUSTRATION
*1 SEMICONDUCTOR POWER INTEGRATION ECU *2 NO. 1 ENGINE ROOM RELAY BLOCK - STD P/I NO. 1 FUSE - INP STD NO. 1-1 FUSE ILLUSTRATION
*1 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *2 POWER DISTRIBUTION BOX ASSEMBLY - ECU-IGR NO...
DESCRIPTION Problem Symptom Suspected Area Trouble Area
Engine does not crank
Engine cranks slowly
Auxiliary battery depletion
Starter malfunction
Starter system
Auxiliary battery depletion
Starter malfunction
Starter circuit
Excessive engine friction Engine Engine assembly
Starting time is long
Engine speed fluctuation due to abnormal combustion
Idle speed too low or high
The engine stalls immediately after starting
Strong engine vibration due to above symptoms
Ignition malfunction
Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply)
Insufficient compression
Changes in load from another system
Ignition system
Spark plug
Ignition coil assembly
Fuel system
Direct fuel injector assembly
Port fuel injector assembly
Fuel pump assembly (for high pressure side)
Fuel pump (for low pressure side)
Fuel pump control circuit
Fuel suction plate sub-assembly
Fuel main valve assembly
Fuel line
Purge VSV system
Fuel quality (existence of foreign matter, degradation)
Intake and exhaust systems
Mass air flow meter sub-assembly
Intake system
(Air leaks or deposit accumulation)
Throttle body with motor assembly
Air fuel ratio sensor (sensor 1)
Air fuel ratio sensor (sensor 2)
Cam timing oil control solenoid assembly
Variable Valve Timing system (VVT system)
Other control systems
ECM
Wire harness or connector
Knock control sensor
Engine coolant temperature sensor
Immobiliser system
Engine
Water control valve
Engine assembly
Crankshaft position sensor
High load from another system
Air conditioning system
Power steering system
Electrical load signal system
SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION HINT: The following are descriptions of the characteristics of each system malfunction...