2004 TOYOTA PRIUS auxiliary battery

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Toyota hybrid system combines a gaso-
line engine and electric motor power to
improve the fuel economy and minimize
the emissions as well as to provide
better power performance than the ordi-
nary gasolinepowered vehicles.
Depending on the driving condition, the
vehicle runs on the best combination of;
Gasoline engine power
Electric motor power generated by
the gasoline engine
Electric motor power of the hybrid
vehicle battery
Furthermore, the energy is efficiently used
in the following ways:
When stopping the vehicle, the gaso-
line engine is automatically stopped.
When applying the brakes or decelerat-
ing, electricity is converted from the
turning force of the wheels and stored
in the hybrid vehicle battery. (This is
called regenerative brake.)
Since the battery is charged by the
gasoline engine as needed, it does not
require charging from an outside
source like an electric vehicle.
If you do not use the vehicle for a
long time (2 weeks or more), the hy-
brid vehicle battery and auxiliary battery
will discharge and their condition is li-
able to decline. Therefore, in order to
make up for discharging, charge them
once in every 2 weeks for about 30
minutes by starting the hybrid system
with all electrical components turned off.Basic operations are described below. Be-
sides, Toyota hybrid system performs vari-
ous controls depending on the operating
condition: The “Energy Monitor” screen
tells you which power is used currently.
Toyota hybrid system Toyota hybrid system
operating condition

13
These high voltage parts or cables
consisting of an electromagnetic
shielding structure produce relatively
the same amount of electromagnetic
waves as conventional gasoline
fueled vehicles or home electric ap-
pliances.
As unwanted noise may occur in the
reception of mobile radios, contact
your Toyota dealer for installation or
removal.
Always keep your hybrid vehicle’s driv-
ing characteristics in mind.
CAUTION
The driver should pay full attention
around the vehicle especially when it
is driven only by the electric motor
(with the gasoline engine stopped).
People in the immediate area might
misjudge the hybrid vehicle move-
ment based on the absence of the
regular engine noise.
When the hybrid system is started or
stopped, you may hear a sound coming
from the hybrid vehicle battery in the
luggage compartment. However, this
does not indicate any trouble.
As the vehicle runs with both the gaso-
line engine and electric motor, you may
hear a motor sound coming from the
engine compartment.
If the “READY” light is on, you can
start even though the gasoline engine
may be off.
When you shift the shift lever to “B”
and release it to its original position
and your foot from the accelerator ped-
al, engine braking will be applied. How-
ever, during high speed driving you
may feel that deceleration by engine
braking is less than that of ordinary
vehicle.
Be sure to put the hybrid transaxle in
“P” when parking.
In “N”, the hybrid vehicle battery assembly
is not charged, even if the gasoline en-
gine is operating. You cannot run your
vehicle if the hybrid transaxle is left in “N”
for a long time because the hybrid vehicle
battery assembly will be discharged. When you leave your vehicle, apply the
parking brake to put the hybrid trans-
axle in “P” and be sure to carry the
key with you and lock all the doors.
If you leave the hybrid system in “ACC”
or “IG
−ON”, the hybrid system may not
start because the auxiliary battery will be
discharged.
CAUTION
When you leave your vehicle, be
sure to shut off the hybrid system.
Be sure to put the hybrid transaxle
in “P” because the vehicle can start
with the “READY” light on and the
engine stopped (no engine sound
and vibration). When the “READY”
light is on, if you leave your ve-
hicle in shift position other than
“P” and “N”, the vehicle will creep
and start abruptly with the accelera-
tor pedal being depressed by mis-
take. This may cause death or seri-
ous injury.

40
12p033
When closing the back door, the inside
handle can be used to make the reach
easier.
See “Cargo and luggage” on page 224 for
precautions to observe when loading lug-
gage.
To close the back door, lower it and press
down on it. After closing the back door,
try pulling it up to make sure it is secure-
ly closed.
CAUTION
Keep the back door closed while driv-
ing. This not only keeps the luggage
from being thrown out, but also pre-
vents exhaust gases from entering
the vehicle.
If the auxiliary battery is disconnected
or run down, the back door will be auto-
matically locked and the back door system
may not work after you reconnect, replace
or recharge the auxiliary battery. In any of
these cases, normalize the back door sys-
tem by following procedure.
1. Unlock the back door with the remote control key or power door lock switch.
2. Close the back door completely by hand.
If the back door system does not operate
properly after the above procedure, there
may be a problem in the system. Contact
your Toyota dealer.
21p019a
The windows can be operated with the
switch on each door.
The power windows work when the “IG −
ON” mode is enabled.
Key off operation : If both front doors are
closed, they work for 45 seconds even
after the hybrid system is stopped. They
stop working when either front door is
opened.
OPERATING THE DRIVER’S WINDOW
Use the switch on the driver’s door.
Normal operation : The window moves as
long as you hold the switch.
To open: Lightly push down the switch.
To close: Lightly pull up the switch.
Power windows

41
21p020b
Automatic operation: Push the switch
completely down or pull it completely up,
and then release it. The window will fully
open or close. To stop the window part-
way, lightly move the switch in the oppo-
site direction and then release it.
Jam protection function: If something
gets caught between the window and win-
dow frame during automatic closing opera-
tion or key off closing operation, the win-
dow stops and opens halfway.
If the window receives a strong impact,
this function may work even if nothing is
caught. If the auxiliary battery is disc
onnected
or run down, the power window may not
operate automatically and the jam protec-
tion function will not function correctly af-
ter you reconnect, replace or recharge the
auxiliary battery. In any of these cases,
you should normalize the power window.
To normalize the power window:
1. Push down the power window switch and lower the window halfway.
2. Pull up the switch until the window closes and hold the switch for a sec-
ond.
Make sure that the window opens and
closes automatically. If the power window
cannot be operated properly, have it
checked by your Toyota dealer.
CAUTION
Never try jamming any part of your
body to activate the jam protection
function intentionally.
The jam protection function may
not work if something gets caught
just before the window is fully
closed.
21p021b
Window lock
switch
OPERATING THE PASSENGERS’
WINDOWS
Use the switch on each passenger ’s
door or the switches on the driver ’s
door that control each passengers’ win-
dow.
The window moves as long as you hold
the switch.
To open: Push down the switch.
To close: Pull up the switch.
If you push in the window lock switch on
the driver ’s door, the passengers’ windows
cannot be operated.

45
The indicator light will come on when all
the doors and hood are closed and
locked.
The system will automatically be set after
30 seconds. When the system is set, the
indicator light will start flashing again.4. After making sure the indicator light starts flashing, you may leave the ve-
hicle.
Never leave anyone in the vehicle when
you set the system, because unlocking
from the inside will activate the system.
WHEN THE SYSTEM IS SET
Activating the system
The system will sound the alarm under
the following conditions:
If any of the doors is unlocked or if
the hood is forcibly opened without the
mechanical key, wireless remote control
transmitter or smart function.
If the battery terminal is disconnected
and then reconnected.
The indicator light will come on when the
system is activated. If any of the doors are unlocked without
the mechanical key, wireless remote con-
trol transmitter or smart function and the
key is not in the key slot, all the doors
will be automatically locked again.
After 1 minute, the alarm will automatically
stop and the indicator light will starts
flashing again.
Reactivating the alarm
Once set, the system automatically resets
the alarm after the alarm stops.
The alarm will activate again under the
same circumstances described in
“Activating the system”.
Stopping the alarm
The alarm will be stopped by the following
two ways:
Turn the hybrid system to “IG
−ON”.
Unlock any of the doors with the me-
chanical key, wireless remote control
transmitter or smart function.
If the auxiliary battery becomes dis-
charged due to the vehicle being unused
for a long time, etc., when the battery is
recharged or replaced, the system will
sound the alarm. If this happens, immedi-
ately stop the alarm. CANCELLING THE SYSTEM
The system will be cancelled by the
above mentioned two ways.
If the tail lights come on for 2 seconds,
the theft deterrent system has been
alarmed. Check to see if there is any
abnormality on your vehicle.
TESTING THE SYSTEM
1. Open all the windows.
2. Set the system as described above. The doors should be locked with the
mechanical key, wireless remote control
transmitter or smart function. Be sure
to wait until the indicator light goes off
or starts flashing.
3. Unlock any door from the inside. The system s hould activate the alarm.
4. Stop the alarm as described above.
5. Repeat this operation for the other doors and hood. When testing the back
door, also check that the system is
activated when the auxiliary battery ter-
minal is disconnected and then recon-
nected. When testing the hood, release
the lock with the hood lock release
lever and raise the hood.
If the system does not work properly,
have it checked by your Toyota dealer.

11 4
24p001b
The gauge indicates the approximate
quantity of fuel remaining in the tank
when the “IGON” mode is enabled.
Nearly full–Indicator at “F”
Nearly empty–Indicator at “E”
It is a good idea to keep the tank over
1/4 full.
When you refuel on a slope, the indicator
may not show the correct level.
When you refuel less than about 11.4 L
(3.0 gal., 2.5 lmp. gal.), the fuel indicator
may not change.
After the auxiliary battery is reconnected,
one segment will flash for a while.Depending on the ambient temperature,
the fuel quantity is less than 45 L (11.9
gal., 9.9 lmp. gal.) even at “F”. However,
this does not affect the fuel consumption
and the remaining fuel ratio indicated on
the gauge. (For details, see “Fuel” on
page 202.)
If the fuel gauge display flashes, there
may be a problem in the system. In this
case, contact your Toyota dealer as soon
as possible.
24p002b
Low fuel level indicator light
Blink
If the fuel level approaches “E” or the low
fuel level indicator light blinks, fill the fuel
tank as soon as possible.
Fuel gauge

126
(a) Discharge Warning Light
This light warns that the auxiliary battery
is being discharged.
If it comes on while you are driving, there
is a problem somewhere in the charging
system.
The hybrid system will continue to oper-
ate, however, until the auxiliary battery is
discharged. Turn off the air conditioning,
blower, radio, etc., and drive directly to
the nearest Toyota dealer or repair shop.(b) Low Engine Oil Pressure Warning
Light
This light warns that the engine oil pres-
sure is too low.
If it stays on while you are driving, pull
off the road to a safe place and stop the
engine immediately. Call a Toyota dealer
or qualified repair shop for assistance.
The light may come on when the oil level
is extremely low. It is not designed to
indicate low oil level, and the oil level
must be checked using the level dipstick.
NOTICE
Do not drive the vehicle with the
warning light on—even for one block.
It may ruin the engine.
(c) High Coolant Temperature Warning Light
The light operates to warn that the hybrid
system is almost over heating.
If it comes on while you are driving, stop
the vehicle and check your hybrid system.
For detailed instructions, see “If your ve-
hicle overheats” on page 242.
Your vehicle may overheat during severe
operating conditions, such as:
Driving up a long hill on a hot day.
Reducing speed or stopping after high
speed driving.
NOTICE
 Do not remove the thermostat in
the cooling system as this may
cause the hybrid system to over-
heat. The thermostat is designed to
control the flow of coolant to keep
the temperature of the hybrid sys-
tem within the specified operating
range.
 Continued driving with the light on
could result in the overheating of
hybrid system.

132
NOTICE
The hybrid system cannot be
started when the shift position is in
“N”. Be sure to put it in “P” and
then start the system.
 Do not leave the hybrid system in
“ACC” or “IGON” for a long time.
The auxiliary battery will discharge.
 The hybrid mode in which the bat-
tery is discharged or disconnected
is retained in memory, and that
mode is turned on when power is
applied.
25p105
Without depressing the brake pedal
Carrying a smart key allows you to op-
erate the “POWER” switch without the
key being inserted into the key slot.
Each time you press the “POWER”
switch briefly without the brake pedal
depressed, the hybrid system mode
changes in the order of “OFF”, “ACC”,
“IGON” and then back to “OFF”.
The smart function can be set to become
inoperative using the smart cancel switch.
For details, see “Deactivating the smart
function” on page 32. 1) “ACC” (Green indicator is turned on)
Accessories such as the radio operate.
Pressing the “POWER” switch briefly with-
out depressing the brake pedal in the
“OFF” mode turns on this mode.
In the “ACC” mode, pressing the “POW-
ER” switch briefly while depressing the
brake pedal will start the hybrid system.
If you leave your vehicle in the “ACC”
mode for about an hour, the hybrid system
is automatically turned off.
2) “IGON” (Amber indicator is turned
on)
All accessories are operable.
Pressing the “POWER” switch briefly with-
out depressing the brake pedal in the
“ACC” mode turns on this mode.
In the “IG
−ON” mode, pressing the “POW-
ER” switch briefly while depressing the
brake pedal will start the hybrid system.
3) “OFF” (Indicator is turned off)
The hybrid system is off.
You may hear a motor sound in the en-
gine compartment for a few seconds after
the system is turned off and about 90
seconds have passed.
—with smart function
(on some models)