2001 TOYOTA PRIUS key battery

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±209
2001 PRIUS (RM778U) MWU (H11±6)
GInverter, M±WU (I9±3)
MUU (H11±4)RInverter, M±UU (I9±1)
MVU (H11±5)WInverter, M±VU (I9±2)
MIVG (H11±26)BInverter, M±GINV (I9±6)
MIVA (H11±16)BInverter, M±IVA (I10±1)
MIVB (H11±7)WInverter, M±IVB (I10±3)
MIWB (H11±17)GInverter, M±IWB (I10±4)
VB (H11±20)YInverter, VB (I10±5)
MIWA (H11±25)RInverter, M±IWA (I10±2)
GIVA (H11±19)BInverter, G±IVA (I12±1)
GIVB (H11±8)WInverter, G±IVB (I12±3)
GIWB (H11±18)GInverter, G±IWB (I12±4)
GIWA (H11±28)RInverter, G±IWA (I12±2)
GSDN (H11±12)YInverter, G±SDOWN (I11±4)
GIT (H11±23)LInverter, G±INVT (I11±5)
GWU (H11±3)GInverter, G±WU (I11±3)
GVU (H11±2)WInverter, G±VU (I11±2)
GUU (H11±1)RInverter, G±UU (I11±1)
GIVG (H11±27)BInverter, G±GINV (I11±6)
MFIV (H11±14)BInverter, M±FINV (I10±8)
GSIV (H11±15)GInverter, G±SINV (I12±7)
GFIV (H11±24)BInverter, G±FINV (I12±8)
ETH+ (H14±28)PEngine ECU, ETH+ (E9±28)
ETH± (H14±27)LEngine ECU, ETH± (E9±27)
HTE+ (H14±19)YEngine ECU, H TE+ (E9±19)
HTE± (H14±29)BREngine ECU, H TE± (E9±18)
HTB+ (H14±20)LGBrake ECU, HVI+ (B10±24)
HTB± (H14±30)VBrake ECU, HVI± (B10±16)
BTH+ (H14±18)GBrake ECU, HVO+ (B10±14)
BTH± (H14±17)RBrake ECU, HVO± (B10±22)
FCVC (H14±7)B±WTransponder Key ECU, HEVC (T4±8)
CON1 (H12±13)VSystem Main Relay (S8±3)
CON2 (H12±2)GRSystem Main Relay (S8±4)
CON3 (H13±1)PSystem Main Relay (S8±5)
HTD+ (H13±2)WBattery ECU, HTD+ (B17±6)
HTD± (H13±20)BBattery ECU, HTD± (B17±7)
DTD+ (H13±19)RBattery ECU, DTD+ (B17±18)
DTD± (H13±18)GBattery ECU, DTD± (B17±19)

I15485
BatteryB9
BODY ECU
11
F112 5
6 3
2 15
1
11
1 WID2 2F
2K 2HTAIL
RELAY7.5A
TAIL Instrument Panel J/Bto Taillight
F18
FL BLock No. 2 FL Block No. 1LG LG
F13B±GTRLY
100A DC/DC 120A MAIN DI±696
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Taillight Relay Circuit
CIRCUIT DESCRIPTION
Taillight relay will be ºONº by operating the taillight switch. The transistor which activates the tail light relay
has two sorts: one activates by the tail light switch for fail safe and the other activates by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the taillight control relay ON and OFF, thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the taillight
control relay switches OFF, thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI6QY±04

I15484
2 3 66
8 7
1 4 2
1
4
3 2 1 1
11
1
710
883
A L D
FE
E
E
LE
ER±L
R±G
R±W
R±G R±W R±W R±W
R±G
R±G B±G
R±G B
F13 F12
2I
2A 1B1F
1F
1F3
ID2 IA2J20
J/C
IA1
J4J5
ID 2K 2A
15
17
BatteryC10 High Beam
Indicator Light
(Comb. meter) F18
FL Block No. 2
J11
J/CJ4 H2
Headlight RH
10A HEAD (LH) 10A HEAD (RH)
Short Pin HEAD RelayEngine Room J/BB9
Body ECU
Short Pin
120A MAIN
Instrument
Panel J/BJ12 J13
W±B
H1
Headlight
LH
1
FL Block No. 13
1
HRLY
Instrument
Panel J/B DI±698
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
Headlight Relay Circuit
CIRCUIT DESCRIPTION
Head light relay will be ºONº by operating the headlight switch. The transistor which activates the headlight
relay has two sorts: one activates directly by the headlight switch for fail safe and the other activates by CPU.
the one that activates by CPU has two systems and prevents the headlight from turning off at the time of
one system trouble in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the headlight control relay ON and OFF, thus flashing the
headlights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the head-
light control relay switches OFF, thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ±04

Mode Status
Error DB01 *2
(Communication
Control)Dual sound is detected.
Check harness for power supply
system of component shown by
auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code.
Transmission
Error DC 01 *4
(Communication
Control)Transmission to component shown
by auxiliary code has been failed.
(This code does not necessarily
mean actual failure.)If same component shown by auxil-
iary code is recorded in other com-
ponent(s), check harness for power
supply and communication system
of components shown sub code.
Slave Reset
(Momentary
Interruption) DE 01 *5
(Communication
Control)After engine start, slave component
has been disconnected.
DB
Check harness for power supply
system of component shown by
auxiliary code.

Check harness for communica-
tion system of component shown by
auxiliary code.
No response to
connection
checkComponent shown by auxiliary
code is or was disconnected from
system after engine is started.
Component operated (sound and/
or image was provided) before en-
gine stop is or was disconnected
with ignition switch in ACC or ON.
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown
by auxiliary code D8
D9 Last Mode
Error
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown
by auxiliary code 01 *3
(Communication
Control)
01 *2
(Communication
Control)
Multiple Frame
Abort E4 01 *1
(Communication
Control)Since this DTC is provided for engi-
neering, it may be detected when
no actual failure exists. Multiple frame transmission is
aborted. Registered
component
disconnectedComponent shown by auxiliary
code is or was disconnected from
system with ignition switch in ACC
or ON.
Communication with component
shown by auxiliary code is not es-
tablished when engine is started.
Check harness for power supply
of component shown by auxiliary
code

Check harness for communica-
tion system of component shown by
auxiliary code D5 01 *2
(Communication
Control)
No Response
to ON/OFF
Instruction DA 01
(Communication
Control)No response is identified when
changing mode (audio and visual
mode change). Detected when
sound and picture does not change
by button operation.
Check harness for power supply
of component shown by auxiliary
code.

Check harness for communica-
tion system of component shown by
auxiliary code.

If error occurs again, replace
component shown by auxiliary
code.
*2: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
*3: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
*4: It may be stored when the engine key is turned again 1 min. after engine start.
*5: It may be stored when the engine key is turned again after engine start. DI±814
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)

EJECT Error 45 62
(CD player)Magazine cannot be ejected.
Scratched/
Reversed Disc 46 62
(CD player)Scratches or dirt is found on CD sur-
face or CD is set upside down.Replace radio receiver assembly.
Inspect CD.
Physical address: 178 Navigation ECU
Gyro Error Error in gyro sensor is detected.
(Abnormal value in voltage output
from sensor is detected for more
than specified time.)
Check the Gyro voltage in the
diagnosis system mode. 10 58
(Navigation ECU)
Map Disc Error Data cannot be read for a specified
time due to scratches or dirt on disc
surface or insertion of music CD.
Inspect disc and replace if neces-
sary. (Visually check disc surface
and wipe it with soft cloth.) 42 58
(Navigation ECU)
Vehicle speed
sensor Signal
ErrorInput error of vehicle speed sensor
signal is detected. (When no vehicle
speed sensor signal has been input
for a specified time.)
Check the vehicle speed signal in
the diagnosis system mode.

Inspect wire harness for vehicle
speed signal.

If wire harness is normal, replace
navigation ECU. 43 58
(Navigation ECU)
Player Error Malfunction of player continues for a
specified length of time.
Check if disc can be inserted/tak-
en out or not. If not , replace naviga-
tion ECU.

When the same code is detected
in recheck after deleting the DTC
memory. 44 58
(Navigation ECU)
GPS Receiver
ErrorOperation error of GPS receiver is
detected.
At an outdoor site with a clear
view, operate to display the GPS in-
formation screen of the diagnosis
system. If GPS time stamp is not
properly displayed after 15 min. or
more, replace navigation ECU. 11 58
(GPS receiver)
GPS Antenna
ErrorOperation condition of GPS anten-
na cable is detected. (Open circuit,
connection failure of connectors,
etc.)
Check if the GPS antenna is cor-
rectly connected or positioned or
not. After replacing the antenna, if
the error remains, replace the navi-
gation ECU. 40 58
(GPS receiver)
Power Supply
Error of GPS
AntennaAbnormal voltage of GPS antenna
cable or short circuit is detected.
Inspect GPS antenna and replace
if necessary. (When no continuity is
identified between connector's core
and sealed part, GPS antenna is
normal.)

If GPS antenna is normal, replace
navigation ECU. 41 58
(GPS receiver)
Player Temp.
Too HighReadout cannot be done because
temperature around player's pickup
(reading part) is too high.With IG switch OFF, leave vehicle in
cool shaded place for a while and
recheck. After deleting the DTC
memory, If same code detected, re-
place navigation ECU. 45 58
(Navigation ECU)
*2: Even if no failure is detected, it may be stored depending on the battery condition or voltage for starting an engine.
*3: It is stored when 180 sec. has passed after the power supply connector is pulled out after engine start.
*4: It may be stored when the engine key is turned again 1 min. after engine start.
*5: It may be stored when the engine key is turned again after engine start.
*6: When 210 sec. has passed after pulling out the power supply connector of the master component with the ignition
switch in ACC or ON, this code is stored.
± DIAGNOSTICSNAVIGATION SYSTEM
DI±817
2001 PRIUS (RM778U)

I04108
Q07191
D09785
SLS+
STPACC IGA
E B
P1
P
P2
SLS±KLS+
HT±56
± HYBRID TRANSAXLESHIFT LOCK SYSTEM
2001 PRIUS (RM778U)
4. INSPECT KEY INTERLOCK SOLENOID
(a) Disconnect the solenoid connector.
(b) Using an ohmmeter, measure the resistance between ter-
minals 3 and 4.
Standard resistance: 12.5 ± 16.5 W
If the resistance value is not as specified, replace the solenoid.
(c) Apply battery positive voltage between the terminals 3
and 4. Check that an operation sound can be heard from
the solenoid.
If the solenoid does not operate, replace the solenoid.
5. INSPECT SHIFT LOCK CONTROL SWITCH
Check that there is continuity between terminals.
Shift positionTester connectionStandard
P positionA, 5 ± B, 2 (E ± P1)Continuity
P position
(Pull the shift lever toward
you)A, 5 ± B, 2 (E ± P1)
A, 5 ± B, 6 (E ± P2)Continuity
R, N, D, 2, L positionA, 5 ± B, 6 (E ± P2)Continuity
If continuity is not identified, replace the switch.

Disarmed state
Perform any of the following and the system will go no to ºArming preparationº:

With all the doors, engine hood and luggage compartment door closed, lock all doors with the key.

With all the doors, engine hood and luggage compartment door closed, lock all doors with the
wireless remote.

With all the doors, engine hood and luggage compartment door closed, open and close any of doors,
engine hood or luggage compartment door, then close and lock all doors, engine hood and luggage
compartment door.
Arming preparation
Perform the following and the system will
go on to ºArmed stateº:

Let 30 seconds elapse with all the doors,
engine hood and luggage compartment door
closed and locked.
Perform any of the following and the system
will return to ºDisarmed stateº:

Open any of the doors, engine hood or luggage
compartment door.

Unlock any of the doors.

Put the key in the ignition.

Reconnect the battery.
Armed state
Perform any of the following and the system
will return to ºDisarmed stateº:

Unlock any of the doors or open the luggage
compartment door with the wireless remote.

Unlock the doors with the wireless remote.

Put the key in the ignition and turn it to ON.
Perform any of the following and the system
will go on to ºAlarm soundingº:

Open any of the doors.

Unlock any of the doors in any way other than
with a key or the wireless remote.

Open the luggage compartment door in any way
other than with a key.

Open the engine hood.

Reconnect the battery.

When input from optional glass break sensor is
detected (Dealer option)(Key not inserted in ignition.)
Alarm sounding
The vehicle's horn and security horn will sound,
and the hazard, interior, tail and head lights flash
for 60 seconds.
After the alarm has ended, the system will
return to ºArmed stateº. Perform any of the following and the system
will return to ºDisarmed stateº:

Unlock any of the doors or open the luggage
compartment door with the wireless remote.

Unlock the doors with the wireless remote.

Put the key in the ignition and turn it to ON.
BE±68
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2001 PRIUS (RM778U)
2. ACTIVE ARMING MODE

Perform any of the following and the system will go to Disarmed state (B):

Remove the key from the ignition, close the driver's door, then the ignition OFF.
Disarmed state (A)
Perform any of the following and the system
will return to Disarmed state (A):

Push the unlock switch on the wireless
remote.

Put the key in the lock on the driver's or the
passenger door and turn it towards unlock.

Put the key in the ignition.

Reconnect the battery.

Turn the ignition from OFF to ON.Disarmed state (B)Perform any of the following and the system
will go to Arming preparation:

Close all the doors, hood and
luggage compartment door.
Perform any of the following
and the system
will return to Disarmed state
(B):

Open any of the doors, the
hood or the
luggage compartment door.
Arming preparation
Perform any of the following
and the system
will go to Armed state:

Allow 30 seconds to elapse
with all the doors,
hood and luggage compart-
ment door closed.
Perform any of the following and
the system
will return to Disarmed state (A):

Push the unlock switch on the
wireless
remote.

Put the key in the lock on the
driver's or the
passenger door and turn it to-
wards unlock.

Put the key in the ignition.

Reconnect the battery.

Turn the ignition from OFF to
ON.
BE±70
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2001 PRIUS (RM778U)
3. PASSIVE ARMING MODE
This mode can be switched according to the specified op-
eration.
All initially set modes (when shipped from factory) are ac-
tive mode. (No passive mode)