O2 sensor TOYOTA PRIUS 2001 Service Repair Manual

H01583
Outer
Outer
RS±8
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2001 PRIUS (RM778U)
12. CONNECTION OF CONNECTORS FOR FRONT AIR-
BAG SENSOR AND SIDE AIRBAG SENSOR
(a) Align the male connector (of the side of sensor) and fe-
male connector in the same direction as shown in the il-
lustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it un-
til the outer returns to its original position again.
If fitting stops half way, connectors will separate.
(c) Be sure to insert until they are locked. After fitting in, pull
them slightly to check that they are locked. (When locked,
make sure that the outer returns to its original position and
sound at the time of fitting in can be heard.)
HINT:
Do not fit in while holding the outer.
When fitting in, the outer slides. Do not touch it.

BE±6
± BODY ELECTRICALTROUBLESHOOTING
1673 Author: Date:
2001 PRIUS (RM778U)
WIPER AND WASHER SYSTEM
SymptomSuspect AreaSee page
Wipers and washer do not operate.
1. WIPER Fuse
2. Wiper Switch
3. Wiper Motor
4. Wire HarnessBE±12
BE±34
BE±34
±
Wipers do not operate in LO, HI or MIST.
1. Wiper Switch
2. Wiper Motor
3. Wire HarnessBE±34
BE±34
±
Wipers do not operate in INT.
1. Wiper Switch
2. Wiper Motor
3. Wire HarnessBE±34
BE±34
±
Washer motor does not operate.
1. WASHER Fuse
2. Washer Switch
3. Washer Motor
4. Wire HarnessBE±12
BE±34
BE±34
±
Wipers do not operate when washer switch ON.
1. WASHER Fuse
2. Washer Switch
3. Wiper Motor
4. Wire HarnessBE±12
BE±34
BE±34
±
Washer fluid does not operate.Washer Hose and Nozzle±

When wiper switch is in HI position, the wiper blade is in contact
with the body.

When the wiper switch is OFF, the wiper blade does not retract
or the retract position is wrong.
1. Wiper Motor *1
2. Wire harness *1BE±34
±
*1: Inspect wiper arm and blade set positions.
Meter Gauges and Illumination:
COMBINATION METER
SymptomSuspect AreaSee page
Fuel Gauge and Water Temperature Gauge does not operate.
1. GAUGE Fuse
2. Meter Circuit Plate
3. Wire Harness±
BE±39
±
Speedometer does not operate.
1. Vehicle Speed Sensor
2. Meter Circuit Plate
3. Wire HarnessBE±42
BE±39
±
Tachometer does not operate.
1. Igniter
2. Engine and ECT ECU
3. Meter Circuit Plate
4. Wire Harness±
±
BE±39
±
Fuel Gauge does not operate or abnormal operation.1. Fuel Tank Assembly
2. Wire Harness±
±
All illumination lights do not light up.
1. TAIL Fuse
2. Meter Circuit Plate
3. Wire Harness±
BE±42
±
Only one illumination light does not light up.1. Bulb
2. Wire Harness±
±

± BODY ELECTRICALTROUBLESHOOTING
BE±7
1674 Author: Date:
2001 PRIUS (RM778U)
Warning Lights:
COMBINATION METER
SymptomSuspect AreaSee page
Warning light do not light up. (Except Discharge, Open Door and
SRS)
1. GAUGE Fuse
2. Meter Circuit Plate
3. DC/DC converter
4. Wire Harness±
BE±39
±
±
Fuel Level warning light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Fuel Tank Assembly
4. Wire Harness±
BE±39
±
±
Low Oil Pressure warning light does not light up.
1. Bulb
2. Low Oil Pressure Warning Switch
3. Meter Circuit Plate
4. Wire Harness±
BE±42
BE±39
±
ABS warning light does not light up.
1. Bulb
2. ABS ECU
3. Wire Harness±
DI±351
±
Seat Belt warning light does not light up.
1. Bulb
2. Buckle Switch
3. Meter Circuit
4. Wire Harness±
BE±42
BE±42
±
Brake warning light does not light up.
1. Bulb
2. Parking Brake Switch
3. Brake Fluid Level Warning Switch
4. Meter Circuit Plate
5. Wire Harness±
BE±42
BE±42
BE±39
±
SRS Warning light does not light up.
1. Bulb
2. Airbag Sensor Assembly
3. Meter Circuit Plate
4. Wire Harness±
DI±495
BE±39
±
Open Door warning light does not light up.
1. DOME Fuse
2. Bulb
3. Door Courtesy Switch
4. Meter Circuit Plate
5. Wire Harness±
±
BE±27
BE±39
±
Indicator Lights:
COMBINATION METER
SymptomSuspect AreaSee page
High beam indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Headlight System±
BE±39
±
BE±20
Turn indicator light does not light up.
1. Bulb
2. Meter Circuit Plate
3. Wire Harness
4. Turn Signal and Hazard Warning System±
BE±39
±
BE±25
Malfunction indicator light does not light up.
1. Bulb
2. ECM
3. Meter Circuit Plate
4. Wire Harness±
±
BE±39
±
Indicator lights do not light up. (Except Turn, Hi±beam and
security)1. GAUGE Fuse
2. Wire Harness±
±

BE±8
± BODY ELECTRICALTROUBLESHOOTING
1675 Author: Date:
2001 PRIUS (RM778U) Shift position indicator light does not light up.
1. ECM
2. Shift Position Sensor
3. HV ECU
4. Meter Circuit Plate
5. Wire Harness±
HT±54
±
BE±39
±
CRUISE indicator light does not light up.
1. Bulb
2. HV ECU
3. Meter Circuit Plate
4. Wire Harness±
±
BE±39
±
DEFOGGER SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Rear window defogger does not operate.
1. DEF M±Fuse
2. Defogger Relay
3. Defogger Switch (in A/C Amplifier)
4. Defogger Wire
5. Wire Harness
6. Body ECU
7. Noise Filter
8. A/C ECUBE±12
BE±49
DI±864
BE±49
±
DI±678
±
DI±864
Mirror heater does not operate.
1. M±HTR Fuse (Passenger SIde J/B)
2. Mirror Heater Relay
3. Mirror Heater
4. Wire HarnessBE±12
BE±49
BE±49
±
POWER WINDOW CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Power window dose not operate.
1. ECU B Fuse
2. GAUGE Fuse
3. Power Main Relay
4. Ignition Switch
5. Power Window Master Switch
6. Body ECU
7. Wire HarnessBE±12
BE±12
BE±56
BE±17
BE±56
DI±678
±
Only the driver's window does not operate.
1. Power Window Master Switch
2. Power Window Switch
3. Power Window Motor
4. Wire HarnessBE±56
BE±56
BE±56
±
ºWindow lock functionº does not operate.Power Window Master SwitchBE±56
Illumination does not light up.Power Window Master SwitchBE±56

BE1VS±02
I18849
Brake Master Cylinder

Brake Fluid Level Warning Switch
Combination Meter Assembly

Meter Circuit
Multi Display
Ignition Switch
Instrument Panel J/B

Body ECU

GAUGE Fuse
Stop Light Switch
Engine Room J/B

DOME Fuse
Seat Belt Buckle Switch
Occupant Detection
Sensor
± BODY ELECTRICALCOMBINATION METER
BE±37
1704 Author: Date:
2001 PRIUS (RM778U)
COMBINATION METER
LOCATION

No. Wiring connector side
1
2
3
10
11
12
13
14
15
16
17
18
19
20
21
22EMPS ECU
Fuel tank temperature (+)
Hybrid vehicle control ECU (4P)
Ground
Ground
Center airbag sensor assembly
Headlight dimmer switch
Turn signal switch (Right)
Turn signal switch (Left)
Fuel tank temperature (±)
DOME Fuse
GAUGE FuseODO/TRIP switch (TC)
ODO/TRIP switch (E)
ODO/TRIP switch (ODO)
9 ABS ECU (SI)
ABS ECU (ABS)
2
3
4
5
6
7 1 Back±up light relay
Body ECU
Engine ECM
ACC Fuse
Light control rheostat (TC)
Light control rheostat (TR) A
BBody ECU
± BODY ELECTRICALCOMBINATION METER
BE±41
2001 PRIUS (RM778U)

BE1V2±01
I17845
Power WIndow Master Switch
1 One touch power window does not move up and down.
After turning the ignition switch ON and power window master switch UP or DOWN on the drivers side, check
that the master switch AUTO light blinks.

Error is classified into the following 3 types according to the way of blinking.
UP or DOWNON
OFF
1 Limit switch error 3 Limit switch/Pulse sensor
synchronize error
1.5 secs.
2 secs.Repeat
1.5 secs.0.5 sec.
No Repeat 2 Pulse sensor error
Repeat
< Reference >
When the ignition switch is turned OFF after the AUTO light starts
blinking, the blinking will stop 43 sec. later.

When the ignition switch is turned ON after that, the AUTO light will
start blinking again.
0.5 secs.
Blinks in the 1 way
Remove the master switch.
(Connector connection condition)Master switch defective
Blinks in the 2 or 3 way
1 sec.
CONTINUED ON NEXT PAGECONTINUED ON NEXT PAGE
0.5 sec.0.5 sec. 0.5 sec.
2.5 secs. 4 secs. 4 secs.3.5secs.
± BODY ELECTRICALPOWER WINDOW CONTROL SYSTEM
BE±51
1718 Author: Date:
2001 PRIUS (RM778U)
POWER WINDOW CONTROL SYSTEM
TROUBLESHOOTING

DI7T9±01
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±67
2001 PRIUS (RM778U)
PRE±CHECK
1. OUT LINE OF THEFT DETERRENT SYSTEM
When the theft deterrent system detects any theft, it informs
people around with flashing lights and sound.
This system is designed to be upgraded by featuring an option-
al glass break sensor.
All initial setting are performed in active mode. It can be
switched to passive mode by specified operation. (See step 3.
CHANGING METHOD OF PASSIVE MODE)
HINT:
There are 4 conditions in this system which are disarmed state,
arming preparation, armed state and alarm sounding.
(1) Disarmed state
When the alarming function does not oper-
ate.
When theft deterrent function is not per-
formed.
(2) Arming preparation
Time until transferring to armed state.
Theft deterrent function is not performed.
(3) Armed state
When theft deterrent function is possible.
(4) Alarm sounding:
In this condition, once theft is detected, it is in-
formed using light and sound to people around the
vehicle.
Refer to the table for alarming method or time.
Horn
Security horn
Al i th dHeadlightAlarming methodTaillight
Hazard
Interior light
Alarming time60 seconds
Alarming outputContinuous 0.4 secs. (ON)
0.4 secs. (OFF)
HINT:
Alarming output for hazard is same as the one for the hazard
on the vehicle.
In the arming condition when either of doors is unlocked with
key not in the key cylinder, force lock signal is output.

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

N14519
Drain Hose
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±9
2001 PRIUS (RM778U)
3. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Perform in these conditions:
Stop engine.
Secure good ventilation (If the gas leak detector
may not react to volatile gases which are not refrig-
erant, such as evaporated gasoline and exhaust
gas.)
Repeat the test 2 or 3 times.
Make sure that there is some refrigerant remaining
in the refrigeration system.
When compressor is OFF: approx. 392 ± 588 kPa
(4 ± 6 kgf/ cm
2, 57 ± 85 psi)
(b) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:
After the blower motor has stopped, leave the cooling unit
for more than 15 minutes.
Expose the gas leak detector sensor under the drain
hose.
When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c) If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(d) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e) Bring the gas leak detector close to the refrigerant lines
and perform the test.