Page 165 of 1943

2001 PRIUS (EWD414U)
SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the applicable model year.
Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.
Work must be started after 90 seconds from when the ignition switch is turned to the ºLOCKº position and the
negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds from
disconnecting the negative (±) terminal cable of the battery, the SRS may be deployed.)
When the negative (±) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is
finished, reset the audio systems as they were before and adjust the clock. To avoid erasing the memory in each
memory system, never use a back±up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt pretensioner,
airbag sensor assembly or side airbag sensor directly to hot air or flames.
Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbag
assembly, side airbag assembly, seat belt pretensioner, airbag sensor assembly and side airbag sensor assembly
should be inspected.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt
pretensioner, airbag sensor assembly or side airbag sensor assembly in order to reuse it.
If the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt pretensioner, airbag sensor
assembly or side airbag sensor assembly has been dropped, or if there are cracks, dents or other defects in the case,
bracket or connector, replace them with new ones.
Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
After work on the SRS is completed, perform the SRS warning light check.
If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.
Page 167 of 1943

2001 PRIUS (EWD414U)
B 20 B 9 B 26 B 1510A
ACC FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2D 2
2A 9 2B 4
2E 1
B 3
21216 13 7
FRONT AIRBAG SENSOR
RH F 2
FRONT AIRBAG SENSOR
LH F 1DATA LINK
CONNECTOR 3 D 2
AIRBAG SENSOR ASSEMBLYB A17 , A18AC, A19 AB TC SIL
W±R
BR
B±W
BR±W W±R
BR
B±Y L
GR±R
LA
+SL ±SL +SR ±SRB 12
SIL E E
B 19
JUNCTION
CONNECTOR J26 P±B
WP±B
W
B±Y
TC
IL1 3IL14
B±W
BR±W
B D
A EA 11
2K 8
ID A
BUCKLE SW
LH B20G±O W± B
W±B
LBE+
A A
JUNCTION
CONNECTOR J29
JUNCTION CONNECTORB J22 A , J23
JUNCTION
CONNE CTOR J11
G±O
IJ1 11
W±B
IL1 2 IL1 1A C
B C
GR± R
B A 14 A 16
B5
B
GR± R L
JUNCTION
CONNECTORB J27 A , J28
SRS WARNING LIGHT
[COMB. METER]B C10 , C11A
JUNCTION
CONNECTOR J26
2D 8
L
A A
B C
JUNCTION
CONNECTORB J22 A , J23
1 2
2E 3B 28
W±B
E2
C 8RBE+
G±O
* 1 : W/ SIDE AIRBAGS
IJ1 9
B AA AAA
IJ1 10B 27E1
W±B
IH
W± B
2A 7
2B 6
1 3
3 2
BRP±L P±L W± B W±B
W± B W±B
W±B
W± B
JUNCTION
CONNECTORB J24 A , J25
BUCKLE SW RH AND
SEAT BELT WARNING
OCCUPANT DETECTION SENSOR B21
BODY ECU B 9
Page 180 of 1943
2001 PRIUS (EWD414U)
COMBINATION METER
VFD
A 22 A21 A20 A12 B2
A 14 A2A3A1B7B6B1A9A11 10A
GAUGE FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2A 515A
DOME
1J 7
2A 42G 2
IP1 4IP15 2J 62J82J9 7. 5A
ECU±B
2C 5B 9A 15 B 16
2B 62A 7
IH14
4 8
351516
13
GR±L
L L W±G LG±RW±LL L L L BR
GR GR±L
GR± BBR±RY±BY
L±WL±Y
L LR±G L±Y LLR±G R±G
MPX+ MPX± FU± FU+
MPX1 MPX2 BFUA
COMBINATION METERB C10 , C11A BODY ECUB B 8 , B 9A
FUEL SENDER F16
ENGINE CONTROL
MODULE E10
ODO/TRIP SW
[HAZARD WARNING SW] H 8FROM BACK±UP
LIGHT RELAY
FROM BRAKE ECU TO L IGHT
CONTROL RHEOSTAT
FROM EMPS ECUY
Y±B
BR±R L±Y
L±R
FUEL
SENDER
SENSOR 20 11 19
A F
A FJUNCTION
CONNECTORJ27 A
EODOTC
Page 194 of 1943

2001 PRIUS (EWD414U)
I GROUND POINT
IGCT RELAY
A/C TRIPLE
PRESSURE SW
HYDRAULIC BOOSTER
WATER PUMP MOTOR
(
A/C)
FRONT PARKING
LIGHT LH
FRONT PARKING
LIGHT RHIG2 RELAY
ENGINE HOOD
COURTESY SW
FRONT WI PER MOTOR
FRONT TURN
SIGNAL LIGHT LH
RADIATOR FAN MOTOR
ABS SOL
RELAY
INVERTER
(
GND1)
(
GND2)
PTC HEATER
BLOWER MOTOR
LINEAR CONTROLLER
(
E1)
(
SG)
(
E01)
(
E02) FRONT SIDE MARKER
LIGHT LH
FRONT SIDE MARKER
LIGHT RH
FRONT TURN
SIGNAL LIGHT RH
BRAKE FLUID LEVEL
WARNING SW
WATER TEMP. SW
DRL RELAY
IGNITION COIL AND
IGNITER NO. 1
IGNITION COIL AND
IGNITER NO. 2
IGNITION COIL AND
IGNITER NO. 3
IGNITION COIL AND
IGNITER NO. 4
ENGINE CONTROL
MODULE1K3
E 5
E 5
E 5
E 5 E 5
E 5
E 5
E 5 (
±S)
E 5
E 5
3HYDRAULIC BOOSTER E 5 E 5 (
CUT±)
E 1
E 1
E 1
E 1
E 1
E 1
3W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W±B
W± BW±B
W±B W±B W±B
W±B
W±B
W±B
W±B
W±B
W±B W±B W±B W± B W±B W± B W±B W±B W±B W±B
W±B W±B W±B W±B W±B
A
AA
(
*1)IE ECW± B
W± B
W± B
W± B
W± B
W± B W±BA
AA
A
AJUNCTION
CONNECTOR J 7
J 1
JUNCTION
CONNECTOR
W±B
A
BRAKE ECU
EAE 3 E 3 E 3
EBID214
IO114 A A
B A JUNCTION
CONNECTORB J 8 , J 9A W±B
W±B
W±B
W±B
W±B
W±BBR
BR
W±B
W±BBR BR
W±B W±B W±B
BR
ENGINE CONTROL
MODULE
ENGINE CONTROL
MODULE
(
ME01)
(
E03)DATA LINK
CONNECTOR 3 HTR RELAY
NAVIGATION ECU
RADIO AND PLAYER
IFIJ121
BR
BR
BR BR
MULTI DISPLAY (
*2)(
*2)
AIRBAG SENSOR
ASSEMBLY
COMBINATION
METER(
E1)
(
ES)
IH W±B
2B6 7
LBR
2A WATER PUMP
MOTOR (
INVERTER)
2W±B
FAN NO. 2
RELAY
AEFI RELAY
Page 195 of 1943

2001 PRIUS (EWD414U)
HYBRID VEHICLE
CONTROL ECU
KEY INTERLOCK
SOLENOID
HAZARD WARNING
SW
BUCKLE SW AND
TENSION REDUCER LHPARK/NEUTRAL
POSITION SW
WIRELESS DOOR
CONTROL RECEIVER
(
GND)
(
CG)
CIGARETTE LIGHTER
DOOR LOCK MOTOR,
DOOR KEY LOCK AND
UNLOCK SW AND DOOR
UNLOCK DETECTION
SW FRONT LH
(
E)
IG1 RELAY
FUEL PUMP AND
FUEL SENDER
EMPS ECU
POWER WINDOW
CONTROL SW REAR RH
DOOR LOCK MOTOR AND
DOOR UNLOCK
DETECTION SW
REAR RH
POWER WINDOW
CONTROL SW FRONT RH
(
EL) A/C AMPLIFIER
UNLOCK
WARNING SW
REMOTE CONTROL SW
SHIFT LOCK ECU
BUCKLE SW RH AND
SEAT BELT WARNING
OCCUPANT DETECTION
SENSOR
AIRBAG SENSOR
ASSEMBLY
TRANSPONDER
KEY COMPUTER
POWER WINDOW
MASTER SW
PTC HEATER
DAYTIME RUNNING
LIGHT RELAY
BRAKE ECU* 1 : W/ DAYTIME RUNNING LIGHT
* 2 : W/ NAVIGATION SYSTEM
BB11
IQ11
IG ID B D
A E
E
A D
BE
A D
B
IJ111
B A
A A
B A
A A A
A A
B B A
A A
A
A A
B
A AIG12
IJ110
IC11
IA15
IA11 AA
A
A
A
AA
A AAA A A E
EW±B
W±B W± B
W± B
W± B
W±B W±B
W± B
W± B
W± B
W± BW± B
W±B W±BW±B
W±B
W±B
W±B
W±B
W±B W±B
W±B W± B
JUNCTION CONNECTORB J22 , J23A
JUNCTION
CONNECTORB J24 , J25A
2D8
2E3
2K8
A JUNCTION CONNECTOR J10
(
E)
(
E)W±B W±B
W±B
W±B
W±B W±B
W±B
W± B
W± B
W± B W± BW± B
W± B
W± B W±B
W±B J11
JUNCTION
CONNECTOR
J17
JUNCTION
CONNECTOR W±B
(
*1)
(
GND4) (
GND3)W± B
W± B
W± B
COMBINATION SW B 3W± B
W± B W±B
W±B
W±B
(
E)
(
CG) (
EOM)
(
KLS±)
GATEWAY ECU
DATA LINK
CONNECTOR 3
W±B
BODY ECU
(
E2) (
UN±) (
TL)LIGHT CONTROL
RHEOSTAT
GATEWAY ECU E
E
W± B E
JUNCTION
CONNECTOR J21
W±B
Page 202 of 1943

2001 PRIUS (EWD414U)
J POWER SOURCE (Current Flow Chart)
Fusible Link Block No.1 (See Page 22)
FuseSystemPage
100ADC/DC
Illumination
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off
Taillight
TOYOTA Hybrid System92
11 4
104
88
54
Fusible Link Block No.2 (See Page 23)
FuseSystemPage
5ADC/DC±STOYOTA Hybrid System54
120AMAIN
ABS
Engine Control
Headlight (w/o Daytime Running Light)
Hybrid Vehicle Immobiliser System
Illumination
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off
SRS
Taillight
TOYOTA Hybrid System172
68
84
78
92
11 4
104
167
88
54
Engine Room R/B No.3 (See Page 24)
FuseSystemPage
7.5ADRLHeadlight (w/ Daytime Running Light)80
10AABS NO.4ABS172
30AHTR1Air Conditioning188
30AHTR2Air Conditioning188
40AABS NO.1ABS172
50AEMPSEMPS164
50AHTR3Air Conditioning188
Engine Room J/B (See Page 26)
FuseSystemPage
10ABATT FANTOYOTA Hybrid System54
10AHEAD (LH)Headlight (w/o Daytime Running Light)84
10AHEAD (RH)Headlight (w/o Daytime Running Light)84
10AHEAD HI (LH)Headlight (w/ Daytime Running Light)80
10AHEAD HI (RH)Headlight (w/ Daytime Running Light)80
10AHEAD LO (LH)Headlight (w/ Daytime Running Light)80
10AHEAD LO (RH)Headlight (w/ Daytime Running Light)80
10AHORNHorn
Theft Deterrent124
146
10ATURN±HAZTurn Signal and Hazard Warning Light96
*These are the page numbers of the first page on which the related system is shown.
Page 203 of 1943

2001 PRIUS (EWD414U)
J
FuseSystemPage
15AAM2
ABS
Engine Control
Hybrid Vehicle Immobiliser System
SRS
TOYOTA Hybrid System172
68
78
167
54
15ADOME
Combination Meter
Door Lock Control
Headlight (w/ Daytime Running Light)
Headlight (w//o Daytime Running Light)
Illumination
Interior Light
Key Reminder and Light Reminder Buzzer
Navigation System
Power Window
Radio and Player
Seat Belt Warning
Theft Deterrent
TOYOTA Hybrid System
Wireless Door Lock Control182
134
80
84
92
108
11 4
156
126
152
11 8
146
54
140
15AEFIEngine Control68
15ATHROEngine Control68
20AABS NO.3ABS172
20AHVTOYOTA Hybrid System54
30AABS NO.2ABS172
30ACDS FANRadiator Fan and Condenser Fan186
30AHEAD
Headlight (w/ Daytime Running Light)
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off80
11 4
104
30ARDIRadiator Fan and Condenser Fan186
50AHTRAir Conditioning188
Instrument Panel J/B (See Page 30)
FuseSystemPage
5AECU±IG
ABS
Electric Tension Reducer
EMPS
Gateway System
Navigation System
Radiator Fan and Condenser Fan
Shift Lock172
162
164
160
156
186
132
5APANELIllumination92
7.5AECU±BAir Conditioning
Combination Meter188
182
*These are the page numbers of the first page on which the related system is shown.
Page 204 of 1943

2001 PRIUS (EWD414U)
J POWER SOURCE (Current Flow Chart)
FuseSystemPage
7.5AECU±B
Door Lock Control
EMPS
Gateway System
Headlight (w/ Daytime Running Light)
Hybrid Vehicle Immobiliser System
Interior Light
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off
Power Window
Theft Deterrent
Wireless Door Lock Control134
164
160
80
78
108
11 4
104
126
146
140
7.5AOBDIIEngine Control
Theft Deterrent68
146
7.5ATAIL
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off
Taillight11 4
104
88
10AACC
Combination Meter
Gateway System
Navigation System
Radio and Player
Remote Control Mirror
Shift Lock
SRS182
160
156
152
130
132
167
10AGAUGE
ABS
Air Conditioning
Back±Up Light
Combination Meter
Door Lock Control
EMPS
Engine Control
Headlight (w/ Daytime Running Light)
Key Reminder and Light Reminder Buzzer
Light Auto Turn Off
Navigation System
Power Window
Rear Window Defogger
Seat Belt Warning
Theft Deterrent
TOYOTA Hybrid System
Turn Signal and Hazard Warning Light
Wireless Door Lock Control172
188
102
182
134
164
68
80
11 4
104
156
126
180
11 8
146
54
96
140
10AHTRAir Conditioning188
10ASRS ACCSRS167
*These are the page numbers of the first page on which the related system is shown.