2001 TOYOTA PRIUS relay

2001 PRIUS (EWD414U)
ABS
C 1
D 11B 215A
AM2 1J 92C 2
2G 176AM2 IG2
ST220A
ABS NO. 3
1K30A
ABS NO. 2
1K40A
ABS NO. 1 FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
3
22 22
24 13
24 13
22 2236 21433
33 3 IA214
B±G B W±R W±R
B±W
W±L
B
W±R R W±B LG±RG Y±G G± W
B±W
R
L±O
Y±B
B±L
LG±R
Y±G
G
G±W
W±B
HYDRO MTR
NO. 1 RELAY
HYDRO MTR
NO. 2 RELAY
ABS SOL RELAY
BATTERYFUSIBLE LINK
BLOCK NO. 2F18 FUSIBLE LINK
BLOCK NO. 1D F12 , F13C
1
120A
MAINIGNITION SW I15
Y±B L±OY±B 6411
22

2001 PRIUS (EWD414U)
1. INPUT SIGNALS
(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the brake ECU.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the brake ECU when the brake pedal is depressed.
2. ABS SYSTEM OPERATION
During sudden braking the brake ECU has signals input from each sensor, which controls the current to the solenoid inside
the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The pump inside the
actuator is also operating at this time and it returns the brake fluid from the reservoir to the master cylinder, thus preventing
locking of the vehicle wheels.
If the brake ECU judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current on the solenoid is
controlled and the hydraulic pressure is increased. Holding of the hydraulic pressure is also controlled by the brake ECU, by
the same method as above. Pressure reduction, holding and increase are repeated to maintain vehicle stability and to
improve steerability during sudden braking.
A4, A5 ABS SPEED SENSOR FRONT LH, RH
2±1 :1.4±1.8 kW (20°C, 68°F)
A23, A24 ABS SPEED SENSOR REAR LH, RH
2±1 :1.04±1.3 kW (20°C, 68°F)
B10 (A), B11 (B), B12 (C), B13 (D) BRAKE ECU
(B) 6, (C) 1±GROUND : Approx. 12 volts with the ignition SW at ON position
(D) 22±GROUND : Always approx. 12 volts
(A) 6, (A)31±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A434C10A36J1037
A534C11B36J1137
A736D236J1237
A2338E636J14A37
A2438E1036J15B37
B1A34F12C34J1637
B2B34F13D34J1737
B3C34F1838J18A37
B434G137J19B37
B8A36H5A34J2237
B10A36H6B34J2637
B11B36H1538P237
B12C36I1537S337
B13D36J137
B1436J737
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
223Engine Room R/B No.2 (Right Side of Reserve Tank)
324Engine Room R/B No.3 (Engine Compartment Right)
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
REAR WINDOW DEFOGGER
40A
DEF FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
10A
GAUGE
32 51
2M 4
A 15
3 2
11
REAR WINDOW
DEFOGGER
NOISE FILTER
(
REAR WINDOW DEFOGGER) N 41
B
GR GR±B
MPX+
MPX±
MPXCOMBINATION
METER C11 MPX+BODY
ECUB 8 A DEF
RELAY
13
PSG
SW
RDEFREAR WINDOW
DEFOGGER SW
A/C AMPLIFIER A 7 DFG 2 1

2001 PRIUS (EWD414U)
DEF RELAY
5±3 : Closed with the ignition SW on and the rear window defogger SW on
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A736C1136
B8A36N439
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
2M31Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)
SERVICE HINTS

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

2001 PRIUS (EWD414U)
COMBINATION METER
MALFUNCTION
INDICATOR LAMP
ABS
SRS
TURN L
TURN R
HIGH BEAM OUTPUT CONTROLWAT ER TEMP.
(
HIGH) WAT ER TEMP.
(
LOW) CRUISE
A 17 A 18 A 19 B 5
A 16 A 10 B 4
L L L GR± R B±YL G±R
COMBINATION METERB C10 , C11A
FROM HEADLIGHTS (
*1)
FROM DAYTIME RUNNING
LIGHT RELAY (
*2) FROM TURN SI GNAL
FLASHER RELAY TO ENGINE
CONTROL MODULE
TO BRAKE ECU
TO AIRBAG SENSOR
ASSEMBLY
10A
ACC FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2D 2
GR± R
A B
B C
B B
JUNCTION
CONNECTOR J26
JUNCTION
CONNECTORB J27 , J28AGR ±R
GR± R* 1 : W/O DAYTIME RUNNING LIGHT
* 2 : W/ DAYTIME RUNNING LIGHT

2001 PRIUS (EWD414U)
RADIATOR FAN AND CONDENSER FAN
30A
RDI30A
CDS FAN FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
32 51
32 51
1K 752 431
1J 51K51J12 1K 2 1K 3
IE E 5 M
1 2
M
2 1
IE1 7
A E
B A
1 2IE1 111J 45A
ECU±IG
2G 7
FAN NO. 1
RELAYFAN NO. 2
RELAYFAN NO. 3
RELAY
L±W
W±B
L±W
W±G
G±W
V±Y
B±Y
B±Y W± B
V±Y
RADIATOR FAN
MOTOR R 1
A/C CONDENSER FAN
MOTOR A 1
W± B
W±B
V±Y V±Y W±B
W± BA
A
A AA/C SINGLE
PRESSURE SW A 3
JUNCTION
CONNECTOR J 7WATER TEMP. SW W 4
JUNCTION
CONNECTOR J 1JUNCTION
CONNECTORB J27 , J28
A 1A 11
ENGINE CONTROL
MODULE E 7
4
LG
W± B A1J 10
IE1 6
R±W R±W
1
A/C
AMPLIFIER A 8 2 1
RF FAN
3 2

2001 PRIUS (EWD414U)
The radiator fan motor and A/C condenser fan motor operates according to the water temp. SW (Inverter), A/C single
pressure SW, and the A/C system condition. The FAN NO.1 relay, FAN NO.2 relay, FAN NO.3 relay are turned on/off, to
operate the fan motors at low speed (In series), or high speed (In parallel).
1. LOW SPEED OPERATION
When the water temp. SW (Inverter) is on, the radiator fan motor and A/C condenser fan motor operates at low speed.
2. HIGH SPEED OPERATION
When the water temp. SW (Inverter) is on, if the A/C system is operating A/C single pressure SW is on, the radiator fan motor
and A/C condenser fan motor operates at high speed.
A3 A/C SINGLE PRESSURE SW
3±2 : Close above approx. 15.2 kgf/cm2 (220 psi, 1520 kpa)
Open below approx. 12.3 kgf/cm2 (178 psi, 1230 kpa)
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A134J137R135
A334J737W435
A836J27A37
E736J28B37
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1A27Engine Wire and Engine Room J/B (Engine Compartment Left)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)1K27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IE142Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IE42Cowl Side Panel LH
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E540Engine Room Main Wire
SYSTEM OUTLINE
SERVICE HINTS