2001 TOYOTA PRIUS engine

2001 PRIUS (EWD414U)
ILLUMINATION
TAIL RELAY
5±3 : Closed with the light control SW at TAIL or HEAD position
C13 COMBINATION SW
14±16 : Closed with the light control SW at TAIL or HEAD position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A2236F13D34J2437
B936F1838J27A37
C736H737J28B37
C936J1137L137
C10A36J1737M737
C11B36J2137R2A37
C1336J22A37R3B37
F11B34J23B37
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
()
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)2H31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2K31Cowl 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)
ID242Instrument Panel Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
ID42Cowl Side Panel LH
IF42Left Kick Panel
IG42Cowl Side Panel RH
IH42Right Kick Panel
SERVICE HINTS

2001 PRIUS (EWD414U)
TURN SIGNAL AND HAZARD WARNING LIGHT
T5 TURN SIGNAL FLASHER RELAY
1±GROUND : Approx. 12 volts with the ignition SW at ON position
4±GROUND : Always approx. 12 volts
2, 3±GROUND : Changes from approx. 12 to 0 volts with the ignition SW at ON position and
the turn signal SW at LEFT or RIGHT position or the hazard SW at ON position
5±GROUND : Continuity with the ignition SW at ON position and the turn signal SW at LEFT position
6±GROUND : Continuity with the ignition SW at ON position and the turn signal SW at RIGHT position
8±GROUND : Continuity with the hazard SW at ON position
7±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
C1036J1137J2437
C1336J12A37J32A38
F734J13B37J33B38
F834J1737R639
H737J1837R739
J137J2037T537
J437J22A37
J737J23B37
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
()
2F31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2J31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)2K31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
2M31Floor 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)
IA142Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
ID142Instrument Panel Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
ID42Cowl Side Panel LHIE42Cowl Side Panel LH
IG42Cowl Side Panel RH
IH42Right Kick Panel
BI46Left Side of Rear Pillar
BK46Back Panel Center
SERVICE HINTS

2001 PRIUS (EWD414U)
BACK±UP LIGHT
10A
GAUGE FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2C 3
52 31
D 13 D14 C19 C184 1
ID 2D 8
2K 8
BI BKB C
A BB BA BAB IF1 9B BA DAD
IJ1 5
4 16
11A E14
A E
A 4 11 15
MPD2MP2+ MPX±
HTE± HTE+
R±B R±BR±B R±BR±LR±L
R±B
W± G
R±B
R±B R±B
R±B W±BR±B W±B
W± B
W±BW± B W±B
W±B
W± BBRYGR± B GR± LGR GR±B
GR
BACK±UP LIGHT
RELAY B 5
NAVIGATION ECU N 2JUNCTION
CONNECTORB J27 A , J28
REV
JUNCTION CONNECTORB J30 A , J31 JUNCTION
CONNECTOR J22
MPX+ MPX+
MPD1RL
MPX2 MPX1 HTE+ HTE±
JUNCTION
CONNECTOR J11
BODY ECU B 8
A/C AMPLIFIER A 7
GATEWAY ECU G 1
JUNCTION
CONNECTOR J24
BACK±UP LIGHT LH
[REAR COMB. LIGHT LH] R 6
BACK±UP LIGHT RH
[REAR COMB. LIGHT RH] R 7 JUNCTION CONNECTORB J32 A , J33
ENGINE CONTROL MODULED E 9 , E10C5 4
5 4
E 14
D 29 D 19
HYBRID VEHICLE
CONTROL ECUD H13 E , H14
IG A
JUNCTION
CONNECTOR
W±B
J17 B
B
(
SHIELDED)
JUNCTION
CONNECTOR J18
A 14
2A 7
2B 6
IH
BR L
L
B 2B3 B 1
COMBINATION
METERB C10 , C11A
PARK/NEUTRAL
POSITION SW P 1

2001 PRIUS (EWD414U)
With the ignition SW turned on, the current flows to TERMINAL 15 of the body ECU through GAUGE fuse.
Voltage is applied at all times to TERMINAL (A) 11 of the body ECU through the TAIL relay. Coil side, and to TERMINAL (A)
2 through the HEAD relay coil side (w/o daytime running light) or through the daytime running light relay (w/ daytime running
light).
1. NORMAL LIGHTING OPERATION

With the light control SW turned to TAIL position, a signal is input into TERMINAL (A) 18 of the body ECU. Due to this signal,
the current flowing to TERMINAL (A) 11 of the body ECU flows to TERMINAL (A) 18 to TERMINAL 14 of the light control SW
to TERMINAL 16 to GROUND, and taillight relay causes taillights to turn on.

With the light control SW turned to HEAD position, a signal is input into TERMINALS (A) 17 and (A) 18 of the body ECU. Due
to this signal, the current flowing to TERMINAL (A) 2 of the body ECU flows to TERMINAL (A) 17 to TERMINAL 13 of the
light control SW to TERMINAL 16 to GROUND in the headlight circuit, and causes taillight and HEAD relay to turn the lights
on. The taillight circuit is same as above.
2. LIGHT AUTO TURN OFF OPERATION
With light on and ignition SW turned off (Input signal goes to TERMINAL 15 of the body ECU), when the driver's door is
opened (Input signal goes to TERMINAL 3 of the body ECU), the ECU operates and the current is cut off which flows from
TERMINAL (A) 11 of the body ECU to TERMINAL (A) 18 in taillight circuit and from TERMINAL (A) 2 to TERMINAL (A) 17 in
headlight circuit.
As a result, all lights are turned off automatically.
HEAD RELAY
2±1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
Closed with the engine running and the parking brake lever released (Parking brake SW off) [w/ daytime running light]
TAIL RELAY
3±5 : Closed with the light control SW at TAIL or HEAD position
D6 DOOR COURTESY SW LH
1±GROUND : Continuity with the front LH door open
B8 (A), B9 (B) BODY ECU
15±GROUND : Approx. 12 volts with the ignition SW at ON position
3±GROUND : Continuity with the front LH door open
(B) 9±GROUND : Always approx. 12 volts
(A) 1±GROUND : Always continuity
(A) 2±GROUND : Continuity with the light control SW at HEAD position
(A)11±GROUND : Continuity with the light control SW at TAIL or HEAD position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B9B36F13D34J2037
C1336F1838J24A37
D336J1137J25B37
D638J12A37J2737
F11B34J13B37U137
F12C34J1737
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)1F27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2D30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2H31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2K31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
LIGHT AUTO TURN OFF
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA242Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
IB142Floor Wire and Cowl Wire (Cowl Side Panel LH)
ID242Instrument Panel Wire and Cowl Wire (Left Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
ID42Cowl Side Panel LH
IG42Cowl Side Panel RH

2001 PRIUS (EWD414U)
INTERIOR LIGHT
15A
DOME FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
1J 7
2G 2
2N 3
B DBD A EAE 2A4
2 1
BI1 2
B E
A D
112
OFF
ON DOOR
2N 12L62K32K1
11A 12
11B F
A D
IB1 3ID2 13
ID A 16 A 15
BA 13 11
3 6 74
14
BAGR ±B GR ±BL±Y
MPX2 MPD2
PCTY L±Y
L±Y
GR±B GR±L GR GR±B
R±W R±W R±WR±W R±W R±WR R±GR±B R±BL±Y
L±Y L±Y
R±W R±WW±B W± BL±Y L±Y
MPD1
MPX1
MPX+ MPX±BODY ECUB 8 A JUNCTION
CONNECTORB J30 , J31AGATEWAY
ECU G 1
ENGINE CONTROL
MODULE E10
JUNCTION
CONNECTOR J33
PERSONAL LIGHT P 5
INTERIOR LIGHT I16LUGGAGE
COMPARTMENT
LIGHT L 5
DOOR COURTESY SW
REAR LH D 8
DOOR COURTESY SW
REAR RH D 9
DOOR COURTESY SW
FRONT LH D 6
DOOR COURTESY SW
FRONT RH D 7
JUNCTION
CONNECTOR J16LUGGAGE
COMPARTMENT
LIGHT SW L 6
JUNCTION CONNECTORB J12 A , J13 JUNCTION CONNECTORB J30 A , J31
A DA 14
IF1 4
R±W
R±W R±W
LCTY
A
JUNCTION
CONNECTOR J11 9B
R±G
7. 5A
ECU±B
2C 5
F F
R±G
JUNCTION
CONNECTOR J27
FROM POWER SOURCE
SYSTEM (
SEE PAGE 50)
B , B 9
B 1
W±B
E DCTY RCTY LPB
2K 82D 8
W±B

2001 PRIUS (EWD414U)
INTERIOR LIGHT
B8 (A), B9 (B) BODY ECU
3±GROUND : Continuity with front LH door open
6±GROUND : Continuity with rear LH, RH door open
(A)14±GROUND : Continuity with front RH door open
(B) 9±GROUND : Always approx. 12 volts
L6 LUGGAGE COMPARTMENT LIGHT SW
1±GROUND : Closed with the luggage compartment door open
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A736D938J2737
B8A36E1036J30A38
B9B36G137J31B38
C10A36I1638J3338
C11B36J1137L538
D638J12A37L638
D738J13B37P539
D838J1637
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2K31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
2L31Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)2N31Floor 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)
IB142Floor Wire and Cowl Wire (Cowl Side Panel LH)
ID242Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IF142Instrument Panel Wire and Floor Wire (Left Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
ID42Cowl Side Panel LH
IH42Right Kick Panel
BI46Left Side of Rear Pillar
SERVICE HINTS

2001 PRIUS (EWD414U)
MULTIPLEX COMMUNICATION SYSTEM (COMMUNICATION BUS)
MPX1 MPX2
ENGINE
CONTROL
MODULE E10
MPD1 MPD2
GATEWAY
ECU G 1
MP2+ MPX+
A/C AMPLIFIER A 7 MPX± MPX+
COMBINATION
METER C11 MPX+ MPX±
BODY ECU B 8
GR GR±B
GR
GR±B 4 1415
3
4 11 1316
2
11
GR±L