air conditioning TOYOTA PRIUS 2001 Service Repair Manual

*The titles given inside the components are the names of the terminals (terminal codes) and are not treated as being
abbreviations.
2001 PRIUS (EWD414U)
ABBREVIATIONS D
ABBREVIATIONS
The following abbreviations are used in this manual.
ABS = Anti±Lock Brake System
A/C = Air Conditioning
COMB. = Combination
DC = Direct Current
ECU = Electronic Control Unit
EMPS = Electric Motor Power Steering
ESA = Electronic Spark Advance
EVAP = Evaporative Emission
HV = Hybrid Vehicle
J/B = Junction Block
LH = Left±Hand
PTC = Positive Temperature Coefficient
R/B = Relay Block
RH = Right±Hand
SFI = Sequential Multiport Fuel Injection
SRS = Supplemental Restraint System
SW = Switch
TEMP. = Temperature
VSV = Vacuum Switching Valve
w/ = With
w/o = Without

2001 PRIUS (EWD414U)
AIR CONDITIONING
50A
HTR FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
23 415
1K 81J13 1A51F3 32 51
1F 4
A A A A
B A
2 1
3 3
25 13
33
1 2
IE4
1 1K 3
IE1 8
IE113
E 5
L
L±R
W±B W± BL±R
W±BV R B±L LG±RL±O
R
R
B±R
L±O
B±L
LG±R
R
W±B B±W
B±R
VB±R
L±Y L±YW±B
W±B
W±B W±B
12 3B
AAAA
A A 4BB
BLOWER MOTOR
LINEAR CONTROLLER B 7
JUNCTION
CONNECTOR J 7 JUNCTION
CONNECTOR J 6
BLOWER
MOTOR B 6
WAT ER PU MP
MOTOR (
A/C) W 2
JUNCTION
CONNECTOR J 1
A/C DUAL PRESSURE SW A 3JUNCTION
CONNECTORB J 2 A , J 3
2
HTR
RELAYCLR MG
RELAY
W±B
LG±R
RA/C W/P
RELAY 1
GNDSI +B VMM
M

2001 PRIUS (EWD414U)
AIR CONDITIONING
2F 6
A 11 A4D 14 D13 C23
D 3D22 B18
B 4B5IA2 5
1 2
C 5 C 6
M C 20 C18 C19 C22 C21
1 34 18
211
2 12345
L±O
GR±B
GR GR
GR±B
LG
P±G
BR W±G
W±G BR±W W W
W
W
W
W
W
GR±L
W
COMBINATION METER C11
GATEWAY ECU G 1
AMBIENT TEMP. SENSOR A 6 ENGINE CONTROL MODULEC E 8 B , E 9
MPX± MPD1 HRLY MPX+MPX±
MEO2 ACT E2
S5TS TS SGTPI S5TPI TPI AIF AIR MPX+ MPD2 MPX1 MPX2 TAM
MPX+ MP2+ NE ACT
D , E10 A/C SOLAR
SENSOR A11
AIR INLET CONTROL SERVO MOTOR A14 C , A 9 AA 8, A 7 B
A/C AMPLIFIER BODY ECUB 8 A
A 15A 16
IK1 2

2001 PRIUS (EWD414U)
AIR CONDITIONING
30A
HTR2 FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
330A
HTR1
3
33 33
33 33
B 6B 1315 23
25 13 3 1
5 2
3 33 3 2G 810A
GAU GE
3
IE118
IA1 1IA15
ID C , A 9 AA 8, A 7 B
A/C AMPLIFIERP
P±BPR±L R±L
P±B
R±L
G
G±W
B±R W±B
W±B W±B
W±B
JUNCTION
CONNECTOR J11 AA
L±R
HTR1
RELAY HTR2
RELAY HTR3
RELAY11
22
P±B
IE116
IE
W±B
JUNCTION
CONNECTOR J 1 A 1
50A
HTR3
2
HTROHTR2B 1 B 3
B 2 B 4PTC HEATERB P 3 , P 4A A 1
A 2
W±B
G±R
L±Y

2001 PRIUS (EWD414U)
AIR CONDITIONING
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E540Engine Room Main Wire

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.

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.

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.

SYSTEM INDEX
M OVERALL ELECTRICAL WIRING DIAGRAM
2001 PRIUS (EWD414U)
SYSTEMS LOCATION SYSTEMS LOCATION
ABS 19±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning 24±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back±Up Light 6±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 11±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combination Meter 23±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Lock Control 15±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electric Tension Reducer 13±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EMPS 20±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Control 2±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gateway System 14±8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight (w/ Daytime Running Light) 4±2. . . . . . . . . . . . . . . . . . . . . . . . . .
Headlight (w/o Daytime Running Light) 3±2. . . . . . . . . . . . . . . . . . . . . . . . .
Horn 12±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hybrid Vehicle Immobiliser System 2±16. . . . . . . . . . . . . . . . . . . . . . . . . . .
Illumination 8±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Light 10±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Reminder and Light Reminder Buzzer 9±2. . . . . . . . . . . . . . . . . . . . . .
Light Auto Turn Off 9±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Navigation System 14±5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Source 1~24±1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Window 18±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radiator Fan and Condenser Fan 22±3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio and Player 14±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Window Defogger 22±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Mirror 11±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Belt Warning 9±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift Lock 13±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SRS 21±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Light 3±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Taillight 7±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft Deterrent 17±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOYOTA Hybrid System 1±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* Charging
* Cruise Control
* Regenerative Brake
Turn Signal and Hazard Warning Light 5±2. . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper and Washer 12±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wireless Door Lock Control 16±2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2001 PRIUS (EWD414U)
M
16 C 4A 5D 10C 18C 19C 28C 27C
From Hybr id Vehicle
Co nt r ol ECU< 1 ±9>
2 PRIUS (
Cont' d)
13
1416 153D 22D
See Air
Conditioning
System< 24±6>
1EA1
1
2 1
2 1 28 A 10 A 24 B 16 B
AA AA AA AA17 B 21 A 31 A 3 A 9 A
AB AB AB
D
E A
C
EB Engine block
EAEngine block11 ID2FA
HB
8ID1
8ID2
9ID1 10 ID2
(
*1)
(
*1)KNK1 G2 FAN SPD SPHV HTE±From FAN NO. 1 and
FAN NO. 2 Rel ay
< 22±3> To Combination Meter
< 23±2>
LG V± WO BRY
PL
R± Y
IDCowl si de
panel LH HTE+ ETH+ ETH±
NE± NE+ E1 E0 1 E0 2 E0 3 ME01
BBR G G R
G BR W±B W±B W±B W±B
BR W±B W±B W±B W±B
K 1
KNOCK SENSOR C 1
CAMSHAFT POSITION
SENSOR C 6
CRA NKS HAFT POSI TI ON
SENSORJUNCTION
CONNECTORB A J 8 J 9,
NEO ACT ESTP
(
*1)(
*1) (
*1)
R±G
B±W
B± WR±G
B± R B± W
R± G
B± W LG±BR± WL±B
W± B W± B
LG±BL±B
W±B
R± G
J11
JUNCTI ON
CONNECTOR T 4
TRANSPONDER
KEY COMPUTER
EB
AA
7B 8C
IF Left kick panel
RADI O A ND PL AYE RC B R 3 R 4,
C 7
CENTER CLUSTER
SW
I ND GND CTY KSWIG +BD HEVC
To Hybrid Vehic le
Control ECU< 1±20>To Door Court esy SW
Front LH< 10±2> To Unloc k Warning
SW< 9±2> < 15±3>
6A
A 4A
J27 J28,
JUNCTION
CONNECT ORAB
J10
JUNCTI ON
CONNECTOR
2138
51267LG±BBRBR
A
A
J20
J UNCTI ON
CONNE CTOR JUNCTI ON CONNECTORB A J27 J28,
* 1 : Shielded
Engine ControlHybrid Vehicle Immobiliser System
BB±R
E 7 E 8,
E NGI NE CONTROL MODULEAB
(
*1)
BR BR
(
*1) (
*1) R± G
E 9 , C E10, D
B±R
23 C
TAM
BR
(
*1) (
*1)B
B
L±BJ20
J UNCTI ON
CONNECTOR 21 C
GO
G
9IA2
G