Air Conditioning

From Power Source System (See Page 66) From Power Source System (See Page 66) B

1 1

15A 10A 40A 10A

DOME GAUGE HTR A/C
(HTR)

2 2
1 3C
13 1A 3 29 1A 10 1K

L
R
1 1C

V
Connector
8 1L B Junction
P

5 2
J6

HTR Relay
16 5H B 1 1M
4
R

11 5D 3 1
16 5L
L

19 1A 17 1E 7 1J 5 1N
9 IG2

W- B
7 5D

B
C
11
Y

Connector
V Y C V

Junction
IG2

J10
22 21 BR
C

V
A/C AUTO

Front DEF
Inlet Air

Power
Supply
Circuit

BR
Connector
A

Junction
Blower Motor

J12
BEAN IC (VFD)
M A
B2

1 BR
14 9 25 24 C10
Combination Meter
GR
BR

B- Y
B

Blower Motor Controller

4 IG1 9 IG1
1 A 2 B 1 B
BR
G

B 3(A), B 4(B)

+B M+ M-
4 4C 9 4C

GND S1
3 A 2 A
15 4H 16 4I
W- B

W- B
V

B
7 IA3
GR
V

S 7(A), S 8(B), S 9(C), S10(D)

22 B Skid Control ECU B
SP1
W
FL+ FL- FR+ FR- RL+ RL- RR+ RR-
28 D 22 D 32 A 22 A 35 B 27 B 31 C 23 C V
W

W
G
R

B
L

BR
BR

II IH IJ EC

ABS Speed Sensors

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2005 PRIUS (EWD599U)
 10 9
B B B B
5L 5J
From Power Source System (See Page 66)

E 4(A), E 5(B), E 6(C), E 7(D)

1 Engine Control Module

10A
CHS
W/P WPL NE+ NE- E2 THW TAM CANH CANL G1
15 D 33 A 34 A 28 A 19 A 21 D 31 C 30 C Gateway ECU
2

G
V

BR

W
Connector
3 A

Junction

Ambient Temp. Sensor

R 2 2 CA1H CA1L
G

J14 17 18

Engine Coolant Temp. Sensor

2 2 A
A
(Shielded)

(Shielded)
3 1

W
G
R

B
(Shielded)

Junction Connector
1 1

W
A6
CHS W/P

B
BR

BR
A
Relay

2
Crankshaft Position Sensor

I3 A
5 2 3 EB1

J17
E1

BR
2 2 A
B A B A
BR
V

I3

Connector
L

Junction
C 4(F)
Compressor Assembly (Motor)

J18
V
C7

B A B A

BR
(Shielded)

(Shielded)
W

W
V

B
V
O

1 3H I11(C)

Connector
6 C Inverter 1 F 2 F 3 F B A

Junction
IG OUT OUT OUT

J15
R- W

-W -V -U
O

B A
AC W/P

(Shielded)
Relay

W
B
BR- W
G- W
Y- W

B- W
L- W

STB TOINV TOECU CLK GND

6 14

W- B
5 3H 4 3H 3 3H 5 C 3 C 2 C 4 C 1 C
Connector 3

CANH CANL
W- B

Data Link
W
O

G
R

1
D1

5 C 25 B 24 B 14 C 17 C
Water Pump

WP STB ETI ITE CLK

Motor (A/C)

2
W1

A A
CANL CANH J16
Junction
W- B

W- B

Junction Connector

H14(A), H15(B), H16(C) 9 A 8 A Connector

Hybrid Vehicle Control ECU A
B A
W- B

W
J25

A
J24 A
W- B
E3 Junction
W- B

Connector
A
B B

GR GR

B B

W W

V V
W- B

W- B

EF IH

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2005 PRIUS (EWD599U)
Air Conditioning

G1
Gateway ECU

GTX+ GTX- MPD2 MPD1

6 21 12 3

B
A/C Control Assembly
W
B

GR

GR
8 II1 5 B

A 7(A), A 8(B)
GR

IG
6 5C 7 5C GR 4 5C 8 5C

MPX+ MPX2+
3 B 11 B
6 5E 7 5E 19 13 5J 8 5G
Transmission
MPX1 Control ECU

GR
B
B

B
MPX2
T4

7 4I
W
B

18

4 5
B

TX1+ TX1- 7 4L
Multi- Display

9 II1
(* 1)
GR
M13

31 24
Smart Key ECU

Power Source
Control ECU
GR

MPX1 MPX2
14 4I
(* 2)
W

S11

MPX2 MPX1
P6

32 7
2 4D 8 5J
(*1)

GR
B

GR

8 5K

16 4L 16 13 5G
GR
Key Computer
Transponder

MPX2

MPX1
T5

2 4C 9 1G 13 5D
17

17
W

MPX1
Body ECU

11 4D
B 5(A)

2 IG1 MPX2 3 IG2

15 A
11 4F
B

B B
GR

GR

B B

W W

V V

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2005 PRIUS (EWD599U)
 From Power Source System (See Page 66)

* 1 : w/ Smart Entry System

15A * 2 : w/o Smart Entry System
ECU- B

10 5K 5 1K

Y
D

Connector
3 5J

Junction
J19
D
Y

A 7(A), A 8(B)
A/C Control Assembly 6 B
+B

HR BLW GND TR SGTR RH S5RM S5TS TS TE SGTE

7 B 2 B 1 B 8 A 22 A 9 A 10 A 12 A 21 A 7 A 5 A
W- B

GR

BR
W

G
R
B

Y
10 5J 11 5J 12 5J

11 5L 4 5D 3 5D

1 2 3 4

BR
THR GND VO S5
LG
B

6 IG2 7 IG2

A9
A/C Room Temp. Sensor
GR

BR

1 2
A/C Thermistor
A/C Solar Sensor

A11
A10

1
2

B
W- B

V V

IJ

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2005 PRIUS (EWD599U)
Air Conditioning

A 7(A), A 8(B)
A/C Control Assembly

TPM SGTPM S5TPM AOF AOD PSW ST1 SGST ST2

18 A 23 A 11 A 16 B 24 B 6 A 2 A 15 A 1 A

BR
LG

LG
O

G
R
P

7 5J 15 5J 16 5J 14 5J

5 5H 14 5B 4 5B 15 5B

3 2 1 4 5
PT GND VZ MFACE MDEF

SB
W
G

M 10 3 9
6 IA2 AC1 EAC AC2

A16
Air Vent Mode Control Servo Motor
R

Front DEF A/C AUTO

4
Rear DEF TEMP+

TEMP-
Pressure SW
P1

Inlet Air
1
C12
Combination SW
W- B

V V

EA

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2005 PRIUS (EWD599U)
 FAN NO. 1 Relay
FAN NO. 2 Relay

FAN NO. 3 Relay

Combination SW

MIR HTR Relay

DEF Relay
P

BR

BR
LG
G

P
L
A 7(A), A 8(B)
A/C Control Assembly 4 B 14 B 15 B 12 B 25 A 17 A
WIP RF CF RrDEF HTR2 HTR

TP SGTP S5TP AMC AMH TP1 SGTPI S5TPI AIR AIF IDH
20 A 14 A 13 A 19 B 17 B 19 A 4 A 3 A 22 B 23 B 18 B
LG

G
R
P

V
L

L
6 5J

4 5H

3 2 1 4 5 3 2 1 4 5
PT GND VZ MCOOL MHOT PT GND VZ Mrec Mfrs

R
M M
5 IA2

A15 A14
Air Mix Control Servo Motor Air Inlet Control Servo Motor

V
Converter

V V

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2005 PRIUS (EWD599U)
Air Conditioning

From Power Source System (See Page 66)

1 1 1

30A PTC 30A PTC 50A

HTR2 HTR1 PS HTR

2 2 2

3 3 1 3B

BR

B
W
R

J10
Junction Connector
D V

D D D

2 2

2 2 2 2
1 3

1 3 1 3 PTC HTR
Relay
PTC PTC
HTR 2 HTR 1
BR

Relay Relay 2 5
P

2 5 2 5
2 2

2 2 2 2 11 IJ3 10 IJ3
P

L
BR

BR

BR
Y

P
L

D
D D BR

J6
Junction
Connector
L

P12
3 PTC Heater 1
W+ R+
1
LR P13
PTC Heater

B- B- WB
2 4 2
W- B

W- B

W- B

E1
W- B

V
W- B

EA

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2005 PRIUS (EWD599U)
 System Outline
Air conditioning system operates when SW of multi-display or that of steering wheel is turned on. Turning on the SW sends
signal to A/C control assembly, running the air conditioning system.
1. Heater Blower Operation
Manual operation
When the blower speed is set to a certain level using the blower control SW, the A/C control assembly sends the signals to
the blower control to control the blower motor speed.
Auto operation
When the auto SW is pushed, the A/C control assembly calculates necessary blower speed from setting of SWs and input of
the sensors and sends the signals to the blower control to automatically control the blower motor speed.
2. Air Inlet Control Servo Motor Control
When the FRESH/RECIRC select SW is set to RECIRC, the air inlet control servo motor starts rotating to move the damper
toward the RECIRC side. The damper position is detected by the TERMINAL TPI of the A/C control assembly. The motor
continuously rotates until the damper reaches its stop position. When the FRESH/RECIRC select SW is set to FRESH, the
air inlet control servo motor starts rotating to move the damper toward the FRESH side. The damper position is detected by
the TERMINAL TPI of the A/C control assembly. The motor continuously rotates until the damper reaches its stop position.
In auto mode, A/C control assembly controls the damper to move to the best position for the conditions without operating the
mode select SW.
3. Air Vent Mode Control Servo Motor Control
When the mode select SW is pushed, the ECU in the A/C control assembly activates the air vent mode control servo motor.
The servo motor rotates to the position (FACE, BI-LEVEL, FOOT, FOOT/DEF, DEF) selected by using the mode select SW,
and moves the damper.
In auto mode, A/C control assembly controls the damper to move to the best position for the conditions without operating the
mode select SW.
4. Air Mix Control Servo Motor Control
Based on the set temperature by the temperature control SW, the ECU in the A/C control assembly sends a signal to the air
mix control servo motor. This signal drives the motor to reach the temperature set by the temperature control SW, and moves
the film damper.
5. Humidity Sensor Control
A/C control assembly detects humidity in passenger room when A/C is turned on, with humidity detecting function of
A/C room temp. sensor and controls to dehumidify for comfortable condition
6. Air Conditioning Operation
A/C control assembly calculates target cooled temperature from information such as that of operating SWs, room
temperature, humidity, ambient temperature and insolation to have target running speed of compressor assembly (Motor).
The calculated control signal is sent to inverter to drive compressor assembly (Motor) (Electric motor) with control of inverter,
resulting in operating A/C.

Service Hints
P1 Pressure SW
1-4 : Open with the refrigerant pressure at less than approx. 196 kpa (2.0 kgf/cm2, 28.4 psi) or more than
approx. 3140 kpa (32 kgf/cm2, 455 psi)
A8 (B) A/C Control Assembly
(B) 6-Ground : Always approx. 12 volts
(B) 5-Ground : Approx. 12 volts with the power SW at IG ON position
(B) 1-Ground : Always continuity

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2005 PRIUS (EWD599U)
Air Conditioning
: Parts Location
Code See Page Code See Page Code See Page
A6 44 E1 44 J19 48
A7 A 46 E4 A 47 J24 48
A8 B 46 E5 B 47 J25 48
A9 46 E6 C 47 M13 48
A10 46 E7 D 47 P1 45
A11 46 G1 47 P6 49
A14 46 H14 A 47 P12 49
A15 46 H15 B 47 P13 49
A16 46 H16 C 47 S7 A 49
B2 46 I11 C 45 S8 B 49
B3 A 46 J6 48 S9 C 49
B4 B 46 J10 48 S10 D 49
B5 A 46 J12 48 S11 49
C4 F 44 J14 48 T4 49
C7 44 J15 48 T5 49
C10 47 J16 48 W1 45
C12 47 J17 48
D1 47 J18 48

: Relay Blocks

Code See Page Relay Blocks (Relay Block Location)

2 27 Engine Room R/B No.2 (Right Side of Reserve Tank)
3 22 Engine Room R/B (Engine Compartment Left)

360
2005 PRIUS (EWD599U)
 : Junction Block and Wire Harness Connector

Code See Page Junction Block and Wire Harness (Connector Location)
1A
28 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1C
1E
1G 28
1J
1K Instrument Panel Wire and Driver Side J/B (Lower
( Finish Panel))
1L
29
1M
1N
3B
23
3C Engine
g Room Main Wire and Engine
g Room J/B (Engine
( g Compartment Left))
3H 24
4C
4D
4F
36 Instrument Panel Wire and Center Connector No.1
No 1 (Behind the Combination Meter)
4H
4I
4L
5B
5C
5D
5E
5G 40 Instrument Panel Wire and Center Connector No.2 ((Instrument Panel Brace RH))
5H
5J
5K
5L

: Connector Joining Wire Harness and Wire Harness

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB1 54 Engine Wire and Engine Room Main Wire (Inside of the Engine Room R/B)
IA2
56 Engine Room Main Wire and Instrument Panel Wire (Upper Parts of Front Body Pillar LH)
IA3
IG1
58 Instrument Panel Wire and Instrument Panel No
No.2
2 Wire (Behind the Combination Meter)
IG2
II1 58 Engine Wire and Instrument Panel Wire (Behind the Glove Box)
IJ3 58 Engine Room Main Wire and Instrument Panel Wire (Behind the Glove Box)

: Ground Points

Code See Page Ground Points Location

EA 54 Right Side of the Fender Apron
EC 54 Engine Block
EF 54 Left Side of the Suspension Tower
IH 56 Cowl Side Panel LH
II 56 Instrument Panel Brace LH
IJ 56 Instrument Panel Brace RH

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2005 PRIUS (EWD599U)
Air Conditioning
: Splice Points

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E1 I3 58 Engine
54 Engine Room Main Wire
E3

362
2005 PRIUS (EWD599U)
 Memo

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2005 PRIUS (EWD599U)