2001 TOYOTA PRIUS relay

DI2BM±11
I15588
P9 Power Window
Master SW
Instrument Panel J/B
J20
J/C5
1
IG CPUB
B L±Y 1
IG1
C4 W±R
R±L 3
IC1
8
IC1 L±Y L±YC
J25 B
J24 4
2D 2
2G
W±R
R±L
C
R±L 20A PWR1
5A AM1
I15 Ignition SwitchIG1 Relay
IG1 AM1
B±Y W±G11
2J
1
2H
3
2B
24
L±Y
6
2D12 3
510A GAUGE
10
2K
W
15A DOME
7
1J8
2K
Engine Room J/B
2
1BBFL Block No. 1
1
F11100A DC/DC
B±G
F18 FL Block No. 2
120A MAIN 1
F121
F13
1
Battery
ID IGA J11 J/C
W±B
J17 J/CW±B1
IC1
W±B9
E Instrument Panel J/B
AJ/C DI±740
± DIAGNOSTICSDRIVER DOOR CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the driver door ECU.
WIRING DIAGRAM

I15474
GR±B4 A7
A/C Amplifier C11
Combination MeterG1
Gateway ECU
B8
Body ECUE11
Engine Control Module
15MP2+
MPX+ GR4 11
3 2
MPX+MPX±
MPX1 MPX±
MPX2MPX1 GR±B
1613
GRGR±L11 14
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±779
2001 PRIUS (RM778U)
DTC B1266 / 66 Instrument panel system communica-
tion bus malfunction (+B short)
DTC B1267 / 67 Instrument panel system communica-
tion bus malfunction (GND short)
CIRCUIT DESCRIPTION
This DTC is output when +B or GND short occurs on instrument panel system communication bus. If +B or
GND short is detected on instrument panel system communication bus, separate it by bus cut relay in body
ECU to prevent while communication buses' failure.
WIRING DIAGRAM
DI7O3±01

I17118
2C8
IG1 RelayJ26 7.5 A ECU±B
H
R±G Instrument Panel J/B
5A ECU±IGBATT
IG
W±BGND G1
Gateway ECU
J25F
R±G
2I2 5A AM1 2C
2HJ/C
D
2 B±Y
J21
Instrument Panel J/BW±B 5
J19
J/C 3
ID1 1
B±Y 2D2
EJ19
J/C
W±B J20D E
A
AW±B
2K8
2D8
W±BA
J11
J/CID14 IG148
E7
CG J/C
A
J22
J/CAW±B 2B
2K8
2D6
D Instrument Panel J/B
5
B±YD J14
J/C
D 3 5
2 1ACC 9
GR±R GR±R
J26C
J25CJ/C
10A ACCACC Relay
3 5
2 1
I15 Ignition Switch
AM1
ACC 2
3
BatteryF18 FL Block No.2100A DC/DC1 FL Block No.1
F13 1
F11
W
J11
J/C
ID120A MAIN FL
W±B
W±B
A1B±GB±Y P±LR±G
W
W±GB±Y DI±792
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2001 PRIUS (RM778U)
WIRING DIAGRAM

DI7S3±01
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±879
2001 PRIUS (RM778U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Whole function of the does not operate3. A/C amplifier
4. IG power source circuitIN±41
DI±916
Air Flow Control: No blower operation1. IG power source circuit
2. Heater main relay circuit
3. Blower motor circuit
4. A/C amplifierDI±916
DI±921
DI±924
IN±41
Air Flow Control: No blower control1. Heater main relay circuit
2. Blower motor circuit
3. A/C amplifierDI±921
DI±924
IN±41
Air Flow Control: Insufficient air flow1. Blower motor circuitDI±924
Temperature Control: No cool air comes out1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Compressor circuit
5. Pressure switch circuit
6. Compressor lock sensor circuit
7. Air mix damper position sensor circuit
8. Air mix damper control servomotor circuit
9. Room temperature sensor circuit
10.Ambient temperature sensor circuit
11. A/C amplifierAC±3
AC±15
AC±3
DI±927
DI±894
DI±891
DI±897
DI±906
DI±874
DI±879
IN±41
Temperature Control: No warm air comes out1. Air mix damper position sensor circuit
2. Air mix damper control servomotor circuit
3. DC/DC converter circuit
4. PTC heater circuit
5. Room temperature sensor circuit
6. Ambient temperature sensor circuit
7. Evaporator temperature sensor circuit
8. A/C amplifierDI±897
DI±906
DI±934
DI±937,
DI±942
DI±876
DI±882
DI±885
IN±41
Temperature Control: Output air is warmer or cooler that the set
temperature or response is slow1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Radiator fan and condenser fan circuit
5. Solar sensor circuit
6. Room temperature sensor circuit
7. Ambient temperature sensor circuit
8. Evaporator temperature sensor circuit
9. Air mix damper position sensor circuit
10.Air mix damper control servomotor circuit
11. Evaporator
12.Heater radiator
13.Expansion valve
14.A/C amplifierAC±3
AC±15
AC±3
DI±947
DI±888
DI±876
DI±879
DI±885
DI±897
DI±906
AC±28
AC±28
AC±52
IN±41
Temperature Control: No temperature control (only Max. cool or
Max. warm)1. Room temperature sensor circuit
2. Ambient temperature sensor circuit
3. Air mix damper position sensor circuit
4. Air mix damper control servomotor circuit
5. A/C amplifierDI±876
DI±882
DI±897
DI±906
IN±41
No air inlet control1. Air inlet damper position sensor circuit
2. Air inlet damper control servomotor circuit
3. A/C amplifierDI±900
DI±909
IN±41

I08340
J1
J/CL±Y
A3
A/C Dual Pressure
SwitchA/C amplifier
W±B
IE1
A811
PSW
4
ED 115
A W±B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±899
2001 PRIUS (RM778U)
DTC 23 Pressure Switch Circuit
CIRCUIT DESCRIPTION
This pressure switch sends the appropriate signals to the A/C amplifier when the A/C refrigerant pressure
drops too low or rises too high. When the A/C amplifier receives these signals, if outputs signals via the A/C
amplifier to switch off the compressor relay and turns the magnetic clutch off.
DTC No.Detection ItemTrouble Area

Open inpressure sensor circuit
Pressure switch
23

Open in pressure sensor circuit.

Abnormal refri
gerant pressure.
Pressure switch

Harness or connector between pressure switch and A/C am-
lifi23
Abnormal refrigerant ressure.
below 196 kPa (2.0 kgf/cm2. 28 psi)2
plifier


Refrigerantpipe lineover 3,140 kPa (32.0 kgf/cm2. 455 psi)
Refrigerant pipe line

A/C amplifier
WIRING DIAGRAM

DI7SB±01

I18391
A/C Amplifier
AMC A914
W II19
AMH A913
IG A71
GND A77 L
F18
FL Block No. 2
BatteryA15
Air Mix Control
Servomotor
Instrument Panel J/B
I15
Ignition
SW 4
BR±R
J20
J/C
C 5
W II1 10
C
R R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
214
W±GIG1
AM1
2 W
W±B J25A
J24A
W±B
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
1
DC/DC
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±911
2001 PRIUS (RM778U)
DTC 41 Air Mix Control Servomotor Circuit
CIRCUIT DESCRIPTION
This air mix control servomotor is controlled by the A/C amplifier and moves the air mix damper to the desired
position.
DTC No.Detection ItemTrouble Area

Air mix control servomotor.
41Air mix damper position sensor value does not change even if
Air mix control servomotor.

Air mix damper position sensor.
H t b t A/C lifi d i i41Air mix dam er osition sensor value does not change even if
A/C amplifier operates air mix control servomotor.
Harness or connector between A/C amplifier and air mix con-
trol servomotor, air mix damperposition sensor.trol servomotor, air mix damper position sensor.

A/C amplifier.
WIRING DIAGRAM
DI7SF±01

I18403
A/C Amplifier
AIF A922
W
AIR A921
IG A71
GND A77
F18
FL Block No. 2
BatteryA15
Air Inlet Control
Servomotor
Instrument Panel J/B
I15
Ignition
SW 4
J20
J/C
C 5W
C
R R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
214
W±GIG1
AM1
2 W
W±B J23A
J22A
W±B
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
1DC/DC
B±G DI±914
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
DTC 42 Air Inlet Control Servomotor Circuit
CIRCUIT DESCRIPTION
The air inlet control servomotor is controlled by the A/C amplifier and moves the air inlet damper to the de-
sired position.
DTC No.Detection ItemTrouble Area

Air inlet damper position sensor
42Air inlet damper position sensor value does not change even if
A/C amplifier operates air inlet control servomotor

Harness or connector between air inlet control servomotor
and A/C amplifierA/C amplifier operates air inlet control servomotor.and A/C amplifier

A/C amplifier
WIRING DIAGRAM
DI7SG±01

I18391
A/C Amplifier
AOF A910
W II12
AOD A910
IG A71
GND A77 L
F18
FL Block No. 2
BatteryA16
Air Outlet
Servomotor
Instrument Panel J/B
I15
Ignition
SW 4
BR±R
J20
J/C
C 5
W II11
C
R R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
214
W±GIG1
AM1
2 W
W±B J23A
J22A
W±B
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
1DC/DC DI±918
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
WIRING DIAGRAM