2001 TOYOTA PRIUS instrument panel

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

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

I18389
A/C Amplifier
IG A71
GND A77
F18
FL Block No. 2
BatteryInstrument Panel J/B
I15
Ignition
SW J20
J/C
C
R C
R 2D3
2H1
2D6
2K8
2B3
8
2D HTR
IG1 Relay
AM1B±Y
J/C 35
21
4
IG1
AM1
2
W
J25A
J24A
A
J11
J/C
ID MAINFL Block No. 1
F111
F131
4DC/DC
B±GW±B
W±B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±921
2001 PRIUS (RM778U)
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the A/C amplifier (contains the ECU) and servomotors, etc.
WIRING DIAGRAM
DI7SI±01

I18410
Instrument Panel J/B
HTR Fuse
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±923
2001 PRIUS (RM778U)
3 Check HTR fuse.
PREPARATION:
Remove HTR fuse from instrument panel J/B.
CHECK:
Check continuity of HTR fuse.
OK:
Continuity exists.
NG Check for shot in all the harness and compo-
nents connected to the HTR fuse.
OK
Check and repair harness and connector between A/C amplifier and battery.

I18385
A/C Amplifier
A78 ECU±B
F
1W
F11
FL Block No. 1 DC/DC
Battery+B Instrument Panel J/B
R±G J25
J/C
MAINR±GF
2C5
2H1
1F13
B±G
F18
FL Block No. 2 DI±924
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
Back Up Power Source Circuit
CIRCUIT DESCRIPTION
This is the back±up power source for the A/C amplifier. Power is supplied even when the ignition switch is
off.
WIRING DIAGRAM
DI7SJ±01

I18172
+B
(+) (±)
I18410
ECU±B Fuse Instrument Panel J/B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±925
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminal +B of A/C amplifier connector and body ground.
PREPARATION:
Remove A/C amplifier with connectors still connected.
CHECK:
Measure voltage between terminal +B of A/C amplifier connec-
tor and body ground.
OK:
Voltage : 10 ± 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±874).
NG
2 Check ECU±B fuse.
PREPARATION:
Remove ECU±B fuse from instrument panel J/B.
CHECK:
Check continuity of ECU±B fuse.
OK:
Continuity exists.
NG Check for short in all the harness and compo-
nents connected to the ECU±B fuse (See page
IN±41).
OK
Check and repair harness and connector between A/C amplifier and battery.