TOYOTA PRIUS 2001 Service Repair Manual

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

I18150
FRSREC
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±915
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Actuator check.
PREPARATION:
(a) Remove glove compartment door to see and check the air
inlet damper operation.
(b) Set to the actuator check mode (See page DI±866).
(c) Operate the temperature control switch and change it to
step operation.
CHECK:
Operate the temperature control switch and check the opera-
tion air inlet damper.
OK:
Temp. setting °C (°F)Air Inlet Damper
Max. COOL e 20.5 (66)REC
21.0 e 26.0 (67 e 77)REC/FRS
26.5 (78) e Max. WARMFRS
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±874).
NG

I19081
To FRS
4
5
I19082
To REC
4
5
(+) (±)
DI±916
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
2 Check air inlet control servomotor.
PREPARATION:
Remove air inlet control servomotor (See page AC±33).
CHECK:
Connect positive (+) lead from the battery to terminal 4 and neg-
ative (±) lead to terminal 5.
OK:
The lever moves smoothly to FRS position.
CHECK:
Connect negative (+) lead from the battery to terminal 5 and
positive (±) lead to terminal 4.
OK:
The lever moves smoothly to REC position.
NG Replace air inlet control servomotor assembly.
OK
3 Check harness and connector between A/C amplifier and air inlet control servo-
motor (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±917
2001 PRIUS (RM778U)
DTC 43 Air Outlet Damper Control Servomotor Cir-
cuit
CIRCUIT DESCRIPTION
This circuit turns the servomotor and changes each mode damper position by the signals from the A/C ampli-
fier. When the AUTO switch is on, the A/C amplifier changes the mode automatically between (FACE), (BI±
LEVEL) and (FOOT) according to the temperature setting.
DTC No.Detection ItemTrouble Area

Air outlet damper control servomotor.
43Air outlet damper position sensor value does not change even
Air outlet dam er control servomotor.

Air outlet damper position sensor.
H t bt A/C lifi i tltd43Air outlet dam er osition sensor value does not change even
if A/C amplifier operated air outlet damper control servomotor.
Harness or connector between A/C amplifier air outlet damper
control servomotor, air outlet damperposition sensor.control servomotor, air outlet damper position sensor.

A/C amplifier.
DI7SH±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

Temp. setting °C (°F) Air Flow
FACE
B/L
FOOT
FOOT/DEFDEF
Max. COOL e 20.5 (66)
21.0 e 23.5 (67 e72)
24.0 e 26.0 (73 e77)
26.5 e 29.0 (78 e83)
29.5 (84) eMax. WARM
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±919
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Actuator check.
PREPARATION:
(a) Set to the actuator check mode (See page DI±866).
(b) Press the DEF switch and change to step operation.
CHECK:
Press the DEF switch in order and check the condition of air flow
mode.
OK:
The mode changes with the change in the tempera-
ture setting as shown in the table.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±874).
NG

I19083
To FACE
4
5
I19084(+) (±) To FACE
4
5
DI±920
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
2 Check air outlet control servomotor.
PREPARATION:
Remove air outlet control servomotor (See page AC±57).
CHECK:
Connect positive (+) lead to terminal 4 and negative (±) lead to
terminal 5.
OK:
The lever moves smoothly to FACE position.
CHECK:
Connect positive (+) lead to terminal 5 and negative (±) lead to
terminal 4.
OK:
The lever moves smoothly to DEF position.
NG Replace air outlet servomotor.
OK
3 Check for open and short in harness and connector between A/C amplifier and
air outlet servomotor (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.

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

I18168
IG
(±) (+) ON
I18167
GND
(±) (+)
DI±922
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminals IG and GND of A/C amplifier connector.
PREPARATION:
(a) Remove center cluster module control with connectors
still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG and GND of A/C amplifi-
er.
OK:
Voltage : 10 ± 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±874).
NG
2 Check continuity between terminal GND of A/C amplifier and body ground.
CHECK:
Measure resistance between terminal GND of A/C amplifier and
body ground.
OK:
Resistance : Below 1 W
NG Repair or replace harness or connector.
OK

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.