Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 22 systemci 057macfr
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MANUAL AIR CONDITIONING (FRONT)
FROM POWER SOURCE SYSTEM (SEE PAGE 52) Y- G Y- G
5
2 L- W L- W
FUSIBLE LINK
50A HTR
10A 5A
HEATER A/C
2 2C
BLOCK
F8
1
6
3 1R 2 1W 5 6 2K
B
R- L R- L
R- L
20
R- L B B R- L R- L
IK3
1 IK7
J8
B- R
9 3C 20 3C JUNCTION
CONNECTOR
21 3D 20 3D
R- L
B R- L R- L
R- L
4 4 1 BR- B 4
1 3 R- L 5 8 W- B
4 FRONT 2 BR- W 3
HEATER
RELAY
A31 R25
AIR INLET CONTROL AIR INLET W- B
2 5
SERVO MOTOR CONTROL SW
[REAR WINDOW
4 4 4 DEFOGGER SW]
L- W
B- R
W- B
W- B
B- R
2
W- B
W- B
W- B
B3
L- W
M BLOWER
J3 B
MOTOR
B4 A A A A B A B A
CONNECTOR
1 BLOWER RESISTOR
JUNCTION
B- W 2 3 J2 A ,
B B
5 1
B- W
L- B
L- O
W- B
W- B
B5
5 8 4 BLOWER SW
HI M2 M1 LO OFF
3 L- W
1 W- B
IJ ED
2001 SIENNA (EWD420U)
230
Y- G
Y- G
L- W
6
OFF OFF
1
1 5 ON ON
A/C SW MODE SW
FAN NO. 3
RELAY
2 3
R- L
1
R- L A10
4 5
1 A/C SW
A/C DUAL PRESSURE SW
A/C MAGNETIC CLUTCH
4 1
R- G
R- B
AND LOCK SENSOR
B- W
W- L
L
A2
2
A3
4
W- B
W- R
L- Y
5 EB1
21 IK3 19 IK3 9 IK3 22 IK3 E9 B
ENGINE CONTROL
MODULE
W- R
L
CONNECTOR
C
JUNCTION
C
ACMG A/C TACH
J17
C
CONNECTOR
C 6 B 7 B 27 B
JUNCTION
W- R
W- L
LG- B
J8
C
2
C
A/C THERMISTOR
W- R
R- W
W- B
B- W
B- Y
R- L
L- Y
L
C J7
1 JUNCTION
CONNECTOR
A11
LG- B
L- W
R- G
R- B
6 4 3 13 14 15 11 16 12 10 9 2 5
GND IG PRS FAN MGC SG1 F- TE LOCK LED F- A/C ACT AC1 IGN
A8
A/C AMPLIFIER
2001 SIENNA (EWD420U)
231
MANUAL AIR CONDITIONING (FRONT)
SYSTEM OUTLINE
1. HEATER BLOWER MOTOR OPERATION
Current is applied at all times through the HTR fuse to TERMINAL 1 of the front heater relay.
When the ignition SW is turned on, the current flows through HEATER fuse to TERMINAL 3 of the front heater relay to
TERMINAL 5 to TERMINAL 3 of the blower SW.
Low speed operation
When the blower SW is moved to LO position, the current flows the to TERMINAL 3 of the blower SW to TERMINAL 1 to
GROUND, causing the front heater relay to turn on. This causes the current to flow from the HTR fuse to TERMINAL 1
of the front heater relay to TERMINAL 2 to TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 2 of the
blower resistor to TERMINAL 3 to GROUND, rotating the blower motor at low speed.
Medium speed operation (Operation at M1, M2)
When the blower SW is moved to M1 position, the current flows to TERMINAL 3 of the blower SW to TERMINAL 1 to
GROUND, causing the front heater relay to turn on. This causes the current flows from the HTR fuse to TERMINAL 1 of
the front heater relay to TERMINAL 2 to TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 2 of the blower
resistor to TERMINAL 1 to TERMINAL 4 of the blower SW to TERMINAL 1 to GROUND. At this time, the blower
resistance of the blower resistor is smaller than at low speed, so the blower motor rotates at medium low speed.
When the blower SW is moved to M2 position, the current through the motor flows from TERMINAL 2 of the blower
resistor to TERMINAL 5 to TERMINAL 8 of the blower SW to TERMINAL 1 to GROUND. At this time, resistance of the
blower resistor is smaller than at M1 position, so the blower motor rotates at medium high speed.
High speed operation
When the blower SW is moved to HI position, the current flows to TERMINAL 3 of the blower SW to TERMINAL 1 to
GROUND, causing the front heater relay to turn on.
This causes the current to flow from the HTR fuse to TERMINAL 1 of the front heater relay to TERMINAL 2 to
TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 5 of the blower SW to TERMINAL 1 to GROUND,
rotating the blower motor at high speed.
2. AIR CONDITIONING OPERATION
When the blower SW is set on, the current from the HEATER fuse flows to TERMINAL 1 of the A/C dual pressure SW to
TERMINAL 4 to TERMINAL 3 of the A/C amplifier. The engine RPM signal from the Engine Control Module, the evaporator
temp. signal from the A/C thermistor and the lock signal from the lock sensor are all supplied to the A/C amplifier.
When the A/C SW is turned on, a signal is sent to the A/C amplifier. The current flows from the HEATER fuse to FAN NO.3
relay (Coil side) to TERMINAL 13 of the A/C amplifier to TERMINAL 6 to GROUND, turning the FAN NO.3 relay on.
SERVICE HINTS
FRONT HEATER RELAY
1-2 : Closed with the ignition SW at ON position and the blower SW on
A3 A/C DUAL PRESSURE SW
1-4 : Open with the refrigerant pressure at less than approx. 196.1 kpa (2.0 kgf/cm2, 28.4 psi) or more than
approx. 3138.1 kpa (32.0 kgf/cm2, 455 psi)
B4 BLOWER RESISTOR
2-5 : Approx. 0.33
5-1 : Approx. 1.01
1-3 : Approx. 3.21
: PARTS LOCATION
Code See Page Code See Page Code See Page
A2 32 B3 34 J3 B 35
A3 32 B4 34 J7 35
A8 34 B5 34 J8 35
A10 34 E9 B 34 J17 35
A11 34 F8 32 R25 35
A31 34 J2 A 35
2001 SIENNA (EWD420U)
232
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
1 28 Engine Room R/B No.1 (Engine Compartment Left)
4 29 Passenger Side R/B No.4 (Front Side the Blower Motor)
5 29 Driver Side R/B No.5 (Lower Finish Panel)
,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
,,,
,,,
Code See Page Junction Block and Wire Harness (Connector Location)
1R
22 Cowl Wire and Driver Side J/B No.1 (Lower Finish Panel)
No 1
1W
2C 24 Engine Room Main Wire and Engine Room J/B No.2 (Engine Compartment Left)
2K 24 Cowl Wire and Engine Room J/B No.2 (Engine Compartment Left)
3C
26 Cowl Wire and J/B No 3 (Behind the Combination Meter)
No.3
3D
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EB1 40 Cowl Wire and Engine Room Main Wire (Inside the Lower Cover of Engine Room J/B No.2)
IK3
44 Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)
IK7
: GROUND POINTS
Code See Page Ground Points Location
ED 40 Near the Left Front Suspension Support
IJ 42 Right Cowl Side Panel
2001 SIENNA (EWD420U)
233
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