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AIR CONDITIONING (MANUAL A/C)
FROM POWER SOURCE SYSTEM (SEE PAGE 48)
1
50A 7. 5A
HEATER ECU- B
2
2 4 1B
L- R L- R
I3
L- R
R R- L
2
L- R
J2 B
1
CONNECTOR
B B
JUNCTION
J1 A ,
4 IG1
10A
A. C
C A
L- R
2
2
2
B7 M B6
BLOWER RESISTOR BLOWER
11 IG1
Y- R
L- R
MOTOR
R- L
W- B 1 4 1
O
2 2 2 10 IG1
3 2 L- B
L- B
O
HEATER RELAY
2 3
2 3B 4 3B O
4 I12
1
Y- R
L- R
L- Y
1 5
PRESSURE SW
1 3B
A/C DUAL
R L- B
2
2
A1
6 5 4
W- B
2
A
L- R
B- L
O
A 8
8 3 1
A 1
A B IG+ B
OFF LO M1 M2 HI A12
J1 A A/C AMPLIFIER
JUNCTION AMC AMH S5 TP SG
CONNECTOR B8
BLOWER SW 4 5 11 12 13
GR
W
R
Y
B
W- B
W- B
2 4 6 7 5
W- B
A36
A AIR MIX CONTROL SERVO MOTOR
A J9
JUNCTION
CONNECTOR
EB IF
2002 4RUNNER (EWD471U)
220
FROM POWER SOURCE SYSTEM (SEE PAGE 48)
10A
GAUGE
5 1E 5 1F
B- Y
R- L
9 3D
B- Y
I10
2 3D
B- Y
B- Y
A35
B- Y
AIR INLET A37
B- Y
CONTROL AIR VENT MODE
3 SERVO MOTOR 2 CONTROL SERVO MOTOR
IG+
FRS REC
1 2 4 5 6 7 8 1
B- Y
I10
W- B
G- W
Y- G
R- G
G- B
B- Y
P- B
Y- B
R- L
I14
W- B
W- B
2 6 7 17 18 19 20 21 25
IG+ FRS REC FACE B/L FOOT F/D DEF GND
MGC ECON OUT IN ACT AC2
14 24 22 23 9 10 A12
A/C AMPLIFIER 17 3E
W- G
R- W
R- W
W- R
L- B
L- Y
A/C THERMISTOR
2
25 II4 16 3E
3 9
A14
ACT AC1
W- G
1
W- B
R- W
E14
1 ENGINE CONTROL
MODULE
A2 I16
A/C MAGNETIC
CLUTCH
A
J9
JUNCTION
CONNECTOR
IF
2002 4RUNNER (EWD471U)
221
AIR CONDITIONING (MANUAL A/C)
SYSTEM OUTLINE
1. BLOWER MOTOR OPERATION
With the ignition SW on, current from the GAUGE fuse flows to TERMINAL 5 of the HEATER relay to TERMINAL 3 to
TERMINAL 1 of the blower SW.
Low speed operation
When the blower SW is moved to LO position, the current flows to TERMINAL 1 of the blower SW to TERMINAL 8 to
GROUND, causing the HEATER relay to come on. Then the current from HEATER fuse to TERMINAL 1 of the HEATER
relay to TERMINAL 2 to TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 4 of the blower resistor to
TERMINAL 1 to GROUND, causing the blower motor to rotate. At this time, the current flows against the full resistance of the
blower resistor, so the motor turns slowly at low speed.
Medium speed operation (Operation at speed M1, M2)
When the blower SW is moved to the M1 position, the current flows to TERMINAL 1 of the blower SW to TERMINAL 8 to
GROUND, turning the HEATER relay to on. Then, the same as low speed operation, the current passing through the
TERMINAL 2 of the HEATER relay flows to the TERMINAL 2 of the blower motor to TERMINAL 1 to TERMINAL 4 of the
blower resistor to TERMINAL 3 to TERMINAL 3 of the blower SW to TERMINAL 8 to GROUND. At this time, the blower
resistance of the blower resistor is less than at low speed, so the blower motor rotates at medium low speed.
When the blower SW is moved to M2 position, the current flowing through the blower motor flows from TERMINAL 4 of the
blower resistor to TERMINAL 2 to TERMINAL 2 of the blower SW to TERMINAL 8 to GROUND. At this time, blower
resistance of the blower resistor is less 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 1 of the blower SW to TERMINAL 8 to
GROUND, turning the HEATER relay to on. Then, the same as medium speed operation, the current passing through the
blower motor flows from TERMINAL 6 of the blower SW to TERMINAL 8 to GROUND, causing the blower motor to rotates at
high speed.
2. AIR CONDITIONING OPERATION
When the blower SW is set to on, current from the HEATER fuse flows through the A.C fuse to TERMINAL 1 of the A/C dual
pressure SW to TERMINAL 2 to TERMINAL 3 of the A/C amplifier. The engine speed signal from engine control Module and
the evaporator temp. signal from the A/C thermistor are all supplied to the A/C amplifier. When the A/C SW is turned on, the
A/C SW on signal is sent to activate the A/C amplifier. Current flows from the A/C amplifier to the magnetic clutch, turning the
compressor on. The A/C operation is shut off when a signal indicating low evaporator temp., or abnormally high or low
refrigerant pressure, is supplied while the engine high speed signal exists. When one of these signals is received, the
amplifier shuts off the A/C operation.
SERVICE HINTS
A1 A/C DUAL PRESSURE SW
1-2 : Open with refrigerant pressure at less than approx. 2.0 kgf/cm2 (28.4 psi, 196 kpa) or
more than approx. 32 kgf/cm2 (455 psi, 3138 kpa)
HEATER RELAY
1-2 : Closed with ignition SW at ON position and blower SW on
1-GROUND : Always approx. 12 volts
5-GROUND : Approx. 12 volts with ignition SW at ON position
4-GROUND : Always continuity
B8 BLOWER SW
8-1 : Closed with blower SW at LO position
8-6, 1 : Closed with blower SW at M1 position
8-5, 1 : Closed with blower SW at M2 position
8-4, 1 : Closed with blower SW at HI position
A2 A/C MAGNETIC CLUTCH
1-GROUND : Approx. 3.7
: PARTS LOCATION
Code See Page Code See Page Code See Page
A1 28 A36 30 E14 31
A2 28 A37 30 J1 A 29
A12 30 B6 30 J2 B 29
A14 30 B7 30 J9 31
A35 30 B8 30
2002 4RUNNER (EWD471U)
222
: RELAY BLOCKS
Code See Page Relay Blocks (Relay Block Location)
2 22 Engine Room R/B (Engine Compartment Left)
,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
,,,
,,,
Code See Page Junction Block and Wire Harness (Connector Location)
1B 24 Cowl Wire and Driver Side J/B (Lower Finish Panel)
1E 24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1F 24 Cowl Wire and Driver Side J/B (Lower Finish Panel)
3B
3D 26 Cowl Wire and Center J/B (Near the Steering Column Tube)
( g )
3E
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IG1 38 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
II4 40 Engine Wire and Cowl Wire (On the Glove Box)
: GROUND POINTS
Code See Page Ground Points Location
EB 36 Front Left Fender
IF 38 Cowl Side Panel RH
: SPLICE POINTS
Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
I3 40 Engine Room Main Wire I14
40 Cowl Wire
I10 I16
40 Cowl Wire
I12
2002 4RUNNER (EWD471U)
223
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