2000 TOYOTA CAMRY Service Repair Manual

windshield wipers tire pressure reset oil pressure headlight bulb fuel cap release mileage

Page 1441 of 4770

TOYOTA CAMRY 2000 Service Repair Manual AIR CONDITIONING (AUTOMATIC A/C)
A/C CONTROL A SS EMBLY
1 2
M3 4 1 2
B±YL P G± R
A/C SOLAR SENSOR A37
AIR MIX CONTROL SERVO MOTOR A39
WARM COOL
A/C ROOM TEMP. SENSOR
A/C EVAPORATOR TEMP. SENSORA36

Page 1442 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 1. HEATER BLOWER MOTOR OPERATION
Current is applied at all times through HTR fuse to TERMINAL 1 of the HTR relay. When the ignition SW is turned on,
current flows through the HEATER fuse to TERMINAL 5

1. HEATER BLOWER MOTOR OPERATION
Current is applied at all times through HTR fuse to TERMINAL 1 of the HTR relay. When the ignition SW is turned on,
current flows through the HEATER fuse to TERMINAL 5 of the HTR relay to TERMINAL 3 to TERMINAL HR of the A/C
control assembly. At the same time, current also flows from HEATER fuse to TERMINAL IG+ of the A/C control assembly.
*Low speed operation
When the blower SW (A/C control assembly) is pushed to LOW SPEED position, the current to TERMINAL HR of the
A/C control assembly flows to TERMINAL GND of the A/C control assembly to GROUND and turns the HTR relay on.
As a result, the current to TERMINAL 1 of the HTR relay flows to TERMINAL 2 of the relay to TERMINAL 2 of the
blower motor to TERMINAL 1 to TERMINAL 2 of the blower resistor to TERMINAL 6 to GROUND and causes the
blower motor to rotate at low speed.
*High speed operation
When the blower SW (A/C control assembly) is pushed to HIGH SPEED position, the current to TERMINAL HR of the
A/C control assembly flows to TERMINAL GND of the A/C control assembly to GROUND and turns the HTR relay on.
As a result, the current to TERMINAL 1 of the HTR relay flows to TERMINAL 2 to TERMINAL 2 of the blower motor to
TERMINAL 1 to TERMINAL 4 of the A/C blower motor linear controller to TERMINAL 2 to TERMINAL BLW of the A/C
control assembly (Which is activated when the blower SW is pushed to high speed position) to TERMINAL GND to
GROUND without passing through the blower resistor, causing the blower motor to rotate at high speed.
2. AIR INLET CONTROL SERVO MOTOR OPERATION
(Switching from FRESH to RECIRC)
With the ignition SW turned on, the current flows from HEATER fuse to TERMINAL IG+ of the A/C control assembly to
TERMINAL AIR to TERMINAL 7 of the air inlet control servo motor to TERMINAL 6 to TERMINAL AIF of the A/C control
assembly to TERMINAL GND to GROUND, the motor rotates and the damper moves to the RECIRC side. when the
damper operates with the A/C SW at RECIRC position, the damper position signal is input from TERMINAL 5 of the servo
motor to TERMINAL TPI of the A/C control assembly. As a result, current to the servo motor circuit is cut off by the A/C
control assembly, so the damper stops at that position.
(Switching from RECIRC to FRESH)
With the ignition SW turned on, when the RECIRC/FRESH SW is switched to the FRESH side, the current flows from
TERMINAL IG+ of the A/C control assembly to TERMINAL AIF to TERMINAL 6 of the air inlet control servo motor to
TERMINAL 7 to TERMINAL AIR of the A/C control assembly to TERMINAL GND to GROUND, The motor rotates and the
damper stops at that position.
3. AIR VENT MODE CONTROL SERVO MOTOR OPERATION
When the ignition SW turned on, the current flows from HEATER fuse to TERMINAL IG+ of the A/C control assembly.
(Switching from DEF to FACE)
The current flows from TERMINAL FACE of the A/C control assembly to TERMINAL 1 of the air vent mode control servo
motor to TERMINAL 5 to TERMINAL DEF of the A/C control assembly to TERMINAL GND to GROUND. The motor rotates
and the damper moves to the FACE side. When the damper operates with the A/C SW at FACE position, the damper
position signal is input from TERMINAL 5 of the servo motor to the TERMINAL DEF of the A/C control assembly. As a
result, current to the servo motor circuit is cut off by the A/C control assembly, so the damper stops at that position.
(Switching from FACE to DEF)
The current flows from TERMINAL DEF of the A/C control assembly to TERMINAL 5 of the air vent control servo motor to
TERMINAL 1 to TERMINAL FACE of the A/C control assembly to TERMINAL GND to GROUND, the motor rotates and the
damper stops at that position.
4. AIR MIX CONTROL SERVO MOTOR OPERATION
When the temperature control SW (A/C control assembly) is turned to the ºCOOLº side the current flows from TERMINAL
AMC of the A/C control assembly to TERMINAL 1 of the air mix control servo motor to motor to TERMINAL 2 to
TERMINAL AMH of the A/C control assembly to GROUND and the motor rotates. The damper opening angle at this time
is input from TERMINAL 3 of the servo motor to TERMINAL TP of the A/C control assembly, this is used to determine the
DAMPER STOP position and maintain the set temperature.
When the temperature control SW (A/C control assembly) is turned to the ºHOTº side, the current flows from servo motor
to TERMINAL AMH of the A/C control assembly to TERMINAL 2 of the air mix control servo motor to motor to TERMINAL
1 to TERMINAL AMC of the A/C control assembly, rotating the motor in reverse and switching the damper from ºCOOLº to
ºHOTº side.
SYSTEM OUTLINE

Page 1443 of 4770

TOYOTA CAMRY 2000 Service Repair Manual AIR CONDITIONING (AUTOMATIC A/C)
5. AIR CONDITIONING OPERATION
The A/C control assembly receives various signals, I.E., the engine RPM from the engine control module, out side air
temperature signal f

AIR CONDITIONING (AUTOMATIC A/C)
5. AIR CONDITIONING OPERATION
The A/C control assembly receives various signals, I.E., the engine RPM from the engine control module, out side air
temperature signal from the A/C ambient temp. sensor, coolant temperature from the engine control module and the lock
signal from the A/C compressor, etc.
When the engine is started and the A/C SW (A/C control assembly) is on, a signal is input to the A/C control assembly.
As a result, the ground circuit in A/C control assembly is closed and current flows from HEATER fuse to TERMINAL 1 of
the MG CLT relay to TERMINAL 2 to TERMINAL 3 of the diode (A/C) to TERMINAL 2 to TERMINAL MGCR of the A/C
control assembly to TERMINAL GND to GROUND, turning the MG CLT relay on, so that the magnetic clutch is on and the
A/C compressor operates.
At the same time, the engine control module. Detects the magnetic clutch is on and the A/C compressor operates.
If the A/C control assembly detects the following conditions, it stops the air conditioning:
*Evaporator outlet air is too low.
*There is a marked difference between the compressor speed and the engine speed.
*The refrigerant pressure is abnormally high or abnormally low.
*The engine speed is too low.
*Rapid acceleration occurs.
A3 A/C DUAL PRESSURE SW
4±1 : Open above approx. 2.0 kgf/cm2 (29 psi, 196 kpa) or 32 kgf/cm2 (464 psi, 3138 kpa)
A2
A/C MAGNETIC CLUTCH AND LOCK SENSOR
4±GROUND : Approx. 3.7 W
A34 (A), A35 (B) A/C CONTROL ASSEMBLY
B±GROUND : Always approx. 12 volts
IG+ ±GROUND : Approx. 12 volts with the ignition SW at ON position
HR ±GROUND : Approx. 12 volts with the ignition SW at ON position and do not turn the blower motor
Below 1 volts with the ignition SW at ON position and turn the blower motor
PSW±GROUND : Below 1 volts with the ignition SW at ON position
AC1±GROUND : Below 1 volts at start the engine, operate the compressor
+ OR MORE volts at start the engine, do not operate the compressor
BLW±GROUND : Below 1.5 volts with the ignition SW on and turn the blower motor
S5±SG :4±6 volts with the ignition SW at ON position
SG±GROUND : Always continuity
AMH±AMC :1.3±1.9 volts with the ignition SW off
AIF±GROUND : Approx. 12 volts with the FRESH SW on
AIR±GROUND : Approx. 12 volts with the RECIRC SW on
FACE±GROUND: Approx. 12 volts with the FACE SW on
DEF±GROUND : Approx. 12 volts with the DEF SW on
GND±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A226 (1MZ±FE)A3630F826 (1MZ±FE)
A326 (1MZ±FE)A3730J131
A1330A3830J1131
A2030A3930J27A31
A3026 (1MZ±FE)B330J28B31
A3330B830J2931
A34A30D330J3231
A35B30E830
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
124Engine Room R/B No.1 (Engine Compartment Left)
SERVICE HINTS

Page 1444 of 4770

TOYOTA CAMRY 2000 Service Repair Manual �� : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1R
1V20Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1W
()
2C22Engine R

Page 1445 of 4770

TOYOTA CAMRY 2000 Service Repair Manual AIR CONDITIONING (AUTOMATIC A/C)
XXX
13 14 X X
X X
X
25 X X
X
X
X
27
1AA
AAAA
AAAA

FF

FFFF A A
AA

DDGRAY
E8 F8 J1 J11
J27 (A)

Page 1446 of 4770

TOYOTA CAMRY 2000 Service Repair Manual MEMO

Page 1447 of 4770

TOYOTA CAMRY 2000 Service Repair Manual AIR CONDITIONING (MANUAL A/C)
1 1
11 1
1261
3584
IG EB215
4
23
1 HI M2 M11W 2
I 3L±B
B±W
L±B
B±WL±W W± B
W±BL±R W± B
L±W
10A
HEATER
1
HTR
RELAY
BLOWER RESISTOR
BLOWER
MOTOR
B±W
L±B
L±O
BL

Page 1448 of 4770

TOYOTA CAMRY 2000 Service Repair Manual M
CONTROL
CIRCUIT
AIR VENT MODE CONTROL SERVO MOTOR A20* 2 : 5S±FE * 1 : 1MZ±FE
IK27 4 5 6 7 8 1 2 3
DD3
12345
25 1
6
7D2
A/C SW A14 DIODE
(
A/C) D 3
JUNCTION
CONNECTOR J12 L±B
B±W
L±Y(
*2)
L±W

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