1998 TOYOTA LAND CRUISER Factory Repair Manual

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Page 2369 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
362Air Conditioning (Front)
1. Heater Blower Operation
Manual operation
When the blower speed is set ant any speed by the blower control SW, the A/C control assembly sends

2004 LAND CRUISER (EWD548U)
362Air Conditioning (Front)
1. Heater Blower Operation
Manual operation
When the blower speed is set ant any speed by the blower control SW, the A/C control assembly sends a signal to the
blower motor controller, and controls the blower motor speed.
Auto operation
When the auto SW is operated, the A/C control assembly sends signals to the blower motor controller, according to the
signals from respective sensors, commands from the temperature SW etc., and controls the blower motor automatically.
2. Air Inlet Control Servo Motor Control
When the FRESH/RECIRC select SW is switched to RECIRC, the motor in the air inlet control servo motor rotates to move
the damper to the RECIRC side. The damper position is recognized by the A/C control assembly TERMINAL TPI, and
rotates the motor until the damper reaches its position.
When the FRESH/RECIRC select SW is switched to FRESH, the motor in the air inlet control servo motor rotates to move
the damper to the FRESH side. The damper position is recognized by the A/C control assembly TERMINAL TPI, and rotates
the motor until the damper reaches its position.
When the FRESH/RECIRC select SW is set to auto, the exhaust gas sensor in the engine room detects the ingredient of the
exhaust emission, and switches the FRESH/RECIRC mode automatically.
3. Air Vent Mode Control Servo Motor
When the mode select SW in the A/C control assembly is pushed, a signal is sent from the A/C control assembly, and
activates the air vent mode control servo motor. This causes the servo motor to rotate to the position selected using the
mode select SW (FACE, BI-LEVEL, FOOT, FOOT/DEF, DEF), and moves the damper.
4. Air Mix Control Servo Motor
When the temperature control SW in the A/C control assembly is pushed, a signal is sent from the A/C control assembly, and
activates the air mix control servo motor. The motor and damper is moved until it reaches the temperature set by the
temperature control SW.
5. Air Conditioning Operation
The A/C control assembly receives various signals, i. e., the engine RPM from the crankshaft position sensor, outlet
temperature from the A/C ambient temp. sensor, coolant temperature from the engine coolant temp. sensor, and the lock
signal from the A/C compressor, etc. When the engine is started and the A/C SW is turned on, a signal is sent to the A/C
control assembly. As a result, the magnetic clutch is turned on and operates the compressor.
In addition, when the engine control module detects that the magnetic clutch is on and the A/C compressor is operating, it
controls the engine in the direction to avoid lowering the engine RPM during A/C operation.
When any of the following signals are sent to the A/C control assembly, the A/C is turned off.
*Coolant temp. is high.
*Outlet air temp. is low.
*Large difference between the engine speed and compressor speed.
*The refrigerant pressure is abnormally high or low.
A45 (A), A47 (C) A/C Control Assembly
(C)11-Ground : Always approx. 12 volts
(C)22-Ground : Approx. 12 volts with ignition SW at ON or ST position
(A)27-Ground : Approx. 12 volts with ignition SW at ON or ST position (w/o navigation system)
(C) 12, (C) 14, (C) 15, (C) 17, (C) 18-Ground : Always continuity
C28 Center Cluster Integration Panel (w/ Navigation System)
2-Ground : Approx. 12 volts with ignition SW at ON or ST position
16-Ground : Always continuity
System Outline
Service Hints

Page 2370 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
363
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A168A45A70F1868
A468A46B70G470
A568A47C70J1171
A1870B170J23B72
A1970B970J25A72
A2470C2870M6A71
A2570E7C70M9B71

Page 2371 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
364Air Conditioning (Front)
:Ground Points
CodeSee PageGround Points Location
EA76Front Right Side of Fender Apron
EC76Rear Bank of Right Cylinder Head
IF78Set Bolt of Cowl

Page 2372 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
365 Memo

Page 2373 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
366Air Conditioning (Rear)
A45(
A)
, A46(
B)
, A47(
C)
C 12GND
IF A AVER2
17 C
AVER4
15 C
AVER5
14 C
A
W- B
W- B
W- B
W- B
J11
2D 2
W- B W- B
A 40RRMGV
IV4 22
LG- R LG- R
B

Page 2374 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
367
C 18VER1
4F 10
4C 2
IV4 18
W- B W- B
IV4 19 IV415 IV416 IV417 B 10FRCID
B 1FRCLK
B 2 FRCSD
(
Shielded)
B
W
R
10A
ECU- B2 From Power Source System (
See Page 94)
3Q 71 3

Page 2375 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
368Air Conditioning (Rear)
3KA 14HRRH
18
3B 10
1B 71 1B52
50 1B 10A
RR
HTR From Power Source System
(
See Page 94)
L- B L- B
F
L
IA2 18
2 1
L- B
L- W
W- B
R
W
B
W- B
LG- R

Page 2376 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
369
A 18CID CLK
20 A CSD
19 A A 22GND +B
1A
BW1 6A 4BLWC
23
14
BW1 8
W- B W- BR R
BW1 5A 3VMC
W- L W- L
R16
BW1 10A 13HRRC
R- Y R- Y
23 41
2 1
L
R- L
B19
R14
R17
30A
RR A/C

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