Toyota 4RUNNER 2007 Electrical Wiring Diagram page 366

System Outline
1. Heater Blower Operation
Manual operation
When the blower speed is set to a certain level using the blower control SW, the A/C control assembly sends the signals to
the blower control to control the blower motor speed.
Auto operation
When the auto SW is pushed, the A/C control assembly sends the signals from various sensors and temperature SW to the
blower control to automatically control the blower motor speed.
2. Air Inlet Control Servo Motor Control
When the FRESH/RECIRC select SW is set to RECIRC, the motor in the air inlet control servo motor starts rotating to move
the damper toward the RECIRC side. Since the damper position is detected by the TERMINAL TPI of the A/C control
assembly, the motor is continuously rotated until the damper reaches its stop position. When the FRESH/RECIRC select SW
is set to FRESH, the motor in the air inlet control servo motor starts rotating to move the damper toward the FRESH side.
Since the damper position is detected by the TERMINAL TPI of the A/C control assembly, the motor is continuously rotated
until the damper reaches its stop position.
3. Air Vent Mode Control Servo Motor Control
When the mode select SW is pushed, the ECU in the A/C control assembly activates the air vent mode control servo motor.
This causes the servo motor to rotate to the position (FACE, BI–LEVEL, FOOT, FOOT/DEF, DEF) selected using the mode
select SW, and moves the damper.
4. Air Mix Control Servo Motor Control (Limited)
When the temperature control SW on the driver's side is pressed, the ECU in the A/C control assembly sends a signal to the
air mix control servo motor on the driver's side. This signal drives the motor to reach the temperature set by the temperature
control SW on the driver's side, and moves the damper. Passenger's side is operated as same as the driver's side.
5. Air Mix Control Servo Motor Control (Except Limited)
When the temperature control SW is pressed, the ECU in the A/C control assembly sends a signal to the air mix control
servo motor. This signal drives the motor to reach the temperature set by the temperature control SW, and moves the film
damper.
6. 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 and coolant temperature from the engine control module, 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, turning the MG CLT relay on, so that 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.
: Parts Location
Code See Page
32 (2UZ–FE)
A1 A1
34 (1GR–FE)
32 (2UZ–FE)
A2 A2
34 (1GR–FE)
A16 A 36
A17 B 36
A18 36
A19 36
A20 36
A21 36
A25 36
A26 B 36
A27 A 36
A28 36
A29 36
Code See Page
B2 36
B3 36
C9 B 37
C10 C 37
D3 37
32 (2UZ–FE)
E2 E2
34 (1GR–FE)
E4 A 37
E7 D 37
E8 E 37
33 (2UZ–FE)
J1 J1
35 (1GR–FE)
33 (2UZ–FE)
J3 J3
35 (1GR–FE)
J6 38
4RUNNER (EM03M0U)
Code See Page
J7 38
J8 A 38
J9 B 38
J10 A 38
J11 B 38
J20 38
J24 38
J25 38
J31 A 38
J32 B 38
J37 38
33 (2UZ–FE)
P3 P3
35 (1GR–FE)
33 (2UZ–FE)
S28 S28
35 (1GR–FE)
365