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15-38
Relay box
A/C
compressorHFM (intake air
temperature)Cooling fan
module
MB 5 A/T (ATF
temperature)Coolant
temperature
sensor
(12) Cooling fan control
A. Overview of cooling fan and A/C compressor
The cooling system maintains the engine temperature at an efficient level during all engine operating
conditions. The water pump draws the coolant from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant
reaches the operating temperature of the thermostat, the thermostat opens. The coolant then goes
back to the radiator where it cools. The heat from automatic transmission is also cooled down through
the radiator by circulating the oil through the oil pump. ECU controls the electric cooling fans with three
cooling fan relays to improve the engine torque and air conditioning performance.
For detailed information, refer to Chapter "Air Conditioning System".
B. Components
D20DTR ECU
Refrigerant
Page 416 of 796
01-38410-02
1. CAUTIONS WHEN WORKING ON ELECTRICAL UNITS
80℃
10A 15A
Disconnect the negative cable from the
battery in advance when working on electrical
units. -
Make sure to turn "OFF" the ignition switch
and other lamp switches before
disconnecting or connecting the negative
battery cable. (Otherwise, semiconductor
parts can be damaged.)
Do not drop or appy excessive impact to
sensors and relays. -
If a fuse is blown, replace it with a fuse which
has the correct amperage rating. If you use a
fuse with higher capacity than the
specification, the component can be
damaged or catch fire. -
Page 436 of 796
02-58710-01
The remote engine control function has been deleted in this model.
1. COMPONENTS
STICS / ICM module
Air bag ECU
Sends the vehicle collision
signals to STICS.
Theft deterrent horn
Installed under the battery.
This horn works only for the
theft deterrent function, panic
function, and remote starting.
SCAN-tool
SIW is used for REKES key
coding and trouble
diagnosis.
REKES
Added the escort and panic
function
RK STICS
ICM module
This module contains
various relays, chime and
buzzer controlled by STICS
Page 516 of 796
08-4
ICM box
The wiper related relays are installed in
ICM box.
Relay5
(Wiper INT-Low)Relay6
(Wiper High)
STICS
The rain sensing unit detects the amount of rain drops and sends the
operating signal to STICS, and STICS drives the wiper directly.
At this moment, STICS determines the wiper operation mode
(washer, MIST, AUTO), then sends the information to the rain
sensor.