11
Fan control
The control unit for radiator fan V293 regulates
the output of the radiator fan and controls the
continued coolant circulation. The induced-air
fan V7 and the forced-air fan V177 are
activated simultaneously.
Forced-air fan V177 is located upstream of the
condenser, water cooler and visco fan. It
assists the visco fan.
The electronic power control
The various fan settings are executed by an
electronic power control.
The fan motors are operated periodically, the
length of the operating cycle depending on the
fan setting selected. Fan output level is
controlled via pulse-width-modulated outputs.
Should a fan fail, the radiator fan control unit
increases the speed of the fan motor still
available.
Advantages of the power control:
•
The series resistors previously used for
power control are no longer required.
•
Lower power consumption in lower fan
settings.
•
Safety functions.
The power supply is protected by a
fuse on the 8-socket relay plate. For
the correct fuse rating, please refer
to wiring diagram.
Vehicles equipped with an air
conditioner require a higher fuse
rating than vehicles without an air
conditioner.
SSP 198/50
8-socket relay plate
SSP 198/55
Control unit for radiator fan
attached to front right
vehicle side member
Fuse, terminal 30
Fuse, terminal 61
63
M
30
15
31
31 31
30
15
31
_
G6N31
N32N33N80
J220
N83N84
N30
N75
N249
N205
N208
SSP 198/18
G235
G236
G31
N N128J17
N158 N163 N164 N189
Q PPPPPP
QQ QQQ
A
A
B Z
ZB
B
B
N122
A
B
B
B
1
N192
G61
G66 G188 G187 G186 G79
F47 F36 FG163 G40 G62G2 G42
K132 G185
G28 G70 G39
Z19G108
Z28
Y
+
Y
I
2
3
4
5
6
7
8
9
10
11
12
II
l
l
t° t°
m
lt° t° t°
+++ +
Cruise control op. switch
from ignition lock terminal 15
to the brake lightsterminal 30a
Body earth
Engine earth
Note:
For the correct fuse rating,
please refer to the current flow
diagram
Body earth