Key to wiring diagram 21 o - 410 (Items 7 to 13) Vehicles with closed-loop system catalyst
7 Heater blower
8
9
E 18 Lighting for heater control
M 4 Heater blower motor
S 6 Heater blower switch
Fuel, coolant, backup light
B 3
Sending unit for fuel gauge
B
4
Sending unit for coolant
temperature gauge
E19
Backup light, left
E20
Backup light, right
F 5
Fuse
p
1 Fuel gauge
p
2
Coolant temperature gauge
s
7
Backup light switch
Speedometer, tachograph, clock
p
3
Speedometer
p 4
Clock
p
5
Tachograph
10 Door contact switch, interior
lights, plug socket
E 21,E 22 Lights, cargo space
F 2
Fuse
H12 Interior light
96
S 8, S 9 Door contact switch
S11, S12 Switch, cargo space light
X 4 Plug socket
11 Heated rear window, fuse test
socket
B 5
Switch for heated rear
window
H13
Indicator light for heated
rear window
H14
Indicator light,
fuse test socket
K 4
Relay, heated rear window
R
2
Heated rear window
(cargo truck)
R
3
Heated rear window (van or
X 5
cargo bus)
Fuse test socket
I
Additional fuse
12 Brake fluid, oil pressure,
brake pad wear
F15
Fuse
H15
Indicator light, brake fluid
H16
Indicator light, oil pressure
H17
Indicator light, differential
lock
S13
Switch, brake pad wear, left
S 14
Switch, brake pad wear, right
S15
S16
S17
V 1
X 3
Switch, brake fluid
Switch, oil pressure
Switch, differential lock
Diode
Trailer plug socket
13 Control unit
F 3
Fuse
F 7 Fuse
K 5
Overvoltage protection relay
K
6
Relay, intake pipe heater
K
7
Relay, bypass heater
N 1 Control unit
R
4
Temperature sensor
R 5
Intake pipe heater
R 6
Bypass heater
R
7 Oxygen sensor
R 8
Adjustment plug
X 6
Ground connec tion, engine
X 7
Plug connec tion,.air
conditio ner
y
1
Throttle valve actuator
y
2
Potentiometer, throttle valve
y
3
Choke adjusting motor
y
4 Solenoid valve, float
chamber ventilation
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