Opel Frontera UBS. Service manual — part 646
8D–14
WIRING SYSTEM
Fuse
Fuses are the most common form of circuit protection
used in vehicle wiring. A fuse is a thin piece of wire or strip
of metal encased in a glass or plastic housing. It is wired
in series with the circuit it protects. When there is an
overload of current in a circuit, such as a short of a ground,
the metal strip is designed to burn out and interrupt the
flow of current. This prevents a surge of high current from
reaching and damaging other components in the circuit.
Determine the cause of the overloaded before replacing
the fuse.
The replacement fuse must have the same amperage
specification as the original fuse.
Never replace a blown fuse with a fuse of a different
amperage specification.
Doing so can result in an electrical fire or other serious
circuit damage. A blown fuse is easily identified as shown
in the figure.
WIRING SYSTEM
8D–15
Fusible Link
The fusible link is primarily used to protect circuits where
high amounts of current flow and where it would not be
practical to use a fuse. For example, the starter circuit.
When a current overload occurs, the fusible link melts
open and interrupts the flow of current so as to prevent
the rest of the wiring harness from burning.
Determine the cause of the overload before replacing the
fusible link. the replacement fusible link must have the
same amperage specification as the original fusible link.
Never replace a blown fusible link with fusible link of a
different amperage specification. Doing so can result in
an electrical fire or other serious circuit damage.
A blown fusible link is easily identified as shown in the
figure.
Normal
Blown
Fusible Link Specifications
Type
Rating
Case Color
Maximum Circuit Current (A)
Connector
30A
Pink
15
Connector
40A
Green
20
Bolted
50A
Red
25
Bolted
60A
Yellow
30
Bolted
80A
Black
40
8D–16
WIRING SYSTEM
Circuit Breaker
The circuit breaker is a protective device designed to
open the circuit when a current load is in excess of rated
breaker capacity. If there is a short or other type of
overload condition in the circuit, the excessive current will
open the circuit between the circuit breaker terminals.
The reset knob (1) pops out when the circuit is open. Push
the reset knob in place to restore the circuit after repairing
it.
Relay
Battery and load location may require that a switch be
placed some distance from either component. This
means a longer wire and a higher voltage drop (1).
The installation of a relay between the battery and the
load reduces the voltage drop (2).
Because the switch controls the relay, amperage through
the switch can be reduced.
Push
LOAD
1
2
LOAD
RELAY
D08RW404
1
WIRING SYSTEM
8D–17
Name/
Color
Rated
voltage/Coil
resistance
Internal circuit
Name/
Color
Rated
voltage/Coil
resistance
Internal circuit
1M
(MR5L)/
Black
12V/
Approx.
80
Ω
Minimum
operating
voltage: 7V
at 77˚F (25˚C)
2M
(MR5)/
Brown
12V/
Approx.
80
Ω
Minimum
operating
voltage: 7V
at 77˚F (25˚C)
1B
(MR5L)/
Grey
1B-1M
(MR5)/
Grey
1M
(MR5)/
Black
(Case),
Blue
(Base)
1M
1T
(MR5)/
Black/
Blue
1M
(MR5B)/
Black
Minimum
operating
voltage: 9V
at 68˚F (20˚C)
12V
Minimum
operating
voltage:
4.3V at 77˚F
(25˚C)
1M
(Horn
relay)
12V/
Minimum
operating
voltage: 8V
at 68˚F (20˚C)
➁
➀
➂
➃
➁
➃
➀
➂
➁
➀
➂
➃
➁
➃
➀
➂
➄
➃
➀
➂
➂
➀
➃
➄
➄
➃
➀
➂
➂
➀
➃
➄
➁
➁
➁
➂
➀
➀
➁
➂
➄
➀
➃
➄
➁
➂
➅
➀
➂
➁
➃
➅
➄
➀
➃
➄
➁
➅
➂
➀
➁
➃
➅ ➂
➁
➀
➂
➃
➂
➃
➀
➁
➂
➀
➁
➃
➁
➃
➀
➂
Relay Specifications and Configurations
* Relay contact shown in the wiring diagram indicates condition before actuation.
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