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Charging the compressed-air system
394
Checking and replacing a safety fuse
X
Pull the fuse out of the module using the pliers
and carry out a visual inspection.
X
If the fuse wire has melted, replace the blown
fuse with a spare fuse.
X
Switch on consumers and check that they
function correctly.
If the safety fuse blows again, have the electrical
system checked at a qualified specialist work-
shop.
Checking and switching on an auto-
matic circuit-breaker
Automatic circuit-breaker
If an automatic circuit-breaker is tripped, pin ?
moves to OFF position 2.
X
Pull the automatic circuit-breaker out of the
module.
X
Press pin ? into ON position 1.
X
Press trip switch =.
If pin ? moves to OFF position 2, the auto-
matic circuit-breaker is functioning correctly.
If pin ? does not move to OFF position 2,
replace the automatic circuit-breaker.
X
Press pin ? into ON position 1 and refit the
circuit-breaker.
X
Switch on consumers and check that they
function correctly.
If the automatic circuit-breaker is tripped again,
have the electrical system checked at a qualified
specialist workshop.
Charging the compressed-air system
If the supply pressure of the external
!
compressed-air source is under 11 bar it can-
not be guaranteed that you will be able to fill
all the pressure circuits.
Bear in mind that the compressed air does not
pass through the compressed-air drier if you
fill the compressed-air system via:
connection 28 on the electronic air pro-
R
cessing unit
the connections on the brake power sensor
R
beneath the maintenance flap
For this reason, the air from the external
compressed-air source must be clean and
dry.
Fill the pressure circuits up to a maximum
pressure of 12.5 bar. Otherwise,
compressed-air system components could be
damaged.
Filler connections on the brake power sensor
When the engine is not running, fill the
compressed-air system via filler connections :
at the front of the brake power sensor. This does
not fill the pressure circuit of the air suspension.
Example: connection 28 on the electronic air pro-
cessing unit
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