SECTION 06: ELECTRICAL
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version) – Sec 06 revised June 2017
35
Problem/symptom
Probable causes
Actions
The radiator fan clutch
does not function and the
engine is overheating
3. Set the ignition switch to the on
position.
4. Activate the dashboard telltale light
test switch 3 times within 4 seconds.
5. In the engine compartment, set the
starter selector switch to rear start
and then start the engine from the
rear.
While in this mode, the rear start push-
button can be used to manually engage
the fan clutch. The multiplex system
knows when the engine is already
running, and it will not activate the starter.
6. Press the push-button one time to
engage the clutch in 1
st
speed, press
a second time to engage in 2
nd
speed, press a third time to stop the
fan, press once again to return to 1
st
speed.
If the fan clutch does not engage using
this procedure then the clutch is faulty or
the wiring between the multiplex module
and the clutch is faulty. Mechanically lock
the fan clutch as described in section 05:
COOLING SYSTEM
of the maintenance
manual.
4.9 MULTIPLEX
ERROR
MESSAGES
TROUBLESHOOTING LIST
Multiplex error messages that can be displayed
on driver information display (DID) are
alphabetically listed in section 06b at the end of
section 06 along with fmi description, fault
condition, possible symptoms and possible
causes.
4.10 MULTIPLEX MODULE “NO RESPONSE”
TROUBLESHOOTING LIST
Multiplex module “no response” messages that
can be displayed on driver information display
(DID) are listed in section 06c at the end of
section 06 along with fmi description, fault
condition, possible symptoms and possible
causes.
4.11 ESSENTIAL
FUNCTIONS TO OPERATE
THE VEHICLE
Even with a defective mcm (master chassis
module) or a can network problem, essential
base functions are maintained to rear start the
vehicle from the engine compartment and drive
in a secure manner.
However, many secondary functions are lost. In
this case, the following directives must be
followed.
o
Never connect a battery charger when the
ignition is at the on position on a vehicle with
a can defective or certain functions will start
up by themselves,
o
Disconnect the charger before starting the
vehicle, if not the default functions will not
activate,
o
If the default mode does not activate, try to
turn the ignition off while ensuring that no
