PREVOST LE MIRAGE XLII BUS SHELLS Maintenance Manual Download

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Section 06: ELECTRICAL

PA1564

The telltale panel module and HVAC module are
linked to the CECM by a CAN connection. In
case of a CAN connection default, the telltale
panel LCD display shows "CAN", and on the
HVAC control unit, the temperature display
indicates "---". To confirm a CAN connection
default, check that the fan speed on the driver's
section HVAC control unit cannot be adjusted.

Moreover, specific error messages from these 2
modules can be read in the ELECTRICAL
SYSTEM menu.

NOTE

While downloading a new vehicle program in the
CECM from a computer, the CAN network is
temporarily interrupted and therefore a CAN
reference appears in the telltale panel LCD
display.

4.3.2 Spare Can
A spare CAN network is installed between the
front and the rear of the vehicle. It has
connectors installed at each end to facilitate
swapping from the regular CAN network to the
spare CAN network. Refer to the vehicle wiring
diagram and paragraph 4.6 for more information.

4.4 TEST MODE FOR SWITCHES AND

SENSORS

The switch/sensor test mode provides useful
information to diagnose problems complimentary
to the electrical system diagnosis.

To enter this mode, activate the dashboard
"Telltale Light Test" switch 3 times within 4
seconds. To exit the switch/sensor test mode,
reactivate the test switch 1 time or turn OFF the
ignition.

4.4.1 Information Available And Impact On

The Functions In Switch/Sensor Test
Mode

Telltale panel audible alarm emits a

beep

each

time an OFF/ON transition is detected on a
multiplex input. This allows quick verifying if the
switches and sensors are detected or seen by
the multiplex modules. When the vehicle is
parked, the back-up alarm also emits a sound
that allows verification of the sensors at the rear
of the vehicle.

Certain inputs are doubled (ex. turn signal switch
on multi-function lever) and also other inputs
activate at the same time. For these inputs, 2

beeps

are emitted. If only one

beep

is heard, one

of the inputs is defective.

SWITCHES AND SENSORS SUPPORTED
BY THE SWITCH/SENSOR TEST MODE

HVAC control unit driver’s section ON/OFF
A/C door ajar open sensor
HVAC control unit driver recirculate switch
HVAC control unit cabin area ON/OFF
Engine ether start switch
Radiator fan clutch switch
Engine front start enable switch
Engine rear start enable switch
Engine ignition front switch
Engine ignition rear switch
Entrance door electric window down switch
Entrance door electric window up switch
Electric horn button
Interior lighting switch, 2 positions
Driver’s area lighting switch
Reading lights switch
Multi-function lever LH turn signal
Multi-function lever RH turn signal
Fog lights switch
Hazard warning flashers switch
Multi-function lever courtesy blinkers switch
Headlights switch, 2 positions
Multi-function lever headlights beam toggle
switch
Baggage compartment door lock/unlock switch
Tag axle signal
Windshield lower wiper
Multi-function lever windshield wipers intermit.
Multi-function lever windshield wipers speed
1,2
Lower windshield wipers backup switch
Lower windshield washer switch

The following inputs, either certain options or
sensors which are difficult to activate, are not
supported by the switch/sensor test:

Starter

Sensor;

ABS Warning input;

Driver's Power Window Switch (up & down);

Fog Lights Switch;

Alternator Sensors 1 & 2;

Retarder Active Signal;

Radiator fan speed 1 & 2 signals.

When in switch/sensor test mode, the A/C
compressor HI and LO pressure values are
displayed one after the other instead of the
outside temperature in the telltale panel LCD
display. This feature can be used when the

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