Available Test Modes; Multiplex Input Test - PREVOST H3-41 Maintenance Manual

4.

AVAILABLE TEST MODES

The available test modes are the followings:
1. MUX (multiplex) Input test;
2. Electric motors test sequence;
3. Alternator test.
4.1

MULTIPLEX INPUT TEST

The multiplex input
information to diagnose multiplexed input of
switches and sensors, complimentary to the
electrical system diagnosis.
To initiate the test, use the Driver Information
Display (DID) DIAGNOSTICS menu. Select
VEHICLE TESTS submenu and then START
MUX INPUT TEST. Press ENTER button to start
the test. The DID status line will show TEST to
confirm the test mode is active. To exit test,
press ESCAPE button, select TERMINATE
TESTS & FORCED STATES submenu and then
press ENTER button twice. TEST will disappear
from the DID status line.
Instrument 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 beep
that allows verification of the sensors at the rear
of the vehicle.
Certain inputs are doubled (for example, turn
signal switch on multi-function lever, door
operating buttons) and also other inputs activate
at the same time (ex. kneeling switch and
Kneeling proximity sensor switch). For these
inputs, 2 beeps are emitted. If only one beep is
heard, one of the inputs is defective.
test provides useful
PA1621 Maintenance Manual All Series | Revised Sept 2019
SECTION 06: ELECTRICAL
SWITCHES AND SENSORS SUPPORTED
BY THE SWITCH/SENSOR TEST MODE
HVAC control unit driver's section ON/OFF
HVAC control unit driver recirculate switch
HVAC overhead compartment fan switch
HVAC control unit
ON/OFF
Engine rear start selector switch "rear start"
Engine rear start selector switch "normal"
Engine ignition front switch
Engine ignition rear switch
Entrance door inside opening /closing switch
Entrance door outside opening /closing switch
Electric horn button
Kneeling down switch
Kneeling up switch
Baggage compartment locking system switch
Baggage compartment door ajar open sensor
Steering wheel control buttons
Lavatory emergency switch
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
Headlamps switch, 2 positions
Multi-function lever headlamps beam toggle
switch
Baggage compartment door lock/unlock switch
Tag axle lever
Wheelchair lift activation switch
Windshield lower wiper
Multi-function lever windshield wipers intermit.
Lower windshield wipers backup switch
Lower windshield washer switch
Upper windshield washer switch
passenger's section
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