PREVOST X3-45 Multiplex User Manual

1 Introduction
3
Meritor WABCO Maintenance Manual MM-0112 (Revised 07-05)
ABS Indicator Lamp
NOTE: If the ECU senses a tractor ABS fault during normal vehicle operation, the ABS indicator lamp will come on and stay on.
Trailer ABS Indicator Lamp
The trailer ABS indicator lamp on the vehicle dash applies to Trailer ABS only. The lamp is controlled by a signal to the tractor ECU, sent over the
power line (PLC function). When a trailer ABS fault is detected, an ON message is sent; when no fault is detected, the ECU receives an OFF
message. Table A illustrates trailer ABS lamp operation at power-up, or ignition on. Table B depicts lamp responses that occur during operation.
Lamp turn ON and OFF messages do not turn the lamp ON or OFF instantly. The delay between the receipt of the message and the lamp
response time is intentional. It prevents erratic lamp activity.
NOTE: For doubles or triples, the lamp does not distinguish between trailers. A system fault in any of the trailers will activate the trailer ABS
indicator lamp.
Table A: Dash-mounted Trailer ABS Indicator Lamp Operation — Bulb Check (Information for Drivers)
ON = Turn ON message to the “trailer ABS” lamp
OFF = Turn OFF message to the “trailer ABS” lamp
The ABS indicator lamp works as follows:
Ignition ON Normal Operation ABS lamp comes on at ignition
momentarily for a bulb check,
then goes out.
System is OK.
After servicing ABS ABS lamp does not go out at
ignition.
When vehicle is driven at speeds
above 4 mph (6 km/h), lamp
goes out. System is OK.
Off-road ABS operation. Refer
to the off-road ABS information
in this section.
ABS lamp flashes during vehicle
operation.
The vehicle’s normal ABS
function is being modified due to
road conditions.
Existing Fault ABS lamp does not go out at
ignition.
Lamp does not go out at speeds
above 4 mph (6 km/h) — a fault
exists in the ABS system.
Signal from Trailer to Tractor ECU
Status of Trailer ABS Lamp on
Vehicle Dash Explanation
Single or Multiple Trailers Trailer ABS lamp comes on at
ignition, OFF message is detected
within three seconds of ignition,
Trailer ABS lamp goes out.
Bulb Check performed AND Trailer ABS
system is OK. In this case, the lamp is
ON for a Bulb Check only.
Single or Multiple Trailers Trailer ABS lamp does not come on
within three seconds of ignition.
No Bulb Check, trailer added after initial
power-up, system OK. There was no
trailer PLC message for at least three
seconds following ignition ON.
ON
OFF
1002005a
message
lamp on
lamp off
0.5
sec
OFF OFF OFF OFF OFF OFF OFF
4003977a
message
lamp on
lamp off
OFF OFF
0.5
sec
ign on
t > 3 sec
No ON or OFF messages
4003978a

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan