PREVOST H3-41 Maintenance Manual page 165

CONTENTS
SECTION CHANGE LOG ........................................................................................................................................... 5
1. TORQUE TABLES ............................................................................................................................................. 6
1.1 ALTERNATORS AND SURROUNDING COMPONENTS ..................................................................................... 6
1.2 ELECTRICAL CONNECTIONS - BATTERIES, MISCELLANEOUS ......................................................................... 9
2. GENERAL DESCRIPTION ................................................................................................................................ 15
2.1 WIRING DIAGRAMS...................................................................................................................................... 15
2.1.1 Using Wiring Diagrams ........................................................................................................................ 15
2.2 TESTING CIRCUITS ........................................................................................................................................ 16
2.3 WIRE SIZES AND COLORS ............................................................................................................................. 16
2.4 WIRE IDENTIFICATION ................................................................................................................................. 16
2.5 SPARE WIRES ............................................................................................................................................... 18
2.6 CIRCUIT BREAKERS ....................................................................................................................................... 18
2.6.1 Main Circuit Breakers On Coaches ....................................................................................................... 18
2.6.2 Main Circuit Breakers On VIP Motorhomes ......................................................................................... 18
2.6.3 VECR/VECF Circuit Breakers ................................................................................................................. 19
2.6.4 Electric Cooling Fan Circuit Breakers .................................................................................................... 19
2.7 MULTIPLEX FUSES ........................................................................................................................................ 19
2.8 RELAYS ......................................................................................................................................................... 19
2.9 COOLING FAN CONNECTIONS ...................................................................................................................... 20
2.10 ELECTRONIC GROUND ................................................................................................................................. 20
2.11 PRECAUTIONS .............................................................................................................................................. 21
2.12 CORROSION INHIBITOR ................................................................................................................................ 21
3. ELECTRONIC MODULES ................................................................................................................................ 21
3.1 MCM ............................................................................................................................................................ 21
3.1.1 Replacing the MCM.............................................................................................................................. 21
3.1.2 Uploading a multiplex program update into the MCM ....................................................................... 22
3.2 I/O-EA AND I/O-EB MODULES ...................................................................................................................... 22
3.2.1 Replacing I/O-EA or I/O-EB Modules .................................................................................................... 22
3.3 ELECTRONIC MODULES CONNECTOR PIN-OUT ........................................................................................... 23
4. AVAILABLE TEST MODES .............................................................................................................................. 27
4.1 MULTIPLEX INPUT TEST ............................................................................................................................... 27
4.2 ELECTRIC MOTOR TEST SEQUENCE .............................................................................................................. 28
4.2.1 Test Sequence - Coaches only .............................................................................................................. 29
4.2.2 Test Sequence - VIP With Central HVAC System .................................................................................. 30
4.2.3 Test Sequence - VIP With Small HVAC System .................................................................................... 31
4.3 ALTERNATOR TEST ....................................................................................................................................... 32
5. LIMP-HOME MODES ..................................................................................................................................... 32
5.1 DRIVER INFORMATION DISPLAY LIMP-HOME MODE .................................................................................. 32
5.2 LOWER PRIORITY I/O-EA & I/O-EB MODULES FOR BREAKDOWN SERVICE ................................................. 32
5.3 FORCED ACTIVATION OF THE COOLING FANS ............................................................................................. 32
5.4 ESSENTIAL FUNCTIONS TO OPERATE THE VEHICLE ..................................................................................... 33
5.4.1 Available Functions .............................................................................................................................. 33
6. NETWORKS .................................................................................................................................................. 33
6.1 DL0 (BBUS MUX) NETWORK ........................................................................................................................ 33
6.2 DL0 (BBUS MUX) CONNECTION ON THE TELLTALE PANEL AND THE HVAC CONTROL UNIT ....................... 34
SECTION 06 : ELECTRICAL
PA1621 Maintenance Manual All Series | Revised Sept 2019 1