Volvo FM9, FM12, FH12 Schematic

Service Manual

Trucks

Group 37

Electrical Schematic

VN, VHD VERSION2

From Build Date April 2004

PV776-20007110

Foreword

The descriptions and service procedures contained in this manual are based on designs and methods studies carried out up to September 2004.

The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary service bulletins will be issued to cover the changes.

The new edition of this manual will update the changes. In service procedures where the title incorporates an operation number, this is a

reference to an V.S.T. (Volvo Standard Times). Service procedures which do not include an operation number in the title are for general

information and no reference is made to an V.S.T. Each section of this manual contains specific safety information and warnings which

must be reviewed before performing any procedure. If a printed copy of a procedure is made, be sure to also make a printed copy of the safety information and warnings that relate to that procedure. The following levels of observations, cautions and warnings are used in this Service Documentation:

Note: Indicates a situation, handling or circumstance which should be observed. Caution: Indicates a potentially hazardous situation which, if not avoided, may result in

minor or moderate injury or damage to property. Warning: Indicates a potentially hazardous situation which, if not avoided, could result

in death, serious injury or major damage to property. Danger: Indicates an imminently hazardous situation which, if not avoided, will result in

death or serious injury.

Volvo Trucks North America, Inc.

Greensboro, NC USA

Order number: PV776-20007110

All rights reserved. No part of this publication may be reproduced, stored in retrieval system, or transmitted in any forms by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Volvo Trucks North America, Inc..

USA15171

Contents

VN, VHD .................................................................................................. 3

Electrical Schematics ............................................................................... 3

Illustrations ........................................................................................... 77

Illustration Index, Wiring Harnesses ...................................................... 77

Reference ............................................................................................ 149

Reference List: Fuses .......................................................................... 149

Reference List: Relays ......................................................................... 155

Reference List: Components ............................................................... 156

Reference List: Inline Connectors ....................................................... 176

Reference List: Physical Splice Connectors ........................................ 186

Glossary ............................................................................................... 190

Wire Color Codes ................................................................................. 191

Group 37 Electrical Schematic, VN, VHD VN, VHD

VN, VHD

Electrical Schematics

For instructions on using the schematics, see service information on “Wiring Diagram User Guide” in Group 37.

Also see: “Reference List: Fuses” page 149 “Reference List: Components” page 156 “Reference List: Inline Connectors” page 176 “Glossary” page 190 “Wire Color Codes” page 191

Schematic Index

BE BF BG BH BI

BJ BK

Power supply, starting and charging system (1 of 2) Fig. 1: AA page 6 Power supply, starting and charging system (2 of 2) Fig. 2: AB page 7 Grounding (1 of 2) Fig. 3: AC page 8 Grounding (2 of 2) Fig. 4: AD page 9 Vehicle ECU (1 of 2) Fig. 5: BA page 10 Vehicle ECU (2 of 2) Fig. 6: BB page 11 Instrument cluster, Connectors A and B Fig. 7: BC page 12 Instrument cluster, Connector C Fig. 8: BD page 13

Instrumentation, Qualcomm Fig. 9: BE page 14 Instrumentation, Volvo Link Bodybuilder Options, VHD Road Relay Bodybuilder Module Touch Lock Secondary Instrument Cluster

Fig. 10: BF page 15 Fig. 11: BG page 16 Fig. 12: BH page 17 Fig. 13: BI page 18 Fig. 14: BJ page 19 Fig. 15: BK page 20

CA CB CC CE CF CH

CI CO

DB DC

Engine Control Common Engine Interface, D12 Engine Control, ISX and ICON Fuel filter heater Engine brake switches Inside/outside air cleaner, VHD Engine Control, Cummins ISX without ICON Engine Electronics, D12D Transmission ECU, Autoshift II Transmission ECU, Lightning

Fig. 16: CA page 21 Fig. 17: CB page 22 Fig. 18: CC page 23 Fig. 19: CE page 24 Fig. 20: CF page 25 Fig. 21: CH page 26 Fig. 22: CI page 27 Fig. 23: CO page 28 Fig. 24: DB page 29 Fig. 25: DC page 30

Group 37 Electrical Schematic, VN, VHD VN, VHD

DD DE

DF DG

DP EA EB FA FB FC

FE GA

Transmission ECU, Meritor G Transmission ECU, Allison, VHD (1 of 2) Transmission ECU, Allison, VHD (2 of 2) Transmission ECU, Freedomline PTO ABS ECU Suspension ECU 6x2 Air Dryer / Heated Drain Valve Lift Axle, VHD Chassis Air Solenoids, VHD Chassis Air Solenoids, VN Central Tire Inflation system LCM Lighting Control Module (1 of 2) LCM Lighting Control Module (2 of 2) Marker Lights

Fig. 26: DD page 31 Fig. 27: DE page 32 Fig. 28: DF page 33 Fig. 29: DG page 34 Fig. 30: DP page 35 Fig. 31: EA page 36 Fig. 32: EB page 37 Fig. 33: FA page 38 Fig. 34: FB page 39 Fig. 35: FC page 40 Fig. 36: FD page 41 Fig. 37: FE page 42 Fig. 38: GA page 43 Fig. 39: GB page 44

Fig. 40: GC page 45

GD GE

GF GG

GI GP GQ HA HB HC HD

HE HF HG

Driving / Signal Lights Driving / Fog Lights Tail Lights and Alarm Back of Cab Lights, Daycabs Back of Cab Lights, Sleeper cabs Snowplow and Beacon Lights Windshield Wiper/Washer Horn Climate Control Unit

Climate Control Unit, Bunk Shore Power/Inverter Bunk Functions/Refrigerator (VN 430, 630, 670) Bunk Functions/Refrigerator/Sink (VN 780) L3 Sleeper Functions without LECM Sleeper Climate Control without LECM L3

Fig. 41: GD page 46 Fig. 42: GE page 47 Fig. 43: GF page 48 Fig. 44: GG page 49 Fig. 45: GH page 50 Fig. 46: GI page 51 Fig. 47: GP page 52 Fig. 48: GQ page 53 Fig. 49: HA page 54

Fig. 50: HB page 55 Fig. 51: HC page 56 Fig. 52: HD page 57 Fig. 53: HE page 58 Fig. 54: HF page 59 Fig. 55: HG page 60

IB IC ID IE

Interior Courtesy Lights Power Seats Power Windows/Electric Mirrors Power Windows/Mirrors without DCP Door Functions/Internal Lights

Fig. 56: IA page 61 Fig. 57: IB page 62 Fig. 58: IC page 63 Fig. 59: ID page 64 Fig. 60: IE page 65

Group 37 Electrical Schematic, VN, VHD VN, VHD

IF IG JA JB JC KA KB KC MA NA XA

Cigar Lighter/Auxiliary Power (Cab Front) Smoke Detector SRS Airbag VORAD Steering Wheel Module/Marker Interrupt Switches Audio System, 4-speaker Audio System, 6-speaker Audio System, 6-speaker with subwoofer, TV Prep Fig. 68: KC page 73 Trailer Cable Fig. 69: MA page 74 Auxiliary switches Diagnostics

Fig. 61: IF page 66 Fig. 62: IG page 67 Fig. 63: JA page 68 Fig. 64: JB page 69 Fig. 65: JC page 70 Fig. 66: KA page 71 Fig. 67: KB page 72

Fig. 70: NA page 75 Fig. 71: XA page 76