
Service Manual
Trucks
Group 37
Release 01
Wiring diagram
FM9, FM12, FH12, FH16, NH12 VERSION2
FM, FH CHID A 591628-
FM, FH CHID B 381169-
20 014938

Foreword
The descriptions and service procedures contained in this manual are based on designs
and methods studies carried out up to September 04.
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 judged 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 V.S.T. (Volvo Standard Times).
Service procedures which do not include an operation number in the title are for general
information and no referenceis made to V.S.T.
The following levels of observations, cautions and warnings are used in this Service
Documentation:
Note: Indicates a procedure, practice, or condition that must be followed in order to have
the vehicle or component function in the manner intended.
Caution: Indicates an unsafe practice where damage to the product could occur.
Warning: Indicates an unsafe practice where personal injury or severe damage to the
product could occur.
Danger: Indicates an unsafe practice where serious personal injury or death could occur.
Volvo Truck Corporation
Göteborg, Sweden
Order number: 20 014938
© 04 Volvo Truck Corporation, Göteborg, Sweden
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 Truck Corporation.
ENG15719

Contents
Example of wiring diagram ................................................................... 2
Component wiring diagram index ........................................................ 5
Component wiring diagrams ................................................................ 8
Illustrations index ................................................................................ 88
Illustrations ........................................................................................... 89
Fuses ................................................................................................... 167
Relays ................................................................................................. 169
Wiring harness illustration index ..................................................... 171
Earth connections ............................................................................. 174
List of earth connections .................................................................... 176
List of connectors .............................................................................. 177
List of components ............................................................................ 185
Abbreviations ..................................................................................... 191
Cable colour code .............................................................................. 193
Feedback
1

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Example of wiring diagram
Example of wiring diagram
Component wiring diagram title, variant/subtitle and
symbol.
Coordinates (B 1).
30 Voltage battery, kl.30.
15 Voltage with starter key in drive position, kl.15.
DR Voltage with starter key in drive position, preheat
position and start position, kl.DR.
61 Voltage when alternator charges, kl.61.
Splice.
Fuse.
Reference arrow, for diagram BA, coordinates 0 C,
component A17, connector PA pin 29.
2

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Example of wiring diagram
The maximum of variants are drawn, think about that all
wires and components are not standard for all markets or
vehicle models.
Switch.
Relay.
Conductor on circuit card.
Connector MB terminal 9.
Wire area and colour.
Thin lines, wires.
3

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Example of wiring diagram
Earth connection point 4, earth connection 1 and wire 2.
Earth connection to circuit card.
Earth connection without wire.
Same splice can be drawn on several diagrams. The wire
from the splice to the earth connection point will only be
drawn and coded on one diagram. On the other diagrams
will only the earth connection point be written besides the
splice.
4

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Component wiring diagram index
Component wiring diagram index
AA
Power supply, starting system ........................................................................................ page 8
AB
Remote main switch ....................................................................................................... page 9
AC
Power distribution ........................................................................................................... page 10
AE
ADR, main switch ........................................................................................................... page 11
BA
Vehicle ECU .................................................................................................................... page 12
BE
ACC Adaptive cruise control ........................................................................................... page 13
BI
Instrument cluster ........................................................................................................... page 14
BM
Tachograph in dash ........................................................................................................ page 15
BN
Tachograph in shelf ......................................................................................................... page 16
BU
Dynafleet ........................................................................................................................
page 17
BX
FMS Gateway .................................................................................................................
page 18
BY
Volvo link (VERS-SAM) ..................................................................................................
page 19
CM
Engine interface ..............................................................................................................
page 20
CO
Engine D9 .......................................................................................................................
page 21
Engine D12 ..................................................................................................................... page 22
Engine D16 ..................................................................................................................... page 23
CP
ISX functions, 12V trailer ABS converter (AUS only) ......................................................
page 24
CS
Engine ISX (AUS only) ...................................................................................................
page 25
CU
Fuel filter water drain ......................................................................................................
page 26
DB
Gear selector ECU .........................................................................................................
page 27
DE
Geartronic automatic gearshift .......................................................................................
page 28
DI
Powertronic .....................................................................................................................
page 29
DM
Retarder manual gearshift ..............................................................................................
page 30
DN
I-shift ...............................................................................................................................
page 31
DQ
Power take off .................................................................................................................
page 32
DU
Diff-lock ...........................................................................................................................
page 33
EE
ABS basic, D-version ......................................................................................................
page 34
EI
ABS/ASR D-version ........................................................................................................
page 35
EO
EBS ECU ........................................................................................................................
page 36
EP
EBS modulators ..............................................................................................................
page 37
FA
Air-suspension ...............................................................................................................
page 38
FG
Load indikator .................................................................................................................
page 39
FI
Bogie lift A-ride ...............................................................................................................
page 40
FK
Bogie lift A-ride with axle load limiter ..............................................................................
page 41
FM
Axle lock, self steered axle .............................................................................................
page 42
FO
Electronic steered axle ...................................................................................................
page 43
FP
Hydraulic steered axle ....................................................................................................
page 44
5

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Component wiring diagram index
FQ
Air dryer ..........................................................................................................................
page 45
FU
Central lubrication system ..............................................................................................
page 46
GA
LCM head lights ..............................................................................................................
page 47
GB
LCM trailer ......................................................................................................................
page 48
GC
LCM rear lights ...............................................................................................................
page 49
GE
Rear lights overhang .......................................................................................................
page 50
GF
Rear lights, India/Korea ..................................................................................................
page 51
GG
Trailer connections, RIGID ..............................................................................................
page 52
GH
Trailer connections, TRACTOR .......................................................................................
page 53
GK
Trailer connections (AUS only) .......................................................................................
page 54
GM
Wiper, washer .................................................................................................................
page 55
GQ
Horn ................................................................................................................................
page 56
GU
Headlights adjust ............................................................................................................
page 57
HG
Climate unit, CU,-BAS,-MCC,-ECC ................................................................................
page 58
HI
Air heater ........................................................................................................................
page 59
HM
Water heater ...................................................................................................................
page 60
HP
Short stop cab heater .....................................................................................................
page 61
HY
Climat unit, CU,-HEAT,-ACMAN,-ACAUT . .......................................................................
page 62
HZ
Air cooler, Brazil ..............................................................................................................
page 63
IA
El. heated/adj. seat ........................................................................................................
page 64
IE
El. heat/adj. mirrors, El. window winders .......................................................................
page 65
IF
Foldable mirror bracket ...................................................................................................
page 66
IH
Interior light .....................................................................................................................
page 67
IM
Central locking, immobiliser ............................................................................................
page 68
IQ
El. sunroof, cig. lighter, refrigerator ................................................................................
page 69
IR
12V power supply ...........................................................................................................
page 70
IS
SWM, SRS. Air-bag ........................................................................................................
page 71
IU
Radio ..............................................................................................................................
page 72
IX
Integrated telephone .......................................................................................................
page 73
IZ
Backup camera ...............................................................................................................
page 74
KA
Cab tilt ............................................................................................................................
page 75
KE
Load light, 5:th wheel lamp .............................................................................................
page 76
KI
Light sign ........................................................................................................................ page 77
KM
Beacon warning light ...................................................................................................... page 78
ME
Extra fuse block, key switch relay ...................................................................................
page 79
NA
Body builder (BB), auxsw-6 and swapbody ....................................................................
page 80
NC
Body builder (BB), ELCE-CK, BBM, PTO2 .....................................................................
page 81
NI
Extra spotlamps front/roof, max 4x70W ..........................................................................
page 82
6

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Component wiring diagram index
NK
Burglar alarm ..................................................................................................................
page 83
NU
Body builder (BB), DUAL-SPEED ...................................................................................
page 84
OA
Tyre pressure monitoring (TPM) .....................................................................................
page 85
XA
Bus J1708/J1587 ............................................................................................................
page 86
XB
Bus J1939 .......................................................................................................................
page 87
7

Group 37 Wiring diagram FM9, FM12, FH12, FH16, NH12 Component wiring diagrams
Component wiring diagrams
T3017629
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Volvo Trucks FM9 FM12 FH12 FH16 NH12 VERSION2 Wiring Diagram Manual
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Description
Volvo Trucks FM9 FM12 FH12 FH16 NH12 VERSION2 Wiring Diagram Manual
This manual covers the wiring diagrams for the FM9, FM12, FH12, FH16, and NH12 VERSION2 trucks with CHID A610059 and CHID B411901. The information and service procedures in this manual are based on designs and methods studies carried out up to September 05.
Wiring Diagram Manual Covers:
- Example of wiring diagram
- Component wiring diagram index
- Component wiring diagrams
- Illustrations index
- Illustrations
- Fuses
- Relays
- Wiring harness illustration index
- Earth connections
- List of earth connections
- List of connectors
- List of components
- Abbreviations
- Cable colour code
This is a high-quality manual, and all pages are printable. It is available in English and is compatible with all versions of Windows & Mac. Adobe Reader is required for viewing.