2003 HONDA CIVIC ecm

Gonnectors and Harnesses
aGonnector Index
ldentification numbers have been assigned to in-line connectors. The number is preceded by the letter "C" for connectors, "G" for groundterminals or "T" for non ground terminals.
HamessLocationEngine CompartmentDashboardOthers {Floor, Door,Trunk. and Roo{lNot€s
Starter subharnessC102 and C103T1 and T2T101 and T102
(see page 22-15)
Battery ground cableT3G'l and ( -{see page 22-l!)
Engine ground cableT4{see page 22-14)
Engine wire harnessCl0l through C104G 101(see page 22 16)
Engine compartment wire harness{rioht branchiG201 and G202(see page 22 18)
Engine compartment wire harness(left brench)G301(see page 22 18)
Engine compartment wire harness(dashboard)c401C451 and C452C501 through C503c551c851G402
(see page 22-18)
EPS subharnessC151 and C152G'151\see page 22 241
Dashboard wire harness Alleft branch)C504 through C510G501 and G503(see page 22-26)
Left side turn signal lightc506(see page 22-26)
Dashboard wire harness A(right branch)C50l through C503C5ll through C515C852 and C853G502
(see page 22-26)
Right side turn si9nal lightsub harnesslsee page 22-26)
Dashboard wire harness BC40l through C403c510G40l
(see page 22-30)
ECM wire harnessc101cl52C451 through C453c511G451
{see page 22-32}
Floorwire harness (front side)C402 and C403 G551c453C508 and C509c512C551 an.l C55?
(see page 22'34)
Floor wire harness (rear side)C553 and C554(see page 22-34)
Roo{ wire harnessc507(see paqe 22-38)Hatch wire harnessC553 and C554(s6e paqe 22'39)Driver's door wire harnessC504 and C505(see paqe 22-40)Passenqer's door wi.e harness514 and C515(see oaoe 22-41Te harness)552(see oaqe 22-42i/C wire harnessc851 rhrouoh c853(see paqe 22.43i
22-13

Connectors and Harnesses
Engine Wire Harness
Camshaft position (CMP) sensorLllr sensorEC[,4 connector AECI/l connector BEngine coolant temperature (ECT)
sensorEngine oil pressure switchEVAP canister purge valveldle air control (lAC)valve
lgnition coil No. llgnition coil No. 2lgnition coil No. 3lgnition coil No. 4Iniector No. 1Inlector No.2Iniector No.3Iniector No. 4Intake air temperature {lAT) sensor
TDC sensorThrottle position (TP) sensorVehicle speed sensor (VSSI
VTC oil control solenoid valveVTEC oil pressure switchVTEC solenoid valvec 101
c102
233
242
Transmission housingLeft side of engineRight side ofengineUnder glove boxUnder glove boxLeft side of engine
Bight side oI engineLeft side of intake manifoldLeft side of intake manifoldMiddle of engine compartmentMiddle of engine compartmentMiddle of engine compartmentMiddle of engine compartmentMiddle of engine compartmentMiddle of engine compartmentMiddle of engine compartmentMiddle of engine companment
28
1845672524201912
811102729303
22
12333332222233
322220
Left side of intake manifoldLeft side of engineLeft side of intake manifoldTransmission housingRight side o{ engineRight side of engineRight side of engineUnder right side of dash
Front of engine companment
Front of engine compartment
ECM wire harness {see page22-321Starter subharness (see page22-15)Starter subharness (see page22 151
Connector to Harness Index (cont'dl
22-16

Connectors and Harnesses
Connector to Harness Index (cont'd)
Engine Compartment Wire Harness (Dashboard)lcont'dl
Connector or TerminalCavitiesLocationConnectstoNotesFog light connectorUnder'dash fuse/relay boxconnector F (see page 22-45)Underdash fuse/relay boxconnector G (see page 22-45)Underdash fuse/relay boxconnector H (see page 22'45)Under-dash fuse/relay boxconnector | (see page 22'45)Under-dash fuse/relay boxconnector J (see page 22-45)c 151
c401
c451
c452
c501
c502
c502
c503
c851'14
2
3
1
I
9
6
6
5
5
12
10
112
10
3
5
8
2
'10
4
8
5
10
1
Under maddle of dashUnder left side of dash
Under left side of dash
Under left side of dash
Under left side of dash
Under left side ol dash
Under right side of dash
Under right side ot dash
Under right side ot dash
Under right side oJ dash
Under right side oI dash
Under right side ol dash
Under right side oJ dash
Under right side oJ dash
Under middle of dash
Under right side of dash
EPS subharness {see page 22-24)Dashboard wire harness B(see page 22-30)ECM wire harness (see page22-321ECM wire harness (seo page22 32)Dashboard wire harness A(see page 22-26)Dashboard wire harness Alsee page 22-261Dashboard wire harness A(see page 22-26)Dashboard wire harness A(see page 22-26)Floorwire harness (see page22-34l',VC wire harness lsee page22-43\
Oplion
Canada
USA
G4021'IEody ground via engine..mdarlma.t w,rc harncss
22-22

Connectors and Harnesses
Connector to Harness Index (cont'd)
ECM Wire Harness
Connector or TerminiFI Re-lcavitiesL LocationConnectstoNotesArr ruer t/vrl ralo sensor retayData link connectorEC[/l connector EPGM-Fl main relay 1PGM-Fl main relay 2Under-dash fuse/relay boxconnector D (see page 22 45)Underdash fuse/relay boxconnector E lsee page 22-45)under-dash fuse/relay boxconnector R lsee page 22-45)c10'1
c152
c451
c452
c453
c511
8761
2
3
4
1'I
I
10
14
12
44
6
20
8
4
6
Eehind glove boxUnder middle of dashBehind glove boxBehind glove boxBehind glove boxIn the under-dash fuse/relay box
In the under-dash fuse/relay box
In the under-dash fuse/relay box
Under rlght side of dash
Under right side of dash
Under right side of dash
Under right side ot dash
Under middle oI dash
Under middle of dash
Engine wire harness (seepage 22'16)EPS sub harness (see page22-24)Engine companment wireharness {see page 22-18)Engine compartment wireharness {see page 22-18)Floor wire harness (see page22-34)Dashboard wire harness A{see oaoe 22-26)G451Under gauge assemblyBody ground via ECM wireharness
22-32

ECM WIRE HARNESS
22-33

Connectors and Harnesses
Connector to Harness lndex (cont'd)
Floor Wire Harness (Front sidel
Connec-tor or TerminalI Refuavftres Location connects to Nol6sDriver's seat belt switchDriver's side airbag inflatorDriver's side impact sensorLeft side seat belt buckle tensionerMemory erase signal (MES) connectorParking brake switchPassenger's seat belt switchPassenger's side airbag inflatorPassenger's side impact sensorRight side seat belt buckle tensionerSRS unit connector BSRS unit connector CUnder-dash fuse/relay boxconnector P {see page 22-45)Under-dash fuse/relay boxconnector O (see page 22,45)c402
c403
c453
c508
c509
c512
11l013121995374202111
'r8
22
23
2
14
1
6
3 I Under driver's seat2 i Under driver's seat2 I Left side offloor4 Under driver's seat2 Under dash fuse/relay box1 1 Middle offloor3 Under passenger's seat2 Under passenger's seat2 Right side offloor4 Under passenger's seat18 I Under middle of dash8 Under middle of dash18 Underdash fuse/relay box
8
]
Under dash fuse/relay box
10
I
Under middle of dash
4 Under middle of dash
6 Under middle of dash
4 Under middle of dash
6 Under middle ofdash
8
I
Under middle of dash
10 Under middle of dash
4 ] Unaer middle of aasn
Dashboard wire harness B{see page 22 30)Dashboard wire harness B(see page 22-30)ECM wire harness (see page22-321Dashboard wire harness A(see page 22-26)Dashboard wire harness A\see page 22-26)Dashboard wire harness A{see page 22-26)Engine compartment wireharness (see page 22 18)OPDS unit harness (see page22-421G551IL,nder passenger's seatBody ground via floor wire
22-34

Under-dash Fuse/Relay Box
SocketRefTerminal Connects to
B
c
D
E
F
G
H
J
K
M
N
o
P
Power window relay
o
R
S
Starter cut relay
T
Taillight relay
Turn signal/hazard relay
U
W (Memory erase signal (MES)
connector)
X
Y
2
3
1
5
19
9
I
20
24
22
27
26
7
6
10
25
14
18
11
l5
to
17
28
5
6
14
13
12
10
3
:
11'10
1:
.o^
;;
4
8
2
i
nl
al
lt
2
Dashboard wire harness B {see page 22-30)
Dashboard wire harness B {see page 22-30)
Dashboard wire harness B (see page 22-30)
ECM wire harness (see page 22-32)
ECI\4 wire harness (see page 22-32)
Engine compartment wire harness (see page 22-'l8l
Engine compartment wire harness (se e page 22-181
Engine compartment wire harness (see page 22-18)
Engine compartment wire harness (se e page 22-18)
Engine compartment wire harness (see page 22-18)
Dashboard wire harness A (see page 22-26)
Dashboard wire harness A (see page 22-26)
Dashboard wire harness A (see page 22-26)
Dashboard wire harness A (see page 22-26)
Dashboard wire harness A (see page 22-26)
Floor wire harness (see page 22-34)
Floor wire harness (see page 22-34)
ECM wire harness (see page 22-32)
Dashboard wire harness B (see page 22-30)
Multiplex control unit service check connector
Optional connector
Optional connector
Floor wire harness (see page 22-34)
{Plugs directly into the multiplex control(Pluqs directlv into the multiDlex control
unat)
unrl)
I
13
tn--rlI U LI L.] L.Jh--n-UL]L]UL]
I] L] L] LI L]
!3 12
22-45

Power Distribution
Fuse to Components lndex
Under-hood Fuse/Relay Box
Fuse
Number
AmpsWire ColorComponent(sl or Circuit(s) Protected
'I204BLUI/ELCondenser fan motor
BLU/REDAy'C compressor clutch
15AWHT/GRNDash lights, Front parking lights, Front side marker lights, License plate
liqht, Rear side marker liqhts, Tailliqhts
7.5AWHT/BLUCarqo area liqht, Ceilinq liqhts. lqnition Kev liqht. Sootliohts
204BLU/BLKRadiator fan motor
510AWHT/BLKTurn siqnal/hazard relav, Turn siqnal liqhts
15AWHT/BLKCKP sensor, ECM, IAC valve, lmmobilizer control unit-receiver, Injectors,
PGM-FI main relav 1 and 2. TDC sensor
715AWHT/GRNBrake lights, Brake signals (to ABS modulator-control unit, Cruise control
unit, ECM)
BLU/REDi1 Orns
820AWHT/GRNABS modulatorcontrol unit
910AWHT/REDAudio unit, Data link connector (DLC), Gauge assembly, lmmobilizer
control unit-receiver, lmmobilizer indicator light. Keyless receiver unil,
lvlultiDlex control unit
1040AWHT/REDABS modulator-control unit
1130AB LK/YE LNoise condenser, Rear window defoqqer
40ABLU^^/HTBlower motor
IJ40AWHT/BLKNo. 7 fuse (in the under-dash fuse/relav box), Power window relav
1440AWHT/REDNo.2 and No.3 fuses (in the under-dash fuse/relav box)
t515AREDI/ELDaytime running lights control unit (Canada), Daytime running lights relay
{Canada), Hioh beam indicator liqht. Left headliqht
16204WHTMultiplex control unit
1715AREDDavtime runninq liqhts control unit (Canada). Rioht headlioht
1860AWHTiBLUEPS control unit
1980ABatterv. Power distribution
2040A'
50A'?
WHTlgnition switch (BAT)
* 1: USA" 2. Canada
O: Spare fuse
t t"| lll Itt 4t I
l l---- E'l E,l E,l r--r r---r t__J i; i6'!/'
E,l E,l E,l Eol E l f__--lI l'lr]n | |I r L__J,a ,..r^{-------l^-,
n[:]$"Lrt " N2, nf - r^l
22-46