2000 HONDA CIVIC Light switch

Power Distribution
Circuit ldentification (conf dl
ECI4/PCM (Via A/C Fsssure switch)
,VC th€modA
Con(,ensef lan molor
A/C comFessor dulci
ECWPCM
UNDER HOOD FUSE/BELAY BOX
"*-f_
v{HT -
BLI(/RED -
UNDEN.DASH FUSE/REIAY BOXflo page 23-72)
COMBINATION LIGHT SWITCH[Io page 23 73, 74)
UNDER,DASH FUSgRELAY BOXOo page 23'74)
wnc'N ---}> Hlgl;%,s,1 lsu'r"' *,
wHT/GnN-Po#sr door lock control unilMoonrool molor
*HT/RED + Hoo5f;oA'.j1fu,uttto" *t
BLUMHT - Blowor fiolor
G()1G402
BLu/rrit{t -
BLU/lf {I -
23-68
BLI(RED - Radiator tan molor

!t
USA:
UNDER,DASH FUSEi RELAY BOX
COMEINATONLIGHT SWITCH
No.48 (304)FUSE/Frcm page \\23{8 /
No.a8 G0A)FUSE/Frcm page \\23-72 )
lo
I ' to"'to
RED/BLU _
BED/GRN _
FEO/GRN -
REDMHT -
REo/{EL -
Figltl h6adlighl (High beam)
High beam indi€tor light
Lefl headlighl (High beam)
Right headlighl (Low beam)
Letl headlighl (Low beam)
(Fuse/relay box socl(el)
(Fuss/relay box sockel)
FEo/BLK t
RED/BLK t
optioml @nn6clor loash hghls)
InEgraled control unil
Hazard waming sMch ligldGaugelighlsAudio unilnear wndow delog0er swild lighlCruiso main switdr lighlctuis€ndrcalot .. ]crmminocircu,tA/ | qsar posrrcn nor@Ior JDash lighls brighhess mnlroller
l'/T gea. pGilion console lighlHeald conlrol panel ligtn
::: I lronl oarkino liohlHqm,
n-'i6 J *t"' t"itt'9t'6
n-,sh j inn"t u'll'gl't'
:: 1 | hcense Dlale liohtsHgnr i
(cont'd)
23-73

Power Distribution
Circuit ldentification (cont'd)
Canada:
COMBINATIONLIGHT SWITCH
N0.48 {30A)
RED/BLU - Right headlighl (High boam)
FEDiBLU ----< REstsTOR
REo/GRN - HiJh beam indicator lighl
BEo/GRN - Left headlighl iH,gh beam)
L Fight headlight {Low beam)
FEo/YEL - L€ll headlight (Low beam)
(Fuse/lelay box sockel)Optional conneclor (oash lighs)
Inleg6led conlrcl unil
- Hazard wanirE swilch lighl
i- Gauge lEhts
l- Audio unil
l- Re& Yrindow delogg8r swili
t- Ctuise main swrdr ligh
l- C/uise indEator l
E g"ffiry:'l,:1':::1
Refi window delog$r swildr light
Ctuise indicalor 1 dimming,T geal posilion indicator J circu(Dasn lghls brignmess co oller
BRAKESYSTEMLIGHT
V
I
l- GFf
,,4,,0*,lf tIFLUDII ,j I LEVEL
Y
SWTCH
I8LKI
I
I
I:
G401G402
REo/BLK - l/T ged position console lqhl- Hqalor codrot panel tighl
REO/BLK -F- Lefi ) .l- g;n1J lron 9arrn! qm
FEDiBLK + Letl I
F Rqn J ouer larrqns
- I Al, I
{- i'-;*; inne' raittiotts
E fifi]t'"nt"o't't'sn"
*ro,rru -$ RcHT HEADLIGHT (Hrgh beam)
BEDiGRN -+ LEFI H EADLIGHT (High beam)
I BLK
IIPARKING IEFAKE IswrrcH I
I:
G401G402
UNDER,DASH FUSE/RELAY 8OX
lo| | PASSTNGto
/Fforn page\\a-68 l
N0.48 {304)FUSE/From page\\23-72 )
N0.18 (7.54)FUSE/From page \\?3-69 J
v
YIYEUBLK
N0.48 (40A)FUSE/From paqe \\23-68 - ,/
RED6RN
23-74

Circuit Diagram
IJNDER HOOD FUSEi RELAY BOX
-
BATTERY
LGNlTIONSWITCH
I
,'-F\I BAT I Gl /
\l_/
I
GRN/RED
I
N0.41 (80A) ,-a No 42 (40A)
ECM/PCM
f7
IWHT/RED
CHARGINGSYSTEMLIGHTI
TWHTi BLU
1323-1
ALTERNATOF

Charging System
Troubleshooting
lf the charging system light does not come onthe order listed below:
1. Baftery (see page 23-91)
2. Charging system light
3. Voltage
4. Alternator control system (USA)
5. Alternator/regulator
Charging Systom Light Test
or does not go off, or the battery is dead or low, test the following items in
ALTERNATOR 4P CONNECTORIUSA)
Wire side offemale terminals
IG(8LK/YEL}
ALTERNATOR 3P CONNECTORlC.nadal
Wre side oftemale terminals
[ ]: Canada
23-114
Charging Svstem Light Check-l :lvlake sure the charging systemlight comes on.
Check for a blown No. 15 t7.5 A)fuso .nd a blown charging sys-tom light bulb. ll the fuse .ndbulb .re OK, ropair the open inth6 WHT/BLU wi16.
Does the charging systemlight come on?
Charging System Light Chec*-2:Start the enoine.
Does the charging systemlight go off?
Volta96 ChecklMeaslre the voltage at the No. 1lNo. 2l terminal of the 4P [3Plcon-nector with the ignition switch ONflr).
R6p.ir the op6n in the BLK/YELwire b€twsen tho altornator andund€r-dash tuso/.glay box.
ls there battery voltage?

-
Wire side offemale terminals
LtwHT/8LUl
ALTERNATOR 3P CONNECTOR
lCanada)
Wire side oftemale terminals
LIWHT/BLUI
L
{W}IT/BLU)
.+1lr l2l
l3T.l-l-
ir/
(WHT/BLUI
(cont'd)
23-115
{From previous page)
Check tor an open in tho L cir'
cuit-1:1. Turn the ignition switch OFF
2. Disconnect the 4P [3Pl con-
nector from the alternator.
3. Ground the No. 3 terminal of
the 4P l3Plconnector.4. Turn the ignition switch ON (ll)
Turn the ignition swhch OFF, and
rep.ir tho open in tho wHT/
BLU wire.
Does the charging system
light come on?
Check for an open in the L cir-
cuit-2:Disconnect the No 3 terminal o{
the 4P [3PI connector from theground.
Does the charging system
light go off.r
Turn lhe ignition 3whch OFF, and
.epair the 3hort to gtound in the
wHT/Bl-U wire.
ALTERNATOR 4P CONNECTOR(USAI
r?-rl1l2l
FFI
]--
I
I l: canada

Charging System
Troubleshooting (cont'd)
Alternator Control System Test (USA): ,96 - 98 modets, ,99 _ 00 Dl6y5 (M/Tl engine
NorE: Before testing. check proper operation of the ELD by confirming with the MrL {see section r 1).
BATTERY
CAUTION: Be 3ure to use a voltmot€.with its plus terminal connected to b.t-tery plus and its minus terminal to the{P connectoi tgmrinal No. 2.c
{WHT/GRNt
Wire side oIfemale terminals
ALTERNATOR.P CONNECTOB
Check for a 3hort in the circuitIALTC linel:1. Reconnect the 4P connectorto the alternator,2. Stan the engine, and turn theheadlights {high beam) ON.3. Measure voltage between the4P connector terminal No. 2and the positive terminal ofthe battery.
ls there 1V or less?
Check for rn opon in tha wire(ALTC linol:1. Turn the headlight and igni-tion switch OFF.2. Disconnect the 32P connectortrom the ECM/PCN4.3. Check tor continuity betweenthe ECM/PCM 32P connectorterminal No. 19 and alternator4P connector terminal No. 2.
Bspair open in thg wire lrstweenthe rhern.tor .nd ECM/PCM.
Check for short in the wire (ALTClinel:1. Turn the headlight and ignition switch OFF.2. Disconnect the 32P connectortrom the ECM/PCM.3. Check tor continuity betweenthe ECM/PCM 32P connectorterminal No. 19 and bodyground.
Subslitute a known-good ECM/PCM, .nd .och6ck.It p.escribod vohago i! now avail-able, replace the original ECM/PCM.
Ropair 3hort in the wiro betweonthe ahe.nator and ECM/PCM.
ECM/PCM CONNECTOR A I32PI
'Ia18I1011
121314151718t9
7
202'l2221
262730
Wire side offemale terminalsALTC(WHT/GRNI
c{WHT/GRNI
ALTERNATORWire side oIfemale terminals
([l
T
12
1
ECM/PCM CONNECTOB A (32PI
I23478910t1
1213 14151617182021222321
262730
Wire side of I AITCfemate terminats
A
(WHT/GRN|
23-116

-
Alternator Control System Test {USA}: '99 - 0O models, except Dl6Y5 {M/T} engine
NOTE: Before testing, check proper operation ofthe ELD by confirming with the MIL (see section 11)'
BATTERY
CAUTION: Be sura lo use a voltmeter
with its plus te.minal conneqted io bat-
tery plus and it3 minus tgrminal to ths
4P connoctot tomrinal No. 2.
Wire side of
female terminals
c(WHT/GRNI
wire side offemale terminals
ALTERNATOR.P CONNECTOR
ECM/PCM CONNECTOR C 13lPI
ECM/PCM CONNECTOR C (31PI
(cont'd)
23-117
Check lor a sho.t in the circuit
{ALTC line):1, Beconnect the 4P connector
to the alternator.
2. Start the engine, and turn the
headlights (high beam) ON.
3. Measure voltage between the
4P connector terminal No. 2
and the Positive terminal of
the battery.
ls there 1 V or less?
Chcck for rn opon in the wire(ALTC lin6l:1. Turn the headlight and igni-
tion switch OFF
2. Disconnect the 31P connector
trom the ECM/PCM.
3. Check for continuity betlveen
the ECM/PCM 31P connectorterminal No. 2 and alternator
4P connector terminal No. 2
Repair opcn in the wire botweon
the alternstoi.nd ECM/PCM.ls there continuity?
Check tor short in the wire IALTC
line):1. Turn the headlight and igni-
tion switch OFF2. Disconnect the 31P connector
from the ECM/PCM.
3. Check for continuity between
the ECM/PCM 31P connector
terminal No. 2 and body
ground.
Substitute a known'good ECM/
PCM, and recheck.It prscribed voltagg is now avail'
abl€, replace tho original ECM/
PCM.
Raoair short in the wite between
the alle.nator and ECM/PCM,
1235618I10
/11611lo191 zo2122
23252621?82930JI
ALTC Wire side of(WHT/GRN) female terminals
o