1999 HONDA CIVIC ac system

Contents
How to Use This Manual ICircuit Schematics (see Circuit Index)Fuse/Relaylnformation 6Ground-to-Componentslndex 6-6ComponentLocationPhotooraohs 201Conriector Views 202
Circuit Index
Accessory power socket 155Air conditionerAir delivery'96198 models 61'99-'00 models 61-2Blower controls'96198 models 60'99100 models 60-1Compressor controls 62Fans 63Anti-lock brake system (ABS) 44A/T gear position indicatorCVT 89All except CVT 89-1Automatic transmission controlsAll '96-'98 models except CVT and GX 39All '99100 models except CVT 39-8All GX models 39-8'96-'98 CVT 39-4'99100 cw 39-12Back-up lightsCoupe and Sedan 110Hatchback l'10-1Brake lightsAll Coupes and'96-'98 Sedans 110-15'99-'00 Sedans 110-16Hatchback 110-17Brake system indicator light'96198 models 7'1'99100 models 71-1Ceiling light 114-3Charging system 22Condenser fan 63Console lights 114Cruise control 34Dash lights 114Daytime running lights 110- 13Engine coolant temperature gauge 81-1Fog lights 110-10Front parking lights 110-2Fuel gauge 81-1Fuse/relay boxUnder-dash 6Under-hood 6-4Underhood ABS 6-3Gauges 81Ground distribution 14Ground-to-Componentslndex 6-6Hazard warning lightsAll except '99100 Sedans 110-6'99100 Sedans 110-8Headlights 110-12Headlight switch 100Heater - See Air ConditionerHorn'96197 models 40'98 model 40-1'99100 models 40-2lgnition key reminder 73lgnition systemAll '96198 models except Dl685 20All '99100 models except D16Y5 with Mn 2O-2All D1685 engines 20-2'99-'00 D 16Y5 with M/T 20
lndicators 80Integrated control unit 70lnterlock systemAll except'96J98 CVT 138'96198CVT 138-1License plate lightsAll Coupes and '96-'98 Sedans I l0-3'99100 Sedans 1 10-4Hatchback 110-5Low fuel indicator light 74Moonrool'96197 models |22'98-'00 models 122-1Odometer 81Oil pressure indicator light 80-3Power distributionBattery to ignition switch, fuses, and relaysFuses to relays and components 10-2Power door locksAll models without keyless entry 130'96-'98 models with keyless entry 130-2'99100 models with keyless entry 130-12Power mirrorsWithout detogger 141With defogger '141-2
Power windows 120Programmed fuel injection system (PGNr-Fl)All '96-98 models except D1685 23All '99-'00 models except D16Y5with M/T and D1685 24All D1685 engines 25'99100 D16Y5 with M/T 23Radiator fan 63Rear window defogger'96-,98 models 64'99100 models 64-1Seat belt reminder 73Security system'96.'98 USA HX, LX, EX 133'96-'98 Canada EX, Si 133'99TOO USA HX, LX, EX, DX.V Si 133-4'99100 Canada EX, Si 133-4All CX and DX models 133-8Speedometer 81Starting systemA./T (All except Dl685) 21A"/r (D16Bs) 21-1Manualtransmission 21-2Slereo sound system 150Supplemental rastraint system (SRS) 47Tachometer 81TailliqhtsAllboupes and'96-'98 Sedans 110-3'99100 Sedans 1 10-4Hatchback 110-5Trunk light 114-3Turn signal lightsAll except'99100 Sedans 110-6'99-'00 Sedans 1 10-8Vehicle speed sensor (VSS) 33Wiper/washerFront 91Rear 92
10

How To Use This Manual
The next few pages describe how this manual is organized. They also
explain what kind of information the manual contains, what that
informalion means, and how to use it to troubleshoot electrical problems.
Circuit schematics break the entire electrical system into individual
systems, like the Low Fuel lndicator Light on the nelit page.
Only electrical components that work together are shown together,
so you won't be distracted by unrelated wires.
Explanations of the abbreviations and svmbols used in the schematics
begin on page [Fl. You'll need to know what they mean before you can use
a schematic effectively.

Fuse
NumberAmpsPageFuse Name
(RR WIPER
RR WASHER)
i R HiL HIGH BEAM | 10
L H/L HIGH BEAM
| (PAIV RR-L)
i (P/vv RR-R)
(rGN CO|L)
10I (P,^/V AS)
Component or Circuit Protected
Not used
Not used
Rear wiper, Security system (option)
(Vehicles pre-wired for accessory security system)
'10r 1n-2
I
| 1 10-12i Right headlight, DRL control unit (Canada)
Lett headlight, DRL control unit (Canada)
I ro-rsSecurity system (option)
| 120-2 | Left rear window motor
Right rear window motor
lgnition coil ('98-'00 models except GX)
| 120-1 | Front passenger's window motor
i (PiW DH)| 20 1 12O I Driver's window motor
TURN LIGHTSHazard warning switch
FUEL PUMP
(SRS UNIT)
PGM-FI main relav, SRS unit
(cRUrsE CoNTROL)
/KtrVt trSS\
Stereo radio tuner ('96-'98 USA: LX, EX, and HX),
Cruise control main switch, Keyless door lock
control unit ('99-'00 models with keyless entry)
15ALTERNATOR
SP SENSOR
l-a10-4I ELD unit, Gauge assembly, TCM (96-'98 CW, PGM-FI
16I RR DEF RELAY7.510-8I Rear window defogger ('96-'98 models), ABS control
I unit. Power mirror switch ('99-'00 models except GX)
i-HEATER r/C
I RELAY
Power mirrors ('96-98 models and all GX models),
Air delivery, Blower controls, AilC compressor
controls, Fans
I (RUNNING LIGHT
I RELAY)
1 7.5 1
tl
I DRL control unit (Canada)
i BACK-UP LTGHTSi Back-up lights
(RUNNING LIGHT)DRL control unit (Canada)
I R H/L LOW BEAM'10 l11o-12Right headlight
I L H/L LOW BEAM | 101110-12 | Left headlight
(cont'd)
(SRS)SRS unit
6-1

- Under-dash Fuse/Relay Box (cont'd)
Fuse/Relay I nformation
Fuse
NumberFuse NameAmps
(P/W RELAY)
(S/R RELAY)
FR WIPER
FR WASHER
LO
Page
10-7 |
I
Component or Clrcuit Protected
i Power window relay, Moonrool
Front wioer/washer
CIGARETTE
LIGHTER
ACC SOCKET
10-7Accessory power socket
I RAD|O CLOCK
I
110 115)l
tl
1O-7 |
I
Stereo radio tuner ('96198 models), Audio unit ('99100
model)
Not used
i 7.5i 114 iDash & console lights
I srnnrensrorunl | 7.slzl , zt -t , ! eCU-n main retay, PCM/ECM, Integrated controt unit
I ot 21-2 t
I LICENSE LIGHTS I 7.5
I rerr uesls I
Parking lights, License plate lights, Tail lights| 1oo-1 |
tl
| (f NTERLOCK UNIT) | 7.5 | 10-12 I Interlock system
* = '98 models
6-2

Fuse
NumberFuse NameAmpsPage
BATTERY
Component or Circult Protected
Power distribution
lgnition switch
INTERIOR LIGHT | 7.5 | 10-10 | DLC, Ceiling light, Trunk light
FI E/M15 i(20 GX) i
i PGM-FI main relay, Fuel injection relay (GX)
Not used
POWER WINDOW| 10-10 | Power window relay
BACK UPStereo radio iuner ('9G'98 mod€ls), Audio unit ('99100
models), Heater control panel, PCM/ECM, TCM (9e'98
cvr)
HEADLIGHT
REAR DEFROSTER I
DOOR LOCK UNIT,
ROOF
i 10-12i Headlights
Not used
Rear window defogger relay
Power door lock control unit (all except '99-'00 models
with keyless), Keyless door lock control unit ('99-'00
models with keyless), Moonroof
i HORN, SrOP Lri 10-13i Horn relay, Brake switch
HAZARDHazard warning switch
OPTIONI 10-13I Security system (option)
i HEATER MOTOR Ii 10-1 i Blower motor relay
(CONDENSER FAN)
COOLING FANl1o-1
Condenser Jan relay, A'lC compressor clutch relay
Radiator tan relay
&5

Power Distribution
- From Battery to lgnition Switch, Fuses, and Relays
STARTERPage 21,21-1, ot 21-2
.d1.ro"rr" i
I lsoLENorD I
FUSE 42tG1
BATTERY
To UndeFhood ABSFuse/RelayBox onpage 10-14.
FUSE 47EACK UP
T1
FUSE 41AATTEiY&A
I OETECTOR (ELD) UNIT
tii::.':
UO
PHOfO U
,
I
I
I
t.------J
ELECTRICAL LOAD
i--i rL---- J ELKml
!" Gl
FUSE 4e
0ro{ Urod)FUSE '13Ir|]EAtOAUGHT?.:ta
FUSE 46POWEaWll'IDOW
FUSE /t4
r| E/M1{rA204 (DrGa5)
FUS€ 48TtEADL|a}fT9|'A
FUSE 50NEAAOEFOCGER304
+------, f| ',
I ruse sr I oooa I
J LOC|( uNrr \
il-.4WHT/BLK
Itr '\
\
I
I
I
c352
vlEW 27
c415Se€ Pow€r Distribution,pag6s 10-10 and 10-11.See Power Distribution,page 10-12.
I
\
L------BLK/VI/HT
1
--------Jc415
Vehiclespre-wired foraccessorysecuritysystem
c913PHOTO 6A
FUSE 16AR DEFFEIAY
FUSE 17HEATEA!'/C FEIAY
FUSE 18{RUNNINOL|GHlFET.AY)7.54
FUSE 27CIGAFETTEL|oHTEAACC SOCKET ta
arse ra fBADIO \
?o?"* \15A ('94 raodcr)
ff".acc0)
llL--------J
See Power Distribution,pages 10-8 and 10-9.
STARTERCUT RELAYPage 21-2
P/lolo 135 (99 00)
See PowetDistribution,page 10-7.
Vehicles pre-wired for acces-sory security system
To Fuse 3'|, for delails, see StartrnqSystem, page 21,21-1 , ot 21-2. -
10

Power Distributiofl (cont'd)
- From Fuses to Relays and Components
R8€3
5A
tl
tl
PGM.FIMAIN RELAYPag$ 23,24, ot 25PHOfO U
GRY (r8)or Cnl|
Gi Ul|T
llfllvrtl|€n)
FUSE ,'2
nnx ucms7.ta
I
\
\
I
I
c801PHO|O 5Ac423 r'lPHOTO 58c501PHO|O @vtEw 55
tl
ll
HAZARDWAFNING SWITCHPage 110-6 or 110-8vlEw 32
tt
tl
SRS UNITPags 47PUO|O 70vtt:w 51
r = MaleFemalelerminalsrevgrsed for'99-'00 models
onh no'l Wipsr GRN)
w8r Boar Wipif
'9&'00 Vlhbl.. at?wM frrdocarssy 66ourily eldcn
@
rtYELI *. 1'f
ft?'},' I
l,l m*a" ,,l*i*-
SECURITYSYSTEi' SECURIW SYSTEM
F"ontnlSSto"tott'on' S"ontnl5S]ottott'onr
Gnx I
WHT I
r---l
ll
tl
COMBINATIONWIPER SWITCHPage 92
vlEw 05
10-2

Power Distribution
- From Fuse to Relays and Components (cont'd)
FUSE 48HEAOL|SHT30A
c3s2 3
vtEw 27
WTIT/GFN
FUSF 50FEAFDEFBOSTEF30A
ooon r,ooxuxn \RooF -' I204
I
I
I
I
5t
FusE sr t
9l
;:$*fiit"rl.ru'"'""
I i*il
:::*ffi,
""'_[
tallt r--1 r--1
l-=Ji llll;i'ifr'ilrowi | | | |NEAN
DEFOGGER: L--J L--J
!EuI. ! powen KEYLEss
3g9F I oocin iocx DooR LocKI CONTROL CONTROLPHorobs ! Uttf UN|TL----J ii"j- , "n ^.UNDER-DASH r:d.r ppdro,uFUSETRELAY Box ;;;; "" ,!Fw /); - - - - - - ' - - - - - - - - - - I I P4atasa ;;"; i,
:-;-ry wHr/GFN
: I .-.-.i. -", I '-': :-'I "o''. I l "ott
i
";L____j_lU*?,?"
| .,"Iii;n*
: f'4. ii ;f' ii ,L-.-Ii"?,%' ;f5-"i4.-"'";5-{"'"r'!|L1
:! ! ::! ! :; 3$3i'9,1" r! ! I | | |
i l- l-
- - -
_:-
- ---------1 - - - - - - -
i I r'
- -
T
-
I F$r".',lP,XiI
ii{*"..0 ,' 1;;;il--l l | leox
i! ipp ii liuir'-*i |
')l 'l
l i' r--t-----'-.r--rL--------J- -------t I /---L-I
i
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l-----l i ::[ir:;?:' i ::[?:+: |
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'*'
i[.iiilr-il[-j,*---]d;1.*-;il;1,
:l I r:l I i: ts6'""?cro* i! ! L--i r--J
i ilr--,.ir...^.._^i I
'rr6-;i."
i: !:lJ',"#,",,*. i i.itc-,tr# Bgg,FooF u-oorinoor' RUNN|NG LrcHrs , ' LocK ; : ; !!gEr_.. ;;,1'y RELAYi cournol^urtr , i pase^138 :: i Swircn- -- Fj.Ti, pase 122, Paoe 110-13 or'138-1 Paoes 100. 110 2 -:Y;^:':;;;''"" :i ;hoi;,; ;: vehicrespre_wired ;!id-?iXioii.' glj:,';: ffl?3;1i,-- canada ----r l----A,/T ---,.-. for accessory -, |;r"*ir" .n 5 vtEvtl 13
10-12
secu.ity system