out HONDA CIVIC 1996 6.G Workshop Manual

- How the Circuit Works
Battery voltage is supplied through tuse 56 to the
A,/C compressor clutch r€lay contacts at all times.
With the ignition switch in ON (ll), vollage is applied
to the coil of the A,/C compressor clutch relay
through fuse 17. When you push the A,/C switch
ON, and the heater fan switch is in position | , 2, 3,
or 4, a "ground" input is provided to the engine
control module (ECM) or powertrain control module
(PCM) through the l'lC thermostat and the l'lC
pressure switch.
The A,/C compressor clutch relay is grounded by the
engine control module (ECM) or powertrain control
module (PCM). When energized, the A'lC
compressor clutch relay allows battery voltage to
turn on the A,/C comDressor clutch.
The A,/C ON indicator light comes on when the A,/C
system is requested.
A,/C Thermostat
The A'lC thermostat is located on the evaoorator
housing. The A,/C thermostat turns off the A,/C
compressor clutch if the temperature at the
evaporator goes below 3'C (37'F). This prevents
condensation from freezing on the evaporator fins
and blocking the air delivery into the passenger
compartment. The blower motor will keep running
when the sensor turns off the comDressor.
A,/C Pressure Switch
The fuC oressure switch is located in the condenser
outlet line where refrigerant is in a high
temperature/high pressure liquid state. The switch
will sense abnormally high or low pressure, and
open the circuit. This removes ground, and the
compressor will stop running.
Thermal Protectot
The thermal protector, located on the A,/C
compressor, opens and turns the compressor off if it
senses high temperature. Once the compressor
cools, the switch will close and the compressor will
begin running again.
Refer to the Service Manual (Section 22,
Air Conditioning) for specific tests or
troubleshooting procedures.
62-3

Rear Window Defogger
- How the Circuit Works
'96198 Models
Voltage is applied at all limes through tuse 50 to the
rear window detogger relay (contacts). With the
ignition switch in ON (ll), voltage is applied through
tuse 16 to the rear window defogger switch.
When you turn the switch ON, voltage is applied to
the defogger timer circuit. The timer circuit supplies
voltage to the rear window defogger relay (coil). The
relay energizes and supplies voltage to the rear
window defogger. The defogger grid then heats the
rear window to remove any condensation from the
glass.
The defogger timer circuit will automatically turn off
the rear window defogger after about 25 minutes.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
'99100 Models
Voltage is applied at all times through fuse 50 to the
rear window delogger relay (contacts). With lhe
ignition switch in ON (ll), voltage is applied through
fuse 16 to the heater control oanel.
When you turn the rear window defogger switch
ON, a signal is sent to lhe defogger timer circuit
built-into the heater control oanel. The timer circuit
supplies voltage to the rear window defogger relay
(coil). The relay energizes and supplies voltage to
the rear window defogger. The defogger grid then
heats the rear window to remove anv condensation
from the glass.
The defogger timer circuit will automatically turn otf
the rear window defogger after about 25 minutes.
Refer to the Seryice Manual (Section 23, Electrical)
for specific tesls or troubleshooting procedures.
64-2
I
a
a

- '99-'00 Models
NOTE: Fuse 31 isJtot with lgnition Switch in START (lll) and clutch pedal depressed or A,,/T gear selector inPARK (P) or NEUTRAL (N), see Starting System, page 21 ,2i-1, ot 21-2.
UNDER"DASHFUSEiRELAYBOX
I
I
I
I
I erouna
BrakeBulbChsckCheuh
NTEGNATEDcot{TRoLUNITftoa 64vEw a7
I Bi?[lT':i,
S€6 GroundDistribution,pago 14-7.I
I
c420PHO|O 6ivtEw 53
c551PHOfA 63c419PHO|O 63 |(r;'Used)
1514
r----4(--.1 DAYnMEI q* * |RUNN|NG
Llt:i-ib'f#Iu'"'' i---Y -- """* i
FED/GFN I c419 :
18 Jl iE?'8' :f ?-'! uloen-oasx 'I I I FUSE/RELAY
| | lP9l_- :
1 Y Cs51".o'o"" ! iffl1oru"
l:
I Sss GfoundI Distribution.I pag€ 147.
TY
tt
L_l.'-4o.'
Fr,lrs 3i
--Iil;--------l
3m" ) 9ff" s"" po*"r I
\, See Starting system. I "- . Distribution. l- pasezr.zi-t.'or'ztlz. ._____=Fl}_*t0"_____.1
l3.f ftT:4""
Bulbchekoutp$
L----------
,.. I
o"n" tot'
c+l
i
- -
F-; ffi ;-
- - -
I [i;"s"'"."I rt^ amre I vir:i i,
t (R ' rNprcAroR uGHr I
i Y lBn rcll6T6tl I
| | (usA! (canrda) |L--*-:J- -:--'-- J85Y85Yo""'"T|
"";%u,
"""'"';i"a#;",
\e#1k"
I
f,............ c44,
f $?'#"ot'to'-*'1;;
GBN/FED II PHOIO 22
5fi ennxe rluroI ' I LEVEL SWITCH
| /_,? lfJ",ii"."gl'.-
w::::"
"'-1":::::-.
! 3:"'lll"*l
".-l I
L__l+: G40lPHOIO 57
l-rlrl PARKTNGI ' I BRAKE SWITCH ,
lIdft"f[]r'"r'" i
c"n"o":- "igt-ol'- - - - - j
71-1

How the Gircuit Works
All Except GX
Do not smoke while working on the fuel system.
Keep open flame away trom the work area. Drain
fuel only into an approved container.
A thermistor is mounted in the fuel tank unit. When
the thermistor is cool, its resistance is very high.
When the thermistor's temperature increases, its
resistance decreases. Fuel in the fuel tank transters
heat away lrom the thermistor fast enough to keep it
cool so the thermistor's resistance stays high and
lhe low fuel indicator light does not come on. When
the fuel level drops below the thermistor, the
thermistor's temoerature increases. Without the fuel
to cool it, the thermistor's resislance decreases,
allowing current to llow through the low fuel
indicator light and the thermistor to ground, and the
low fuel indicator light comes on.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
GX
The PCM turns on the low fuel indicator light when
the fuel level is low. The PCM will also blink the
indicator light when a problem is detected by the
fuel tank pressure sensor or the fuel tank
temperature sensor.
Refer to the Service Manual GX Supplement
(Section 11 , Fuel and Emissions) for specific tests
or troubleshooting procedures.
74-1

Gauges (cont'd)
- How the Gircuit Works
When the ignition switch is in ON (ll) or START (lll),
battery voltage is supplied through fuse 25 to the
gauges in the gauge assembly.
Speedometer and Odometer
The odometer and soeedometer drive circuits
receive pulses from the vehicle speed sensor
(VSS). The pulse rate increases as the car
accelerates. The frequency and duration of these
input pulses are measured and displayed by the
speedometer, odometer and tripmeter.
Tachometer
The tachometer drive circuit receives pulses from
the ignition control module (lCM) in the distributor
assembly or the ECM/PCM. The solid-state
lachometer then displays these pulses as engine
speed. For each 200 pulses per minute from the
ignition control modul€ (lCM) or the ECM/PCM, the
tachometer displays 100 RPM.
Engine Coolant Temperature Gauge
The engine coolant temperature gauge has two
intersecting coils wound around a permanent
magnet rotor. Voltage applied to the coils, through
fuse 25, generates a magnetic lield. The magnetic
field, controlled by the coolant temperature sending
unit, causes the rotor to rotate and the gauge
needle to move. As the resistance in the sending
unit varies, current through the gauge coils
changes. The gauge needle moves toward the coil
with the strongest magnetic field.
The 6ngine coolant temperature sending unit's
resistance varies from about 137 ohms at low
engine temperature to between 3H6 ohms at high
temperature (radiator fan running).
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
81-2
(
Fuel Gauge (All except cX)
The fuel gauge has two intersecting coils wound
around a permanent magnet rotor. Voltage applied
to the coils, through tuse 25, generates a magnetic
field. The magnetic field, controlled by the fuel
gauge sending unit, causes the rotor to rotate and
the gauge needle to move. As the resislance in the
sending unit varies, current through the gauge coils
changes. The gauge needle moves toward the coil
with the strongest magnetic field.
The fuel gauge sending unit's resistance varies
from about 2-5 ohms at full, to about 110 ohms at
empty. When you turn the ignition switch off, the
gauge remains at the last reading until you turn the
ignition switch to ON (ll) or START (lll) again,
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
Fuel Gauge (GX)
The fuel gauge has two intersecting coils wound
around a permanent magnet rotor. Voltage applied
to the coils, through fuse 25, generates a magnetic
field. The magnetic field, controlled by the PCM,
causes the rotor to rotate and the gauge needle to
move. The PCM calculates the gas quantity in the
fuel tank by using the fuel pressure value detected
by the tuel tank pressure sensor and the fuel
temperature value detected by the fuel tank
temperalure sensor, and outputs the signal to the
gauge assembly. The gauge needle moves toward
the coil with the strongest magnetic field.
When you turn the ignition switch off , the gauge
remains at the last reading until you turn the ignition
switch to ON (ll) or START (lll) again. When the
PCM detects a malfunction with the fuel pressure or
temperature, or detects a gas leak, the PCM
reduces the fuel meter to 0.
Refer to the Service Manual GX Supplement
(Section 11 , Fuel and Emissions) for specific tests
or troubleshooting procedures.
a
a

I
\
)
FED/ALX
I(GX 6)('96-'98 Sedans except GX 14)('99100 models except GX 18)
FED/BLX
t=Male-Female
terminals reversedfor'99-'00 models
REO/ALK
All except'99r00
Sedans
c562 r
vlEw 42
FED/BIX
All Exc€pt'99'00
Sedang
FED/BLX
All except'99100 '99'00
Sgdans S€dans
'99'00
godans
RIGHTINNERTAILLIGHTPage 110-4
c617
FED/ALK
'99r00
Sedans
All exc€pt'99"'00
Sedans
'99-'00
Sodans
"'*.jx""'r{ "*^*".*:trt
"ao,"a" Iql
\/
LEFTINNERTAILLIGHTPage 110-4
c613
LEFTBRAKELIGHT/OUTERTAILLIGHTPage 110-4
RIGHTBRAKELIGHT/OUTERTAILLIGHTPage 110-4
c605c604 3
FED/BLKFED/ELK
FEO/B!K
(99-'00Sedans 1)
RED/BLX
Sedans 'l)
\
RIGHT INNERBRAKELIGHT/TAILLIGHTPage 110-3
LEFTLICENSEPLATELIGHTPage 1 10-3or 110-4
RIGHTLICENSEPLATELIGHTPage 110-3or 110-4
\/
RIGHTOUTERBRAKELIGHT/TAILLIGHTPage 1 10-3
LEFT INNERBRAKELIGHT/TAILLIGHTPage 110-3
LEFTOUTERBRAKELIGHT/TAILLIGHTPag€ 110-3

\
- All Coupes and'96-'98 Sedans
1'so'sa s"o"n" "*cept 491!]('99-'00 models except GX l8)
*=Male-Female
terminals reversedfor'99-'00 models
RED/BLK
c605
RIGHTLICENSEPLATELIGHT
2^
@
LEFTLICENSEPLATELIGHT
2^
@
".,,*-fJr
RIGHTOUTERBRAKELIGHT/TAILLIGHT
See BrakeLights
r:d
*.-*L=tBLK
RIGHTINNERBRAKELIGHT/TAILLIGHT
See GroundOistribution,page 14-10.
c517
c613PHOTO 115c604
See Brake
:rd
ALK
INNERBRAKELIGHT/TAILLIGHT
o
V
l-
AlK
1
BLK
See GroundDi6tribution,page 1410.
Y
erx I
-l
Seo GroundD istribution,page 14-10.
c613
LEFTOUTERBRAKELIGHT/TAIL.LIGHT
4
BLK
C60s 4
BLK
c604
Se€ GroundDistribution,page 14-10.
I
From page 110-2.
ryI
erx I
.- G60l
110-3

License Lights, Parking Lights, and Taillights (cont'd)
From page 110-2.
CBtl^lvl{t
3
- '99-'00 Sedans
c562
vtEw 42
FEO/BLK
18(GX 5)
REO/BLK
See BrakeLights
RIGHTBRAKELIGHT/OUTERTAILLIGHT
RIGHTLICENSEPLATELIGHT
1l
@
zY
LEFTLICENSEPLATELIGHT
1l
@
zY
LEFTBRAKELIGHT/OUTERTAIL.LIGHT
RIGHTINNEBTAILLIGHT
LEFTINNERTAILLIGHT
2^
@
rY
2A
@rY
110-4

Brake Lights
- All Coupes and'96-'98 Sedans
tl
UNDER-HOODFUSE/RELAYBOX
?-------
i t t!::o i
i ) SrTIr gee Power iI t 154 Distribution,
L--E-]-p3n:"'1--.:
Without Cruise Control
See PowerDistribution,page 1013.
BNAKE SWITCHClosed with brakepedal depressed.PHOTO 68
8 Y C3s2*nrlo." I i[o"'r?, *"r,o"no----awHr/GFN iWith Cruise Control t
*"r,n*[ ,r"r,o*[
r t 1 BRAKE SWTTCH l-'rt
LQlt'*'*t'**" l4J
n""n",.tr I o""*,1, !
o"*n"", I
*=Male-Female
terminals reversedfor '99-'00 models
GFN/II/HT13('99100 models except GX 17)GFN^^/HT2('99-'00 models except GX 10)
GFNMHT
c442fferminals'l ! -14)
PHO|O 125vtEw 54
c401
c563
(C562 '99100 models except GX) *
V|EW 42 GFN,ryVHT
Withoutoptional spoiler
r-
tPGM.FI\
withoptional spoilarGAN/
GFN/
BLK
110-15
+ 9,6,91o,",
\a

Brake Lights
- '99100 Sedans
s Y c3s2wHT/cBN I Ploroz' wHrrGRNo-l.
'_-._-_:---- UNDER.HOODt-u!E az I ErreE/oEr AvI FUSE/RELAYxonn,aToP rrt6aSso PowerDistrlbdlon,a?,oJ.,
| ?--'-----------t oaoe tG13. IL--:t------------J
Se€ PowerOigtribution,pags 1G13.wfrr/GBN iWith Cruise Control I
!--
$PGI\,4-FI
Without Cruis€ Contd
BRAKE SWITCHClosed with brakepedal depressed.PHOTO 8
o"na", I
--f (fermtnals 1'l-'14)
o""-", I ff,o*tuo. t"
,o*11, I Fol%' -,, - v{w, GR{GX 131 I PrOrO 5/ ----
o"n*"t I ll
! tl wrhoutrn ! n ,uil,lg,'"%,,, i :$ly
*"*",1 if;#,,o1 |
-l-
__""*!m4",;,"' l| [
4;[
vfithoplionalspoiter
,.Fr[ RtcHT BRAKE /t rllcH
LE€,, ffL',61g." \9/ $"'f,iJ2Y 1Y LIGHr
S€€ GroundDist bution,page 1+1t.
I
I
Io
G601
110-16
!