For HONDA CIVIC 1997 6.G Workshop Manual

How the Circuit Works
Seat Belt Warning
With the ignition switch in ON (ll) or START (lll),
battery voltage is applied to the seat belt reminder
light. When the seat belt is not buckled, the seat
belt reminder/key-on beeper circuit in the
integrated control unit senses ground through the
closed seat belt switch. The seat belt reminder light
comes on and stays on, and the beeper beeps for
6 seconds. The reminder light and beeper will stop
when the seat belt is buckled or the timer circuit
deactivates them.
lgnition Key Warning
Battery voltage is supplied at all times to the seat
belt reminder/key-on beeper circuit in the
integrated control unit. When you turn on the
ignition key switch the integrated control unit
senses ground. lf you open the driver's door, the
door switch closes, causing the beeper to sound
until the door is closed.
Refer to the Service Manual (Section 23, Electrical)
for specitic tests or troubleshootrng procedures.
73-1

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

Indicators (cont'd)
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YEL
YEL
FUSE 2sUETER7.54
.I UNDER-DASH
IFUSE/RELAY
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S€e Pow€r Distribution,page 10-6.
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'99- 00 vehicles pre-wired foraccessory security system
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Coupe and Sedan
'96197 models
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BLU/BLK
Jf v/Er,! e'98-'00 models
TRUNK LATCHSWITCHClosed withtrunk open.
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80-2

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

A/T Gear Position Indicator (conrd)
- How the Circuit Works
With the ignition switch in ON (ll) or START (lll),
voltage is applied to the A,/T gear position indicator.
The A,/T gear position switch provides a ground for
each position. As an input is grounded, its indicator
light comes on. lf you select R, for example, ground
will be provided to the input of the A,/T gear position
indicato( and the R indicator will come on.
With the headlight switch in PARK or HEAD, voltage
is applied to the RED/BLK wire terminal. This
changes the indicator panel illumination from fixed
to controlled by the dash lights dimmer input
through the RED wire.
When the powertrain (all except '96-'98 CVT) or
transmission ('96198 CVT) control module (PCM or
TCM) detects an abnormality in the automatic
transmission control system, or when you request
diagnostic trouble codes through the service check
connector, the PCM or TCM will make the D4 (D for
CVT) indicator light blink.
Refer to the Service Manual (Section 14,
Automatic Transmission) for specific tests or
troubleshooting procedures.
\ia
89-2

Front WiperMasher (cont'd)
- How the Circuit Works
When the ignition switch is in ON (ll) or START (lll),
battery voltage is applied to lhe combination wiper
switch. and the windshield wiDer motor.
Low Speed
When you turn the wiper switch to LO, the wiper
motor's low speed winding is grounded through the
BLU wire and the LO speed contacts of the wip€r
switch at G401, and the wipers run at low speed.
ParUOfl
When you turn the wiper switch OFF, the integrated
control unit (PARK input) grounds the wiper motor
through the BLUMHT wire. The cam switch on the
motor signals the integrated control unit that the
wipers are in the PARK position; the control unit
then removes ground from the motor, and the
wipers stop in the PARK position.
High Speed
When the wiper switch is in Hl, the high speed
windings of the windshield wiper motor are
grounded through the BLUIrEL wire and the Hl
contacts of the wiper switch at G401, and the
wipers run at high speed.
Intermittent
When the wiper switch is in lNT, battery voltage is
applied through the YEUBLU wire to the integrated
control unit (lntermittent wiper ON input). The
integrated control unit (lnt€rmittenvPark Wiper
Control) grounds the low speed windings of the
wiper motor and the wipers make a single sweep
every few seconds (See Low Speed above). When
the wiper retums to the PARK position, the park
switch applies battery voltage through the
BLUMHT wire to the integrated control unit (PARK
input), and the wipers stop in the PARK position.
Mist
When you pull the wiper switch down to MIST
position, the high speed windings ot the wiper motor
are grounded through the BLU^/EL wire and the
closed contacts ot the mist switch at G401, and the
wipers make one pass across the windshield at high
speed. The ParUOff function then takes over and
the wipers stop in the PARK position.
Washel
When you pull the wiper switch toward you to turn
on the washer switch, battery vollage is applied to
the washer motor. The motor pumps fluid onto the
windshield until you release the lever; on '98r99
models, the integrated control unit (windshield
washer ON input) s€nses power at the WHT/BLK
wire terminal and runs the wipers whenever the
washer motor runs.
Refer lo the Service Manual (Seclion 23, Electrical)
for specific tests or troubleshooting procedures.
91-2

100-2
Headlight Switch (cont'd)
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LEFTBRAKELIGHT/TAILLIGHTPage 110-5
9('99100 models 18)
FED/BLK
RIGHTTAILLIGHTPage 110-5
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c605
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RIGHTBRAKELIGHT/TAILLIGHTPage 110-5
LEFTLICENSEPLATELIGHTPage ! 10-5
for '99-'00 models
FUSE/RELAYBOX
1(cruise 3)c604 5
FEO/BLK
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LEFTTAILLIGHTPage 110-5
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LEFT FRONTPARKING/TURNSIGNALLIGHTPage 110-2
RIGHTLICENSEPLATELIGHTPage 110-5
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FED/ALX
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FED/BLX
t=Male-Female
terminals reversedfor'99-'00 models
REO/ALK
All except'99r00
Sedans
c562 r
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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
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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)
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RIGHT INNERBRAKELIGHT/TAILLIGHTPage 110-3
LEFTLICENSEPLATELIGHTPage 1 10-3or 110-4
RIGHTLICENSEPLATELIGHTPage 110-3or 110-4
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RIGHTOUTERBRAKELIGHT/TAILLIGHTPage 1 10-3
LEFT INNERBRAKELIGHT/TAILLIGHTPage 110-3
LEFTOUTERBRAKELIGHT/TAILLIGHTPag€ 110-3

Back-Up Lights
- Coupe and Sedan
*=Male-Female
terminals reversedfor '99100 models
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YEURED
UNDER.DASHFUSE/RELAYBOXPHOfO 58
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2
GRN/BLK
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vtEw 59
BACK-UPLIGHT SWITCHClosed withtransmissionin reverse.
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See GroundDistribution,pags 1i1.1t.
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110
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- 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^
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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.
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Seo GroundD istribution,page 14-10.
c613
LEFTOUTERBRAKELIGHT/TAIL.LIGHT
4
BLK
C60s 4
BLK
c604
Se€ GroundDistribution,page 14-10.
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From page 110-2.
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.- G60l
110-3