1998 HONDA CIVIC circuit

Circuit Diagram
UNDER DASHFUSE/RELAY 8OX
N0.17 (7.54)
'96 - 98 Models
UNDER.HOOD FUSEi BELAY BOX
WHT/SLU BLKYEL
BLK
+
G751
3
'o
I8LK
I
G40lG402
GNITON SWITCH
N0.41 (8rA) N0.42 (40A)
COMPBESSORCLUTCHBELAY
BLUMHT
,l
(E) i,T'
BLUi BED
A/c ITHERMOSTAI BLU/REO
CONDENSEFFAN MOTOR
*F,.X,
FAN rl
BLK
{
G401G402
HEATERswrlcH
32
22-6

Condenser Fan
CONDENSER FAN RELAY 4P SOCKET
JUMPERwlRE
(cont'd)
22-9
Conden3er fan does not run at all.
Check the No. 56 (20 A) fuse in the
unde.hood frJse/relaY box, and the
No. 17 (7.5 A) fuse in the under-
dash fuse/relay box.
Reolace the fuse{s), and techeck
Remove the condenser lan rclaY'
and test it (see page 22 21i
Replace the condensei fan relav.
Check the under-hood tus6/relaY
Measure the vohage between the
No. 2 terminalofthe condenser fan
relav 4P socket and bodv ground.
ls there battery voltage?
Check the condenser lan Powersupply circuit:Connect the No. 1 and No. 2 teF
minals of the condenser fan relay
4P socket with a jumper wire
Does the condenser fan run?To page 22-10
Io page 22 11

Troubleshooting
Compressor
COMPRESSOR CLUTCH RELAY.P SOCKET
JUMPERWIRE
check the No. 56 (20 A) fuse in theunder'hood fuse/relay box, and theNo. 17 (7.5 A) fuse in the under,dash fuse/relay box.
Replace the fussls), and .echeck.
Remove the compressor clutchrelay, and test it {see page 22 21).
Check th6 und€r-hood tu3e/reby
Measure the voltage between theNo. 2 terminal of the compressorclutch relay 4P socket and bodyground.
Check the compressor clutchpow€r supply circuit:Connect the No. 1 and No. 2 termi-nals of the compressor clutch relay4P socket with a jumper wire.
Does the compressor clutch click?fo page 22-13
To page 22 14
22-12

l'f .
Electrical
Special Toofs .,....................,23-2
Troubleshooting
Tips and Precautions ..............,.................... . 23-3
Five-step Troubleshooting .............. ......... . . 23-5
wire color codes ..........,23-5
Schematic Symbols ........,................... . . .. .... 23-6
Relay and Control Unit Locations
Engine Compartment ...,..................... ... .. . 23'7
Dashboard ......................23-8
Dashboard/Door ......... 23-12*Airbags ................. ....... Section 24
Air Conditioning ......... Section 21
Aftelnator ..........."""" """ 23-112
Anti-lock Brake System {ABS) Section 19*A/T Gear Position Indicator .....................,. .... ... 23-149
Automatic Transmission Svstem .... . ....... Section 14
Batterv ......... . . . ... ...... .......23-91
Blower controls .. . ... Section 2l
Charging System ....'...........23'112
Connector ldentilication and Wire Harness
Routing .................. ......23'13
Cruise Control ............,........23-240
Dash Lights Brightness Controller ............. ....... 23-180
Fan controfs "" 23'126
Fuel PumD ........ . ........ section 11
Fuses/Refay ...............,..,,.. 23'62
PGM-FI Control System ......................,....... Section 1 1
*Gauges
Circuit Diagram ....,.,.......23-131
Fuef Gauge ...........'.'.......23-142
Gauge/lndicator .. . .. 23-129
Ground Distribution .. . 23-75
Heatei controls .. . ..... Section 21*Horn................. ...............23-196
*tgnition Switch ....................23-89
lgnition System .......,.... 23-102
*lntegrated Control Unit ....................................... 23-156
fnterlock System ,........ . . , ,23-144
Lighting System . . . .. ......... 23-161
Lights, Exterior
Back-up Lights ..'............23'171
Brake Lights .................. 23'174
Daytime Bunning Lights (Canadal ............... 23'166
Front Parking Lights ......,................ .'. .......... 23-167
Front Turn Signal Lights .......... . . ............ ..,.23-167
Headtights ....".'....-... ..... 23'167
High Mount Brake Light ...................... ... .23'179
License Plate Lights ...... 23'176
Taitfights ................ .......23'171
lnterior Lights ..-.......,, . 23-142
Moonroof ..,.................,........ 23-235
Power Distribution ....... . . .23-61
Power Door Locks .......,,,. .23'251
Power Mirrors ,..............,.,...23'206
Power Relays ....... . ...... . . .. 23-86
Power Windows ............,,....23-220
Rear Window Defogger .......................... . . ... . . 23-2OO
Spark Plugs . ..... . ........ .....23-111
Slarting System ................23-93*stereo Sound Svstem ,................. ..... ... . ... ,.,.,,23'147'Supplemental Restraint System (SRS) ... . Section 24
Turn Signal/Hazard Flasher System .......'.'....-... 23-173
*Undel-dash Fuse/Relay Box ............,.................. 23-85
vehicfe soeed sensor (VSSI """" ""' 23-140+Wipers/Washers .........,.,.,...23-214
NOTE: Unless otherwise specified, references to auto-
matic transmission (Mf) in this section include the CVT.

t
Five-step Troubleshooting
2.
1.Verify The Complaint
Turn on all the components in the problem circuit to
verify the customer complaint. Note the symptoms.
Do not begin disassembly or testing until you have
narrowed down the problem area.
Analyze The Schematic
Look up the schematic for the problem circuit.
Determine how the circuit is supposed to work by
tracing the current paths from the power feed
through the circuit components to ground. lf several
circuits fail at the same time, the fuse or ground is a
likely cause.
Based on the symptoms and your understanding of
the circult operation, identify one or more possible
causes of the problem.
lsolate The Problem By Testing The Circuit
Make circuit tests to check the diagnosis you made
in step 2. Keep in mind that a logical, simple proce-
dure is the key to efficient troubleshooting. Test for
the most likely cause of failure first. Try to make
tests at points that are easily accessible.
Fix The Problem
Once the specific problem is identified, make the
repair. Be sure to use proper tools and safe proce-
dures.
Make Sure The Circuit Works
Turn on all components in the repaired circuit in all
modes to make sure you've fixed the entire prob-
lem. lf the problem was a blown fuse, be sure to
test all of the circuits on the fuse, Make sure no new
problems turn up and the original problem does not
recur.
3.
Wire Color Codes
The following abbreviations are used to identify wire
colors in the circuit schematics:
wHT ............................. White
YEL ............................... Yellow
BLK ............,.,...............81ack
BLU .............................. Blue
GRN .............................Green
RED .......................,...... Red
ORN ............................. Orange
PNK .............................. Pink
BRN .............................. Brown
GRY .............................. Gray
PUR .,.................,.,........ Purple
LT BLU ......................... Light Blue
LT GRN ........................ Light Green
The wire insulation has one color or one color with
another color stripe. The second color is the stripe.
WHT/BLK
23-5

Troubleshooting
Schematic Symbols
BATTERY
E
@
GROGroLrnd terminal
II_d:
UNDComponent ground
II_..'-
FUSE
--cn-.e
COIL, SOLENOID
r{r
tql'|
CIGARETTE LIGHTER
A
lrl
P
RESISTOR
I
f
VARIAELE RESISTOR
ilH
THERMISTOR
c
IGNITION SWITCH
-fo o.t-
BULB
+
HEATEB
At-l
F
MOTOR
0
PUMP
H
CIRCUIT BREAKER
I
r
Yr
T
HORN
+
DIODE
+
SPEAKER, BUZZER
D
Mast
Y
ANTt:f\,NATRANSISTOR lTrl
II
SWITCH (ln niNormally open
I
/F\t tL I\Y/
I
rrdal positionlNormally closed'*i."n
@
I
LIGHT EMITTINGDIODE ILEDI
A+,
TT
RELAY lln noNormally opon relay
| ....--1'rl*r
til
t "t^f
fmal poaitionlNormally closed relay
ffl-+- |
lrl
lrl
fff
CONDENSER
I
T
CONNTInput
V
I
:CTIONOutput
J
CONNECTOR
*>-
'l!
REED SWITCH
A
tftl
Y

Relay and Gontrol Unit Locations
Dashboard/Door
POWER DOOR LOCI(CONTROL UNIT
AUOIO UNIT(Has built-in keyless receiver circuit)
ABS CONTROL UNIT
23-12

D
Dashboard Wire Harness
Connector ol
Terminal
Numbel of
CavitiesLocationConnects toNotes
c501
c502
c503
c504
c505
c507
c508
c509
c510
c513
c514
c515
c516
c518
c519
c520
20
24
to
12
5
3
20
5
5
14
r0
5
20
22
5
2
5
Behind dashboard lower panel
Above under-dash luse/relay box
Above under dash Iuse/relay box
Above under dash tuse/relay box
Left side of steering wheel
Left side of steering wheel
Below gauges
Behind gauges
Behind gauges
Behind gauges
Behind gauges
Behind gauges
Right side ot gauges
Right side oI gauges
Beh ind middle of dash
Behind middle of dash
Behind middle of dash
Behind middle of dash
Behind middle of dash
Behind middle of dash
Behind gauges
Under-dash {use/relay box (C912)
Main wire harness 1C411)
Floor wire harness (C553)
Main wire harness (C410)
Cruise main switch
Dash lights brightness controller
Junction connector
Gauge assembly
Gauge assembly
Gauge assembly
Gauge assembly
Gauge assembly
Hazard warning switch
Rear window defogger switch
Audio unit (Keyless receiver circuit)
Audio unit
Security control unit
Audio unit
Security system
Accessory power outlet
Gauge assembly
A"r
SRS
A,/r
Optio nal*'
Option al*'
ABS
G501Under middle ol dashBody ground, via dashboard wire harness
*1: With shiit-up indicator or cruise control system ('96 - 97 models)
With cruise control system ('98 model)
c509 C511 c510 c515
13 lc5l7
*2: '96 98 models*3: '99 - 00 models
c508
DASHSOARD WIREHARNESS
c501
c520
c502 c504
23-39