1998 HONDA INTEGRA ZC engine

Integrated Control Unit
Circuit Diagram
Description
An integrated control unit, located in lhe left kick panel, integrates the lunctions of the key-in/seat belt r€minder , side
marker light llasher, wiper/washer, lights-on reminder, rear window delogger timer, brake system light bulb check, and
engine oil pressure indicator flasher circuits.
NOTE: Different wires with the same color have been given a nu mber suflix to distinguish them (for example,
GRN/RED I and GRN/RED' are not the same).
REAR WINDOWDEFOGGERRELAYREAF WINDOWDEFOGGENIND CATORL GHT
f-7
IIBLU/YEL
WHT/ BLK
WHT/ REO
+WHT
WNDSHIELDWIPERiWASHER SWITCH
INT OFF/INT
f7 f7
tltlYEUBLU 8LU/GRN
BLUMHT
J
wtN0sHr€10WIPERMOTOR
UNDER.DASH FUSARETAY BOX
F rmecnlleo counoL ultr
YEUBLU
rYEUBLU
YEUREO YEUREO
tl
IYEURED
LOWENGINEOIIPRESSUREINOICATOBLIGHT
; WINDSHIELD' WIPERMASHERI swlTcH
tf7IVtlYEL
J
FEARwtN00wOEFOGGERSWITCH
WHTIBLU
J
VOTTAGEREGULATOR(ln allernatol)
BLK
G441
ENGINEolLPRESSUREswrTcH
UNDER-NOOO FUSE/RELAY BOX
1.6
:6
t;t-L
i
"'i'- 'i*-
|
I Il
I vi: WINDSHIELO II WASHEB I
L__ "oto: _ __l(*)
n
s
s
,]
23-152
(*) :Wilh combined washer-wiper operalion

Integrated Control Unit
lnput Test (cont'd)
YEL/BLU
View from wire side
'With combined washer-wiper operation
Engine Oil Pressure Indicator Flasher System:
Wire/
No. TerminalTest condition
Key-in/Seat Belt Reminder System:
No. WileTest condition
Testi Desired result
Test: Desired result
Possible cause if result is not obtainsd
Possible cause if fesult is not obtained
*BLK/GRN
1Engine runningCheck for voltage to ground:
There should be battery voltage.
. Faulty charging system. An open in the wire
2YEL/RED
lgnition switch OFFCheck for continuity to ground:
There should be continuity.
. Faulty engine oil pressure switch. An open in the wire
lgnition switch ON (ll)Check indicator light. It the light
does not come on, attach the
YEL/RED terminal to groundl
The light should come on as the
ignition switch is turned ON.
. Blown bulb. An open in the wire
Start the engine.Check tor voltage to ground:
There should be battery voltage
lnsufticient oil
lmproper lubrication
Faulty engine oil pressure switch
1GRN/BLUDriver's door openCheck for continuity to ground:
There should be continuity.
. Faulty driver's door switch. An open in the wire
2
LT GRN/
RED
Front passenger's door
swrlcn open
NOTE: Before testing,
remove No. 43 {7.5 A)
fuse from the under-
hood fuse/relay box.
Check for continuity to ground:
There should be continuity.
. Faulty front passenger's door switch'An open in the wire
3LT BLU
lgnition key inserted
into the ignition switch
Check for voltage to ground:
There should be 1 V or less.
Faulty ignition key switch
Poor ground (G2O1, G401 l
An open in the wire
4RED/BLU
lgnition switch ON (lll
and driver's seat belt
unbuckled
Check for voltage to ground:
There should be 1 V or less.
Faulty seat belt switch
Poor ground (G551l
An open in the wire
NOTE: Refer to page 23-133 for the seat belt switch test.

)
Engine Oil Pressure
Indicator System
Description
NOTE: Refer to page 23-152 for the circuit diagram ofthe engine oil pressure indicator flasher. and to page 23
156 for the input test of the flasher circuit.
The low engine oil pressure indicator light works in twoways. lt will flash continuously following a momentaryloss ol oil pressure, or it will go on and stay on wath a
complete loss of oil pressure.
When the engine first starts, before oil pressure rises
above 29.4 kPa (O.3 kgf/cmr, 4.3 psi), current flows
through the low engine oil pressure indicator light andthe oil pressure switch to ground. This tests the circuit.
With the engine running, voltage is applied to the Ilash-er circuit of the integrated control unit. With normal oilpressure, the oil pressure switch is open and the low en-gine oil pressure indicator light does not operate. lf the
oil pressure switch closes momentarily (more than O.5
seconds). but then opens again, terminal "YEL/RED" will
sense ground through the switch- The integrated con-trol unit will then provide and remove ground tor the low
engine oil pressure indicator light through terminal"YEL/RED". The light will flash on and off untilthe igni
tion switch is turned to "OFF".
lf engine oil pressure talls below 29.4 kPa (O.3 kgf/cmr,
4.3 psi) and does not increase, the oil pressure switchwill stay closed. The low engine oil pressure indicator light
will go on and stay on.
NOTE: Refer to page 23-130 for the engine oil pressure
switch test.
I
23-159

Cruise Control
- Control Unit InputTest(cont'dl
IBLKUnder all conditionsCheck for continuity to ground:
There should be continuity.
. Poor ground (G20l, G401). An open in the wire
2BLK/YEL
lgnition switch ON {ll}Check for voltage to ground:
There should be battery voltage.
. Blown No. l4 (7.5 Alfuse in the
under-dash fuse/relay box. An open in the wire
3LT GRNlgnition switch ON (ll)
and main switch ON
Check for voltage to ground:
There should be battery voltage.
. Faulty main swjtch. An open in the wire
GRY
lgnition switch ON (ll),
main switch ON and
brake pedal pushed,
then released
Check for voltage to ground:
There should be O V with the
pedal pushed and battery
voltage with the pedal released.
. Faulty brake switch. An open in the wire
5GRN/WHT
Brake pedal pushed,
then released
Check for voltage to ground:
There should be battery voltage
with the pedal pushed, and 0 V
with the pedal released.
Blown No. 52 (20 A)fuse in the
under-hood fuse/relay box
Faulty brake switch
An open in the wire
6RED/BLU
lgnition switch ON (ll)Connect to ground: lndicator
light in the gauge assembly
comes on.
Blown bulb
Blown No. 25 (7.5 A)fuse in the
under-dash fuse/relay box
Faulty dimming circuit in the gauge
assembly
An open in the wire
7LT GRN/
BLK
RESUME button
pushed
Check tor voltage to ground:
There should be battery voltage.
Faulty SET/RESUME switch
Faulty cable reel
An open in the wire8LT GRN/
RED
SET button pushed
IPNK
MT/: Clutch pedal
released
A/Tr Shift lever in [2l,
[Dl]. o, [o'l
-
Check for continuity to ground:
There should be continuity.
NOTE: There should be no con-
tinuity when the clutch pedal is
depressed or when the shift
lever is in other positions.
Faulty or misadjusted clutch switch(M/T)
Faulty A/T gear position switch(A/T)
Poor ground (G201,G401)
An open in the wire
't0BLUStart the engine.Check lor voltage to ground:
There should be voltage.
. Faulty ignition system or ECM. An open in the wire
't1ORN
lgnition switch ON (ll)
and main switch ON;
raase the front of the
car, rotate one wheel
slowly.
Check for voltage between the
ORN @ and BLK O terminals:
There should be 0- about
5 V-O- about 5 V repeatedly.
. Faulty vehicle speed sensor {VSS). An open in the wire
BRN/WHTConnect battery power
to the BRN/WHT
terminal and ground to
the BRN/BLK terminal.
Check the sound of the actuator
motor: You should hear the mo-
tor running smoothly.
. Faulty actuator. An open in the wire
BRNi BLK
Connect battery power
to the BRN/RED
Iermrnal.
Check the operation of the mag-
netic clutch: Clutch should click
and output link should be locked.
Faulty actuator
An open in the wire
Poor ground (G30'l)
No. Wire Test conditionTest: Desiled result Possible cause il lesult is not obtained
' 4 I BRN/RED
{
{
23-258
-L

Cruise Gontrol
1.
Actuatol Assembly Test
Disconnect the 4P connector from the actuator.
Check that the output linkage moves smoothly.
Connect battery power to the D terminal and ground
to the A terminal.
ACTUATOR
Check tor a clicking sound from the magnetic clutch.
and that the output linkage is locked. lf the outputlinkage is not locked, replace the actuator assembly.
Check the operation of the actuator moror In eacn
output linkage position according to the table (you
should be able to hear the motor).
FULLY CLOS€D
2.
3.
3.
23-264
Actuator Cable Adjustment
Check that the actuator cable operates smoothly
without binding or sticking.
Start the engine, and warm it up to normal operat-
ing temperature (radiator fans come on twice).
Measure how far the output linkage moves from thefully closed position. Free play should be 11 t 1,5mm (0.43 t 0.06 in).
FREE PLAY:1M.5 mm (0.43 1 0.06 in)
FULLY CLOSED POSITTON
4. lf the free play is not within specs, loosen the lock-
nut, and turn the adjusting nut as required.
NOTE: It necessary, check the throttle cable (see
section 1 1), then recheck the output linkage lreeplay.
5. Retighten the locknut, and recheck the free play.
^ffi"
c17i l,io
Battery
polaritiesOutput linkage
position
ooFULLY
CLOSED
MIDDLE
POSITION
FULLY
OPEN
c
Terminal
B
Terminal
The
moror
runs.
The
molor
runs.
The
motor
stops.
B
Terminal
c
Terminal
The
motor
stops.
The
motor
runs.
The
motor
runs.
{

)
Erasing the DTC Memory
To erase the DTC(S) from the SRS unit, use a Honda
PGM tester (see the Honda PGM Tester SRS vehicle
System Supplement) or the following procedure.
1. Make sure the ignition switch is OFF.
2. Connect the SCS service connector to the MES con-
nector (2P). Do not use a jumper wlre.
MEMORY EMSESIGNAL {MESI CONNESTOR I2P)
[GRN, GBNI or IWHT, BLKI
Turn the ignition switch ON (ll).
The SBS indicator light comes on for about six sec-
onds and goes off. Remove the SCS service connec-
tor from the MES connector (2P) within four seconds
after the SRS indicator light went off.
The SRS indicator light comes on again. Reconnect
the scs service connector to the MES connector
(2P) within the four seconds after the SRS indicator
light comes on.
The SRS indicator light goes off. Remove the SCS
service connector from the MES connector (2P)
within four seconds.
The SRS indicator light indicates that the memory is
erased by blinking two times.
Turn the ignition switch OFF. and wait for ten sec-
onos.
Troubleshootin g Intermittent
Failures
lf the.e was a malfunction, but it doesn't recur, it will be
stored in the memory as an intermittent failure, and the
SRS indicator light comes on,
Atter chocking ths DTC, troubleshoot as follows:
1. Read the DTC (see "Reading the DTC").
2. Erase the DTC memory (see "Erasing the DTC
Memory").
3. With the shift l€ver in neutral, turn the ignition switch
ON (ll), and let the engine idle.
4. The SRS indicator light comes on for about six sec-
onds and then goes off.
I o"* 1--
ONllI
Shake the wire harness and the connector, take a test
drive (quick acceleration, quick braking, cornering),
and turn the steering wheel fully left and righi, and
hold I there for fve to ten s€conds lo 6nd tt|e caus€
of the intermnem farlure
It lhe problem .!curs, lha SRS nd'calor r'ghl will
$aY on.
,l soc or less
Problem recurs, Iight stays on
lf vou can't duplicate the intermittent failure, the sys-
tem is OK at this time.SRS indic.lollight
MESconnaclottarrninlll
CONNECTED
DISCONNECTED
23-289

).1
Contents
How to Use This l\.4anual 1Circuit Schematics (see Circuit Index)Fuse/Relaylnformation 6ComponentLocation Photographs 201
Connector Cavity Numbers 202Connectorldentification 203
Ground-to-Components Index 6-6Wire Harness Routing 203Circuit ldentification lor ln-Line and Fuse Box Connectors
Circuit Index
Air conditionerAir delivery 61Blower controls 60Compressor controls 62Fans 63Anti-lock brake system (ABS) 44A/T gear position indicator 89Automatic transmission controls'98199 models 39'00 models 39-4Back-up lightsHatchback 110Sedan 110- 1Brake system indicator light
USA 71Canada 71-1Brake lightsHatchback 110-6Sedan 110-7Cargo area light (Hatchback) 114-3Ceiling light 114-2Charging system 22Cigarette lighter 155
Clock 154Condenser fan 63Console lights 114Cruise control 34Dash lights 1 14Daytime running lights 110-8Door open indicator 114-2Engine coolant temperature gauge 81Engine oil pressure indicator light 72Fog lights 110-14Front parking lights 110-11Front side marker lights 110-11Fuel gauge 81Fuse/relay boxUnder-dash 6Under-hood 6-3Under-hood ABS 6-5Gauges 81Glove box light 114Ground distribution 14Ground-to-Componentsindex 6-6Hatch open indicator '114-3
Hatch opener '134
Hazard warning lightsHatchback 'l l0-2Sedan 110-4Headlights 1'10-8Headlight switch 100HeaterAir delivery 61Blower controls 60Fanswith A,/C 63without A,/C 63-2Horns 40lgnilion key reminder 73lgnition system 20
204
lmmobilizer system ('00 model) 132lndicators 80Integrated control unit 70Interlock system'98199 models 138'00 models 138-1License plate lightsHatchback 110-12Sedan 110-13Lights-on reminder 73Low fuel indicator light 74l\,4aintenance reminder light 83l\iloonroof 122Odometer 81-1Power antenna 151Power distributionBattery to ignilion switch, fuses, and relays
Fuses to relays and components 10-2Power door locksHatchback '130
Sedan 130-2Power mirrorsHatchback 141Sedan 141-1Power windowsHatchback 120Sedan 120-2Programmed fuel injection system (PGM-Fl)'98199 models 23'00 models 24Radiator fanwith tuC 63without A,/C 63-2Rear parking lightsHatchback 110-12Sedan 110- 13Rear window defogger 64Seat belt reminder 73Security system 133Speedometer Il-1Spotlights 114-2Starting syslemAutomalictransmission 21l\.4anualtransmission 21-1Stereo sound system 150Supplemental restraint system (SRS) 47Tachometer 81- 1TaillightsHatchback 110-12Sedan 110-13Trailer lighting conneclor 118Trunk lid open indicator 114-3Trunk light (Sedan) 114-3Turn signal lightsHatchback 110-2Sedan 110-4Vehicle speed sensor (VSS) 33Wiper/washerFront 91Rear 92
10
).1
I
Xr
12Fg oAmerican Honda Motor Co., Inc. - All Rights Reserved Service Communications 275 pages

How To Use This Manual
Component Locations
To see where a component or connector is located on the car, look up its photo number in the
Component Location section in the back of the book. The photo will also tell you the color of
the connector. and how manv cavities it has.
VEHICLESPEEDSENSOR (VSS)
ENGINECONTROLUNIT (ECMPHOIO 8A
0,, I
tl
tl
'r"'
To see where
connectors and parts
are located, look up
their photos in the
Component
Location section.
r -.I GAUGE
| | ASSEMBLY I
rtlL-J L-
r -'l
ll
ll
O,(
ot(
il"l,*.I CRUISE
I CoNTROL
i"u,t',:..
lf there is no photo number below or beside a connector, ground, or terminal number, look up
that connector, ground, or terminal number in the appropriate Connector ldentification Chart.
The chart will tell you the color of a connector, how many cavities it has, where it's located,
and what component or harness it connects to. On the page opposite that chart you'll find an
illustration of the related harness.
Connector ld6nlillcallon and Wire Harness Rouling tconrd)
SEAT WIFEHAFNESS
c712lf a connector on a
schematic has no
photo number, look it
up in the Connector
ldentification chart.
c297
203-15203-14
t-