1998 HONDA INTEGRA service

- How the Circuit Works
The low engine oil pressure indicator light works in
two ways: il flashes continuously following a
momentary loss of engine oil pressure, or it comes
on and stays on with a complete loss of engine oil
oressure,
When the engine first starts, before its oil pressure
rises above 4.3 psi, voltage is applied to the closed
and grounded engine oil pressure switch and the
light comes on to test the bulb.
With the engine running, voltage is applied at the
WHT/BLU wire of the integrated control unit. With
normal engine oil pressure, the engine oil pressure
switch is open and the low oil pressure indicator
light does not come on. lf the engine oil pressure
switch closes momentarily (more than 0.5 seconds)
but then opens again, the YEURED wire at the
integrated control unit will sense ground through the
switch. The integrated control unit will then provide
and remove ground for the low oil pressure indicator
light through the YEURED wire. The light will flash
on and off until you turn the ignition switch off. The
flashing feature will not work until 30 seconds after
initial voltage is applied to the WHT/BLU wire of the
oil pressure indrcator llasher circuit. This delay
keeps the low oil pressure indicator light from
coming on during engine warm-up.
lf engine oil pressure falls below 4.3 psi and does
not increase, the engine oil pressure switch will stay
closed. The low oil pressure indicator light will then
come on and stay on.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
72-1

- How the Circuit Works
Do not smoke while working on the fuel system.
Keep open flame away from 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 is warm, its resistance
decreases. Fuel in the fuel tank transfers heat away
from the thermislor last enough to keep it cool so
the thermistor's resistance stays high and the low
fuel indicator lighl does not come on. When the fuel
level drops below about 2.2 gallons, the thermistor
is no longer immersed in fuel. Without the fuel to
cool it, the thermistor's resistance decreases,
allowing current to flow through the low fuel
indicator light and the thermistor to ground, and lhe
low fuel indicator light comes on.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
74-1

Gauges (cont'd)
- How the Circuit 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 speedometer drive circuits
receive pulses lrom 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 ('98-'99 Models)
The tachometer drive circuit receives oulses from
the ignition control module (lCM) in the distributor
assembly. The solid-state tachometer then displays
these pulses as engine speed. For each 200 pulses
per minute from the ignition control module (lCM),
the tachometer displays 100 RPM.
Tachometer ('00 Model)
The tachometer drive circuit receives pulses f rom
the PCM or ECM. The solid-state tachometer then
displays these pulses as engine speed. For each
200 oulses oer minute trom the PCM or ECM the
tachometer displays 1 00 RPM.
Engine Coolant Temperature Gauge and Fuel
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 field. The magnetic
field, controlled by the engine coolant temperature
gauge 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 tield. The fuel gauge
works the same way.
The engine coolant temperature gauge sending
unit's resistance varies from about 137 ohms at low
engine temperature to between 30-46 ohms at high
temperature (radiator fan running).
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 to LOCK (0), the
gauge remains at the last reading until you turn lhe
ignition switch to ON (ll) or START (lll) again.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
81'2

How the Circuit Works
The maintenance reminder light comes on to
remind the driver that the car is due for
scheduled mainlenance.
The maintenance reminder unit receives a vehicle
speed input from the vehicle speed sensor (VSS)
and uses this inlormation to compute the distance
traveled. For the first 6000 t 1 00 miles (9650 t 160
km) after the maintenance reminder light is reset, it
will come on for two seconds when you turn the
ignition switch to ON (ll) as a bulb check.
Between 6000 1 100 miles (9650 t 160 km) and
7500 t 100 miles (12070 I 160 km) the reminder
light will come on for two seconds when you turn
the ignition switch to ON (ll), and then flash for eight
seconds more.
Beyond 7500 t 100 miles (12070 t l60 km) the
reminder light will stay on when the ignition switch is
in the ON (ll) position until the unit is reset.
To reset the unit, the car must be parked and the
ignition switch in the ON (ll) position. Press the
reset button on the unit and hold it there for more
than three seconds, and the reminder light will
go off.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
83-1

- 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, ils indicator
light comes on. lf you se,ecl B, tor example, ground
will be applied to the input of the A,/T gear position
indicator, and the R indicator bulb 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 lixed
to controlled by the dash lights dimmer inpul
through the RED wire.
When the lransmission ('98.99 models) or
powertrain ('00 model) control module (TCM or
PCM) detects an abnormality in the automatic
transmission control system, or when you request
diagnostic trouble codes through the service
check connector, the TCM or PCM will make lhe D4
indicator light blink.
Refer to the Service Manual (Section 14,
Automatic Transmission) for soecific tests or
troubleshooting procedures.
89-1

Wiperffasher (contd)
- How the Circuit Works
When the ignition switch is in ON (ll) or START (lll),
battery voltage is applied to lhe windshield
wiper/washer switch, and the windshield wiper
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 wiper
switch at G401, and the wipers run at low speed.
ParUOfi
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 ol the windshield wiper motor are
grounded through the BLUI/EL 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 (lntermittenvPark 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 returns 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.
91-2
Mist
When you pull the wiper switch down to MIST
position, the high speed windings of the wiper motor
are grounded through the BLU//EL wire and the
closed contacts of the mist switch at G401, and the
wipers make one pass across the windshield at high
speed. The PABKOFF tunction then takes over and
the wrpers stop in the PARK position.
Washer
When you pull the wiper switch toward you to turn on
the washer switch, battery voltage is applied to the
washer motor. The motor pumps fluid onto the
windshield until you release the lever. On models
with combined wiper/washer operation (Canada), the
integrated control unit (windshield washer ON input)
senses power al the BLI(GRN wire terminal and
runs the washer motor whenever the wioers run.
Reter to the Service irlanual (Section 23, Electrical)
for specific tests or troubleshooting procedures.

Headlights (cont'd)
- How the Circuit Works
Low Beam OperationRefer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
With the headlight switch in HEAD and the dimmer
switch in LO, current flows through the headlight
switch, fuse 21 , tuse 22, and the low beam
filaments to ground, and the low beams come on.
tligh Beam Operation
With the headlight switch in HEAD and the dimmer
switch in Hl, current flows through the headlight
switch, dimmer/passing switch, fuses 4, 5, 21, and
22, and the low and high beam filaments to ground,
and the low and high beams come on.
Current also tlows through the high beam indicator
light to ground. The high beam indicator comes on
to remind the driver that the high beams are on.
Flash operation
The flash feature works with the headlight switch in
OFF, PARK, or HEAD (low beams). When you
move the flash-to-pass switch to ON, current flows
through the switch, fuses 4 and 5, and the high
beam filaments to ground, and the high beams
flash. The high beam indicator also flashes during
the flash oDeration. The flash function has no effect
it the high beams are already on.
Daytime Running Lights Day Operation
When you turn the ignition to ON (ll) with the
parking brake released, the daytime running lights
control unit supplies battery voltage at the
WHT/RED wire. This voltage is applied to the high
beam headlights through the daytime running lights
resistor. Each high beam headlight receives less
than battery voltage causing them to come on al
reduced brightness.
lf the parking brake is set, a ground signal is applied
to the daytime running lights control unit at the
RED/GRN wire. It the parking brake is set when you
first turn the ignition switch to ON (ll), the high beam
headlights will remain off until you release the
parking brake. Once the high beam headlights are
in day mode, setting the parking brake will not
cause the headlights to turn off . When low or high
beam operation is requested, baftery voltage trom
the headlight switch is applied to the daytime
running light control unit via the RED/vVHT wire.
The daytime running light control unit then
discontinues the daytime running light mode.
1 10-10

Power Windows (conrd)
- How the Circuit Works
CAUTION: You could iniure your arms, hands,
or fingers if you unintentionally switch the
driver's window to "automatic down,' while
working in that door with the power on. Discon-
nect the window switch connector or the battery
when working in the driver's door.
System Description
The operation of the power windows is controlled by
the main switch in the power window masler switch.
When the main switch is in OFF, only the driver's
door window can be opened or closed. With the main
switch ON, all windows can be opened or closed
either by switches in the master panel, or switches in
the doors. The driver's window switch also has an
automatic down mode which is tumed on by pushing
the switch down to its second position.
The power windows are driven by reversible motors.
Each motor is protected by a built-in circuit breaker.
lf the window switch is held on too long (with the
window obstructed, or after the window is fully up or
down), the circuit breaker opens the circuit. The
circuit breaker resels automaticallV as it cools.
Driver's Window
With the ignition switch in ON (tt), vottage isprovided to the coil ol the power window relay
through fuse 24. The contacts of the power window
relay close, and voltage is applied to the driver's
switch. When you push the power window master
switch to Uq voltage is applied to the driver's power
window motor. (The motor's ground path is backthrough the power window master switch.) The
driver's window motor then drives the window uo.
When you push the switch to DOWN, voltage ls
applied in the opposite direction and the motor
drives the window down.
Automatic Down (Driver's Window)
With the ignition switch in ON (tl), vottage is applied
to the coil of the power window relay. The contacts
of the power window relay close and voltage is
applied to the power window master switch. When
you push the driver's switch to the AUTO DOWN
position, voltage is applied through the drivels
switch to the driver's window motor. The control unit
receives pulses at the pulser input while the motor
is running. When the window is fully down, the
motor stops, and pulses are no longer generated by
the pulser. This is sensed by the control unit at thepulsBr input, and voltage is no longer applied to the
driver's window motor.
Passenger Windows
With the ignition switch in ON (tt), vottage is apptied
to the coil of the power window relay through fuse
24. The contacts of the power window relay then
close, applying voltage to the individual window
switches and the power window master switch. With
the master panel main switch ON, the passenger
windows can be operated from the individual
window switches or from the master Danel switches.
When you push the front passenger's window
switch to UR voltage is applied to the front
passenger's window motor. (The motor is grounded
through the contacts in the front passenger's window
switch and the power window master switch.) The
wndow moves up as long as you hold the switch in
lhe UP position. lf you push the switch to DOWN,
voltage is applied in the opposite direction io the
front passenger's window motor, and the window
moves down as long as you hold the switch in the
DOWN position. The window switches in the other
doors operate similarly.
When you push the front passenger's switch in the
master panel to UP, voltage is applied through the
front passengeas window switch contacts to the
front passenger's window motor (The motor is
grounded through the contacts in the front
passenger's window switch and the power window
master switch.) The window moves up as long asyou hold the switch in the UP position. lf you push
the switch to DOWN, voltage is applied in the
opposite direction to the front passenger's window
motor, and the window moves down as long as you
hold the switch in the DOWN position. The otherpassenger window switches in the master panel
operate similarly.
Refer to the Service Manual (Section 23, Electrical)
for specific tests or troubleshooting procedures.
120-6