1999 HONDA CIVIC ect

A/T Controls ('99-'00 CVT)
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im-i[[r:
| | Pase 1G5 lLJ-------J*"''n* tr' F&i'?;,,,,n^,oF---+**lI
UNDER-HOODFUSE/RELAYBOX
S€9 PowerOistribution,page 1G1 1.
S€e Pow€tOistribulion,page 1G13.
13 Y C421aza4,PHOTO 63vlEw 5a
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S€e PowerDislribution,pag€ t$s,
10 v cl31PHOTO A5vtEw 59
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I Bstt€ry input Brake switch pow€r sourc€ |
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I connector slc€€d speed senior speed iens6r gearshaft -speed tI inpg! inp{ input input s€nsor input ,
LJTS---Sl----g?:t--__..it:t'__-__5'r___ _______J'
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39-12
3 ctor

Horn
- '96-'97 Models
UNDER.HOODFUSE/RELAYBOX
c353PHOTOs
See PowerOistribution,pag610-13.""^T.!,-
HORNRELAYPHA|O 58
c214
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BLU/FEO
1
VHT/qRN
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WHT/qRN
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HORN
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h: c4o1PHQ|A 57
c430
Sse CruiseControl
Vehicles pre-wired ---lor accessorysecurity system
BLU
GBY
------- J
- -.! STEERINGWHEEL
6 g c411
| _vtEw 60
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18 A C516
sEcuRtwSYSTEMCONNECTOR(oPTroN)PHO|O 73VEW 5A
40

UNDER-HOODABS FUSE/RELAY BOX
r------1
c356
FUSE 63MTNCHECK7.54
c357 2
FUSE 61PUIiPolon
c356
ABSPUMPMOTOR
i-.t_____l
*fitr
3
YEURED
A19
(PMR) (MCK) IPump Motor Icomm6n motdr check IRight rear ABS LeftftontABS ;i; !
solenoid control solenoid controt loni of !
\^li Service.check DLC I
/ connector input inpuvoltput i&------ ---_____J
11.I A14 r aBs coNrRor_lrNrBRN I rr eru I LT BLU vttt 63trrt sRS. ATcontrols t-! vccvnv 1"Tl 'Tl ':c360
SERVICE DATA LINKCHECK CONNECTORCONNECTOR (DLC)PHoIo 83 See GrOUnd pHOrO so
Pll'lo.,jpn. p y:l:!:1
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RightRearABSSolenold(Out)
nightReerABSSoloroid(ln)
LettFrontABSSolenoid(od)
PHA|A 125 PHOfO,/
44-1

- How the Circuit Works
The anti-lock brake system (ABS) prevents locking
of the wheels as a result of heavy braking and/or
poor lraction. A vehicle with locked wheels cannot
be steered. The anti-lock brake system controls the
application of the brakes, allowing the driver to
maintain control of the steering.
Under anti-lock conditions, the antilock brake
system (ABS) modulates the pressure of the brake
tluid to each brake caliper. This system is a four
channel system: the pressure at each caliper is
controlled independently of the pressure al any
other caliper. Whenever a wheel is likely to lock
dunng braking, the anti-lock brake system
modulates the brake oressure at that wheel. When
the brake pressure is reduced to the point where
there is no longer any possibility of wheel locking,
the system returns to the conventional braking
system mode of operation.
Battery voltage is applied at all times through fuse
63 to the ABS control unit. When the ignition switch
is in ON (ll), battery voltage is supplied to the
control unit through fuse 16. The control unit is case
grounded. Inputs are received from the brake switch
and the individual wheel sensors located at each
wheel. The ABS control unit uses these inputs to
control the modulator solenoid unit. The solenoids
adjust the hydraulic pressure applied to each
calioer.
The ABS control unit has a self-diagnosis function.
When the control unit detects a fault, it turns on the"ABS" indicator and disables the anti-lock brake
system. lf the fault is not in the conventional braking
system, the brakes will continue to operate normally
but without the anti-lock feature.
Refer to the Service Manual (Section '19,
Anti-Lock Brake System) for specific tests or
troubleshooting procedures.
44-3

Supplemental Restraint System (SRS)
(
FUSE 13FUELPUUPFBA UMT)15A
See PowerDistibution,page 10-2.
FUSE 23(sRs)
c801PHOTO 58
SRS MEMORY ERASESTGNAL (MES) CONNECTORPHO|O 111
. To avoid accidental deployment and possible
iniury always disconnect the driver's airbag and
f ront passenger's airbag connectors (automatically
shorted) before working near any SRS wiring.
. CAUTION: Whenever the ignition switch is ON (tt),
or has been turned OFF for less than three minutes,
be caretul not to bump the SRS unit; the airbags
could accidentally deploy and cause damage or
iniuries.
UNDER-DASHFUSE/RELAYBOX
GFY 07)or GFN{18)
GFN
GFYt2l
GFN
GRY0)
GFN
2
ALK
J (ii
t\
GFY O4)or GRN
SRSUNIT
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iffii'r:fi:*" i tH-
PHOIO 125short contact) | - FCqOtL_________J PHO|A 57
47
GAY (21) or GRN
lgnitionInput(VA)
Driver's
cont.ol
lgnitioninput(VB)MES connector inputSRS indicatorlighl control
Service t------check : Passengefs ;connector ; airbag control , GroundInpu , /+rr I pir-r
Passenger'sai|bag conlrol; prc..t rnpuv, Ourpul
14GRY(5) orGFN
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- How the Circuit Works
'96198 Models
The air delivery system directs the flow of air used
by the heater and air conditioner systems.
Mode Selection
Mode selection is controlled by the mode switches
in the heater control panel and the mode control
motor. When you select a specific mode, voltage is
applied through the dimming circuit to the LED,
which comes on, indicating the mode selected.
Ground is orovided to the mode control motor
though that mode switch. The motor then runs until
the air control door reaches the proper position.
Fresh/Recirculation 56lection
When you press the fresh or recirculation button, a
ground signal is sent from the heater control panel
to the recirculation control motor. The motor then
runs until the recirculation door reaches the proper
position. Battery voltage is also applied through the
dimming circuit to the corresponding LED, and the
LED comes on.
Refer to the Service Manual (Section 21, Heater) for
specitic tests or troubleshooting proc€dures.
'99J00 Models
The heater control panel receives battery voltage at
all times through fuse 47. With the ignition switch in
ON (ll), voltage is supplied to the heater control
panel through fuse 17. The control panel is
grounded at G402.
The heater control panel controls the air delivery
motors, and supplies a 5 VDC reterence voltage to
the air mixture control motor.
The air mixture and mode control motors each
receive inputs trom the heater control panel. The air
mix motor regulates the mixture of cold and hot air
by varying the position of the heater-evaporator doot
The mode control motor controls the direction and
volume of outlet air. The air flow can be directed to
the dashboard vents or the corner vents.
Both the air mixture control molor and mode control
motor are grounded by the h€aler control panel.
The recirculation control motor receives battery
voltage through fuso 17 when the ignition swilch is
in ON (ll). lt regulates the position of the fresh/recirc
door, and is controlled by two position inputs from
the heater control panel ("Recirc" and "Fresh").
Refer to the Service Manual (Section 21, Heater) tor
specific tests or troubleshooting procedures.
61-3

A/C Compressor Controls
- AllModels
cc5)M7
BLU/RED
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&cCOMPRESSORCLUTCHRELAYPHOfO 10
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I A/C request ! (pCM or ECM)I (ACSJ a pHOrO a6L------J vtEw 70
REO
BEO
1
RED
BLU/FEO
2
BLU/FEO
ct31
:"1'!i'------;
Fi:rz, a ='e6-'s8: A|| moders except D1685vtEw 21 '99100: D16Y5 with l\illT'* = 96-'98: All models
ir'iio ," 99. 00: Dt6y5 wth t\4/t Dl6Bb
atcPRESSUREswtTcH
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To facing page ('96''98 models)or page 62'2 ( 99-'00 models).
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A,/CCOMPRESSORCLUTCH
COMPRESSORTHERMALPROTECTOR
UNDER-HOODFUSE/RELAYBOXf-T-*-'.T'---l H53.',EPA?' i-l-------
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pase 1o-1.
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62
!(on bracket)

- 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