2002 HONDA CIVIC Keyles

ISystem Descriptions
The Multiplex Control System has four internal
functions:. Multiplexing (send multiple signals over sharedwtres). Wake up/sleep (runs at full power only on demand toreduce battery draw). Fail-safe (fixes or ignores faulty signals). Self-diagnosis (Mode 1 for the system, Mode 2 for
input lines)
The system controls the function of these circuits:. Entry lightcontrol (ignition key lightandceiting light). Wiper/washer intermittent wipe and park functions. Keyless/power door lock. Meter assembly, temperature gauge, and indicator
lights. HVAC (compressor and fan control). Key-in reminder. Headlight reminder. Seatbelt reminder
JI
/ar
22-171
Multiplex Communication
To reduce the number of wire harnesses, digital signals
are sent via shared multiplex communication linesrather than sending normal electrical signals throughindividual wires.. The input signals from each switch are converted todigital signals at the central processing unit (CpU).. The digital signalsaresentfromthetransmitting unitto the receiving unit as serial signals.. The transmitted signal is converted to a switch signalat the receiving unit, and it operates the related
component or monitors a swltch.. There are exclusive communicalion lines between
the ECM, the gauge assembly, and the under,dash
fuse/relay box.
Wake-up and Sleep
The multiplex control system has "wake-up" and"sleep" functions to decrease parasitic draw on the
battery when the ignition switch is OFF.. ln the sleep mode, the multiplex control unit stops
functioning (communication and CPU control) when it
is not necessary for the system to operate.. As soon as any operation is requested (for example, adoor is unlocked), the related control unit in the sleep
mode immediately wakes up and begins to function.. When the ignition switch is turned OFF, and the
driver's or front passenger's door is opened, then
closed, there is about a 10 second delay before the
control unit goes from the wake-up mode to the sleepmode.. lf any door is open, the sleep mode will not function.. lf a key is in the ignition switch, the sleep mode will
not function.. When in sleep mode, the draw is reduced from
70 80 mA to less than 10 mA.
Fail-safe
To prevent improper operation, the multiplex controlsystem has a fail-safe function. In the fail-safe mode,
the output signal js fixed when any part of the systemmalfunctions (for example a faulty control unit orcommunication line).
Each control unit has a hardware fail-safe function thatfixes the output signal when there is any CPUmalfunction, and a software fail-safe function thatignores the signal from the malfunctioning control unitand allows the system to operate normally.

Service Manual Index
(cont'dl
Gauge A3semblyReplacement......................................... 22 64
Gaug€sComponent Location Index ..........-...... 22 54How-to lnformation ........................22-56Circuit Diagram22-54
Heater Valve CableAdjustment ...................... .................... ?1-46
High Mount Brake Light8ep|acement......................................... 22 82
Hood
lmmobilizer SystemComponent Location In dex .............. 22-162
\
G
Description
Genoral Information(See seclion 1)
Glove BoxRemoval/1nsta11ation .......................-.... 20-63
GrilleReplacement...........-............................. 20-94
Hood lnsulatorReplacement......................................... 20-89
Hood LatchRep1acement................... ..........20 108
Hood Opener CableComponentLocation Index ..............20 105Replacement ................ . . ........... .....20 106
Hood SealBeplacement.-...........................-........... 20-88
HornTesVReplacement . . ................ ...... 22-122
CircuitDiagram ...........................22-164Troubleshooting ............................ 22,165
Inner Fender, FronlRepf acemenl....................................... 20-102
Inside Rearview MirrorReplacement..........-.............................. 20 16
Instrument PanelRemoval/1nsta11ation................. ....... 20-59
Intake Air Bypass ControlThermal ValveTesr................................ ..... ..11-161
Intake Air SystemComponent Location Index ...-.-........ 11-159
Intake ManitoldRemoval/1nsta11ation ................................ I 2
lntermediate Shaft AssemblyRemova1 ................-.-...-......................... 16-19Disassemb|y................... ... ......-.... 16,20Resassemb|y ........................................ 16 22Installation .........-...-.............................. 16-24
Keyless Entry Transmitter
Adjuslment
H
Adiustment .......
Hatch Handle
Horn SwitchTest ............-........
HornsComponent Location IndexCirc!it Diagram
H02S. SecondaryReplacement
..............22-120Replacement
22-122
22 12120-110
20-'110Hatch LatchReplacement$
K
Hatch Latch Switch
.... 11 113
HubsReplacement. ... .................................. 1A 26Test
Test
Replacement
Hatch Support StrutsBeplacement.....
Hatch WeatherstrioReplacement....
Hazard Warning Switchtest
ldle ControlSystemComponentLocation Index .............. 11-129Inspection,.,.........-.......,.,.,,,,,,.,,,.,.,..... 1'l 138
lgnition CoillslBemoval/lnstallation ...............-.............. 4 18
22-161Test ...................................................... 22 161
Keyless Entry/Security Alarm SystemComponenl Location Index .............. 22 150Circuil Diagram ................. . .............. 22 151
Keyless Receiver Unitlnput Test ............................................ 22-153
Knock SensorReplacement......-................................ 1 1 115
KnucklesReplacementFront Suspensron ............................. 18-1 1Rear Suspension ........ .................-... 18-28
Repair ...............
H.tch Lock Actuator22-159
Hatch Lock CylinderRep|acement....................................... 20,111
Hatch SpoilerIAT {lntake Air Temperature} SensorReplacement.,.........-...'11 115
20-91
20-92
.................... 22_88lgnition Key LightTest,,.,,,,.,...,......-.
H6adlightAdjustmentlgnition Key Switch
....................... 22-91
....................... 22-91..22-78TestReQ\ace$entlgnition SwitchTest .,,,.,.,.,,,,.,.,.......22-53License Plate LightReplacement...........-... - ... .....22-83
License TrimReplacement..................-...-..........-....... 20-98
Lights, ExteriorComponent Localion Index.................22 68
Lights,InteriorComponent Location Index................. 22-94CircuitDiagram .. .. ...... .... 22-95
HcadlightsCircuit Diagram .............................. 22-71, 72
HeadlinerRemoval/lnstallalion ............................ 20-54
Heater ControlPanelRemoval/1nsta11ation ............................ 21-38
Heater Control Power and Ground CircuitsTroubfeshooting......... .......................21-27
lgnition SystemComponent Location Index ................... 4-15CircuitDia9ram .................................... 4'161nspection ............................................... 4-17
lmmobilizer Control Unit-Receiver
J
22-161

)
Low Fuel lndicatorTest.....................11-158Moonroof Drain Channel SliderReplacement......................................... 20'44
Moonroof FrameRep1acement,,,,,,,,,,.,.,.,.,.,.,.,,,,,,............ 20 42
MoonroolGlassAdiustment ........................................... 20-37Rep1acement......................................... 20 37
Moonroot Limit SwitchAdjustment ........................................-.- 20 46Test ...................................................... 22 113
Moonrool MotorReplacement....-.................................... 2D-41
Oil Pressure SwitchTest ................-.-........-................................ 8-4Replacement.........-................................. 8-16
Oil Pump, EngineOverhau1 ................................................... 8-8
Oil, EngineReplacement...-................-.-...................... 8-5
OPDS UnitReplacement....................................... 23- 124
Outside Mirror HoldersBeplacement......................................... 20-15
Outside Power Mirror ActuatorsTest ...................................................... 22-117Bepf acement..-.................................... 22-1 14
Outside Power Mirror SwitchTest ..-................................................... 22-111
Outsid€ Power MirrorsReplacement............................ ... .. . . . 20-15Component Location lndex .............. 22- 114Circuit Diagram .................................. 22-115Test -..................................................... 22-116
Lower ArmsRemoval/1nsta11ation............................ 18 19
Lubrication SystemComponent Location Index..................... 8-3Test............................................................ 8 4
M
M/TAssemblyRemoval.......... 13-4 Test...................... 22-1 12lnstallation............. 13-8
.........21,35
Disassembly ......................................... 13-14Resassembly .. ... ................. 13-46
M/TChange Leverlnspection ............................................. 13-19Disassembly 8eassemb1y ................... 13-20
M/T Countershaft AssemblyInspection ....................................... 13 31, 33Disassemb1y ......................................... 13-32Resassemb|y ........................................ 13-34
M/T DifferentialComponentLocation Index................. 13-52Adiuslment ........................................... 13-56
M/T Maifthaft Assembly1nspection ... ................................... 13-23, 26Disassembly ......................................... 13 25Resassembly ........................................ 13 28Adjustment ........................................... 13-43
M/T Reverse Shift ForkInspection .................... ........................ l3 19
M/T Shift LevelReplacement......................................... 13-51
Mainshaft BearingsReplacement....,.................................... 13 41
MairtenancelSee section 3)
MILHow to Informatron ............................. 1 1.46
MIL CircuitTroubleshooting .......... .- . . . . ......... 11 97
MirrorsComponentLocation Index................. 20'14
Mode Control MotorReplacement
Moonrool SunshadeRep1acement....................... . . ............. 20 40
Moonroof SwitchTesVRep1acement .............................. 22- l 12
Mooniool Wind Def lectorReplacement.......................-................. 20-38
Moonroof/SunroofComponent Location Index ... 20-35, 22-108Test ........................................................ 20-48Cf rcuit Diagram .................................. 22- 109
MTFInspection/Rep1acement. .......... ........... 13-3
Muhiplex Control SystemComponentLocation lndex ..............22 168Circuit Diagram .................................. 22-1690escription ......................................... 22-17 1Troubleshooting ................................ 22-17 2
Muliiplex Control Unit, Under-dashInput TestEntry Light Control Sysiem ............. 22-92Keyless Entry/Security AlarmSystern .-....................................... 22-155MultiplexControl System .............22 115Wiper/Washer................................. 22'1 41
NoiseTest,,Reduction Condenser
Parking ErakeInspection Adjustment ........... .............. 19-7
Parking Brake CableRep1acement......................................... 19-26
Parking Erake Switch
P
l
Test ...................... 19-10
Test............................... . ...........2135
Moonroof Auto Stop SwitchosTest ...................................................... 22'113
Moon.oot Control Unillnput Test ............................................ 22-110
Moonroof Drein ChannelBeplacement ... . ....... ......................... 20 39
Oil Filte]Replacement............................................. 8-6
Oil Filter Feed PipeReplacement............... . ..-,...,.,,,,,,,,8-7
Oil PanRemoval .............,.,,,,,,,,,,,,.,.,,,.........-....... 7 1 1lnstallation .............................................. 7 -27
Passenger's TraVRemoval/lnstallation ............................ 20-65
PCV ValveBeplacement....................................... 1 1'169Test........................................... l1 169
Piston Rings8ep1acement................................-.-...-.- 7-21
PistonsReplacement...................-....................... 7-181nsta|1ation ...................................... ...1-23
Power R€layTest ...............-.-...................................... 22-51
Power Window Motor, Driver'stesl.....,,,, .,.,,,............
Power Window Motors, Passenger's
Power Window Switch, Masterlnput Test ..........-.........-....................... 22-126Tesr ....... . ............................................ 22 124Replacement....................................... 22-133
N
..............22 101
o
l' ,e
(cont'd)