MITSUBISHI ECLIPSE 1991 Service Manual

BODY - Troubleshootina234 7AUTOMATIC
SEAT BELT <Vehicles for U.S. >N23EBGD
CIRCUIT DIAGRAM
IGNSW1
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3-BW
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COMBINATION
METER2
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WHEN KE
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AUTOMATIC
SEAT BELT
CONTROL UNIT
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23-18BODY - Troubleshooting
AUTOMATIC SEAT BELT
SUB FUSIBLE LINK QCONTROL UNITIE-41
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AUTOMATIC SEIBELT MOTOR R
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(RIGHT SIDE)
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SIDE) AUTOMATIC SEAT BELTE-07CONTROL UNIT
E-41
AUTOMATIC SEAT BELTCONTROL UNITE-41
&- Remark=*The connectqr,indicated,QYthe x SYmbOl is aPPIicat)le to
vehicles with ABS.

BODY - Troubleshootinn2349Trouble symptom
Driver’s and/or
front passenger’s
system does not
function
CauseFuse blown or disconnected
Open harness wire or
disconnected connectorCheck methodRemedyCheck fuse
@IReplace or reconnectthe fuse
Check using check charts No. 1, 3 and 5
Defective switch
Defective motor
Defective relay
Defective control unit
Defective driving deviceCheck using check chart No. 5
Check using check chart No. 3
Check using check chart No. 3
-Replace the control unit
-Replace the driving
device assemblyWarning light
does notlluminate or
flashFuse blown or disconnected
Open harness wire or
disconnected connectorCheck fuse
@IReplace or reconnectthe fuse
Check using check charts No. 1, 2, 4 and 5
Defective switch
Warning light bulb blown
or in poor contactCheck using check charts No. 2, 4 and 5
Check using check chart No. 2
3uzzer does notsoundDefective control unit
Fuse blown or disconnected
Defective buzzer
-Check fuse @
Refer to Inspection
section
(P.23-97.)Replace the control unit
Replace or reconnectthe fuse
Replace the buzzerOpen harness wire or
disconnected connectorCheck using check chart No. 2
Defective control unit
-Replace the control unit
The slide anchorDefective driving device,Try to move the slideIf the slide anchor does
foes not move fromor problem in electricalanchor in both directionsnot move:
he “fasten” rangecircuitby hand
Replace the drivingnto “release”device assemblyange, or from the
‘release”range intoIf the slide anchor moves:
he “fasten” rangeCheck using check
charts No. 1, 2, 3
and 5
Glide anchor moves
00 slowly
Slide anchor stopsralfwayForeign matter in guide rail
Defective retractor
(remains in locked state)
-Clean or replace the
driving device assembly
Check retractor operation
Replace the retractorwhen both pulling out(for shoulder belt)and retracting belt
Defective driving deviceTry to move the slide
or problem in electricalanchor in both directions
circuit
by handIf the slide anchor does
not move:
Replace the driving
device assemblyIf the slide anchor moves:
Check using check
charts No. 1, 3 and 5

23-20BODY - Troubleshooting
CHECKING CIRCUITIndex of Check Chart
Chart No.Circuit name
1Control unit power supply and ground circuit
2Warning light, key reminder switch, buzzer circuit
3Release switch (driver’s side), buckle switch, outer switch circuit
4Door latch switch, fasten switch, release switch (passenger’s side) circuit
5Motor power supply and drive circuit
1. Control Unit Power Supply and Ground Circuit
Page No.
23-20
23-2 1
23-23
23-25
23-28IGNITION
SWITCH
,\--AUTOMATIC
SEAT BELT
CONTROL UNIT
Step
1
2
3Check method
Operation
Unplug the
connector from
the control unit
Ignition switch:
ONignition switch:
OFFCheck object
Harness side
terminal voltage
of control unit
connector
(I 1 -Ground)
Harness side
terminal voltage
of control unit
connector
(1 -Ground)
Terminal-to-ground continuity
of control unit
harness side
connector
(7-Ground,17-Ground)
TJudgement
NormalMalfunction
System voltage0 VCauseOpen harness wire
or disconnected
connector between
junction block and
control unitRemedy
Repair the harness
or plug in the
connector correctly
System voltage
0 V
Open harness wire
or disconnected
connector between
junction block and
control unitRepair the harness
or plug in the
connector correctly
00allOpen harness wire
between control
unit and groundRepair the harness
Improper groundCorrectly connect
connectionto ground

BODY - Troubleshooting23-21
1 2. Warning Light, Key Reminder Switch, Buzzer Circuit 1IIJUNCTION
BLOCK
WARNING LIGHT
gCTy4;NATION
c-7,,7L,,l7,/\
00IOA
IOA
2:y47
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141I
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1I
3
2
11
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10IGNITION SWITCH
<IGl > SUB FUSIBLE LINK @AUTOMATIC
SEAT BELT
CONTROL UNIT
t
11 WG
KEY REMINDER
6
\IL!>
Nhen ke
8emoved
13
+ installed
J
2
1SEAT BELT
WARNING BUZZER
20
w
IIem

23-22BODY - TroubleshootingCheck method
StepOperation
Check object
Varning lightJudgementCauseRemedy
NormalMalfunction
1Unplug theTerminal voltagewarnrng light
of warning light
connector
harness side
Ignition switch:
connector
ON(I-Ground)
2Connect the
Terminal voltagewarnrng light
of control unit
connector.
harness side
Unplug theconnector
connector from the (1 -Ground)
control unit.
Ignition switch:
ON
ey reminder switchSystem voltage
System voltage0 V
0 VOpen harness wireRepair the harnes:
or disconnectedor plug in the
connector between connector
correct1junction block and
combination meter
Open harness wireRepair the harries:
or disconnectedor plug in the
connector between connector
correctl!combination meter
and control unit
Warning light bulbReplace or
blown or in poorcorrectly install
contactthe warning light
1Disconnect the key Terminal voltageSystem voltage0 VOpen harness wireRepair the harness
reminder switchof key reminder
or disconnectedor plug in the
connector.
switch harnessconnector between connector
correct11side connector
junction block and
t 1 -Ground,
key reminderS-Ground)switch
2Plug the key
Terminal voltage13-Ground:ovOpen harness wireRepair the harness
reminder switchof control unitSystem voltageor disconnectedor plug in the
connector.
harness sideconnector between connector
correct11Unplug theconnectorkey reminder
connector from the
(13-Ground,switch and control
control unit12-Ground)unit
Remove the key
from the ignition
12-Ground:A voltage same asDefective keyCheck the key
switch.ovor lower thanreminder switchreminder switch.
system voltage(Refer to GROUP
84gnition Switch.1
3Insert the key.Terminal voltage
13-Ground:A voltage same
as or lower thanDefective keyCheck the key
of control unit
ovreminder switchreminder switch.
harness sidesystem voltage
(Refer to GROUP
connector
84gnition Switch.1(13-Ground,12-Ground)12-Ground:ovOpen harness wireRepair the harness
System voltageor disconnectedor plug in the
connector between connector correctly
key reminder switch
and control unit
lzzer
1Unplug the buzzer
Terminal voltageSystem voltage0 VOpen harness wireRepair the harness
connector.of harness side
or disconnectedor plug in the
connector
connector between connector correctly
t 1 -Ground)
junction block and
buzzer
2Plug in the buzzer
Terminal voltageSystem voltage0 VOpen harness wireRepair the harness
connector.
of control unit
or disconnectedor plug in the
Unplug the
harness side
connector between connector correctly
connector from the connector
buzzer and control
control unit
(20-Ground)unit

BODY - Troubleshootinn23-23
I3. Release Switch (driver’s side), Buckle Switch, Outer Switch CircuitI-1AUTOMATIC SEAT BELT CONTROL UNI
RELEASE SWITCH
(LEFT SIDE)
1
1BUCKLE
SWITCH
a19A0345
Repair the harness
or plug in the
connector correctly Check method
Step
OperationCheck objectlelease switch (driver’s side)Judgement
CauseRemedy
NormalMalfunction
1Unplug theTerminal-to-ground 0 QmclOpen harness wire
“release” switch
continuity ofor disconnected
connector.“release” switchconnector between
harness side“release” switch
connectorand ground
(1 -Ground)
Improper ground
connectionCorrectly connect
to ground
2Plug in theTerminal-to-ground 0 Q when slideRemainsDefective
“release” switch
continuity ofanchor is not inOQorooQ“release” switch
connector.control unitthe “release”
Unplug theharness side(switch
ON) range.
connector from the connectorOpen harness wire
control unit. Move
(5-Ground)ca g when slideor disconnected
the slide anchor.anchor is in theconnector between
“release” (switchcontrol unit and
OFF) range.“release” switchReplace the driving
device assembly.
(Refer to
P.23-94.1Repair the harness
or plug in the
connector
correctly.

23-24BODY - TroubleshootingCheck method
Step
OperationCheck object
Buckle switchJudgement
Cause
RemINormalMalfunction
1Unplug theTerminal-to-ground 0 Qconnector from the continuity of
buckle switch.
buckle switch
harness side
connector
(2-Ground)
2Plug in the buckle
Terminal-to-ground 0 nswitch connector.
continuity of
Unplug thecontrol unit
connector from the harness side
control unit.
connector
Leave the lap belt
(2-Ground)unfastened
(buckle switch ON).3uter switchOpen harness wire Repair the
between buckle
switch and ground
Improper groundCorrectly
cconnectionto ground
Open harness wire Repair the
between control
unit and buckle
switch
Defective buckleReplace th
switchbuckle.
(Refer to
F
1Unplug theTerminal-to-ground 0 QwflOpen harness wire
Repair the
connector fromcontinuity of outer
between outer
the outer switch.switch harness
switch and ground
side connectorL.H.Improper groundCorrectly
c(2-Ground)connectionto groundR.H.(4-Ground)
2Pull out andTerminal-to-ground 00 0 from theResistance remains Defective outerReplace thl
retract thecontinuity of outerbelt’s fullyOgorconswitchretractor
shoulder belt.switch sideretracted positionor changes from(for should1connectoruntil belt is pulledofltocon(Refer to FL.H. (l-2)out approx.or from 00 62R.L. (3-4)midway (outerto 0 62 at points
switch OFF)other than the
0
0 from theapprox. midway
approx. midwaypulled out position
pulled out position
until belt is pulled
out fully (outer
switch ON)
3Attach theTerminal-to-ground 0
62wdlOpen harness wire
Repair the
shoulder belt tocontinuity ofbetween control
the slide anchorcontrol unitunit and outer
(outer switch ON). harness sideswitch
Plug in the
connector
connector to theL.H.
outer switch.
(3-Ground)Unplug theR.H.connector from the(I 4-Ground)control unit.

BODY - Troubleshootinn23-254. Door Latch Switch, Fasten Switch, Release Switch (passenger’s side) Circuit
_-AUTOMATIC SEAT BELT CONTROL UNIT
I,
-- -----_ -"4 "21I
ifsII
II
IIFASTEN
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ISWITCHI
II(RIGHT
SIDE)
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5 2sI
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8
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I

23-26BODY - Troubleshooting
(1) Driver’s side
Check methodJudgement
StepCauseRemedy
Operation
Check objectNormalMalfunction
1Unplug the doorContinuity of door
Between terminalsRemainsDoor latch switchReplace the door
latch switchlatch switch
2 and 3OL4orooQdamagedlatch switch
connector.(2-3, I-3)0 0 when(Refer to P.2394.)
Open and close
door is open
the door
00 il when door
is closed
Between terminals
1 and 3
OQ Q when door
is open
0
il when
door is closed
2
-Terminal-to-ground 0 Qwi-2Open harness wireRepair the harness
continuity of dooror disconnectedor plug in the
latch switchconnector between connector correctI\
harness sidedoor latch switch
connectorand ground
(3-Ground)improper groundCorrectly connect
connectionto ground
3Connect the doorTerminal-to-ground0 0 when door isRemainsOpen harness wire Replace the
latch switchcontinuity of
openOgoroonor disconnectedharness or plug in
connector.control unitw 0 when door isconnector between the connector
Unplug theharness sideclosedcontrol unit andcorrectly.
connector from the connectordoor latch switch
control unit.
(6-Ground)Open and close
the door.
4Unplug theTerminal-to-ground
00 Q when door isRemainsOpen harness wireRepair the harness
“fasten” switch
continuity of theopenOgorooQor disconnectedor plug in the
connector.“fasten” switch0 s2 when door isconnector between connector correctly
Open and closeharness sideclosed“fasten” switch
the door.connectorand door latch
(6-Ground)switch
5Plug in theTerminal-to-ground 00 s2 when slideRemainsDefective “fasten”Replace the driving
“fasten” switchcontinuity ofanchor is in theOgoraogswitchdevice assembly
connector.control unit“fasten” range
Close the door.harness side(“fasten” switch
connector
OFF)(4-Ground)0 !I when slide
anchor is not in the
“fasten” range
(“fasten” switchON)