wiring MITSUBISHI 3000GT 1991 Repair Manual

52B-38 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting
TEST 7REPAIR REQUIRED FOR “33. CRANKING TRBL” FAULT1
STARTERHULAYIGNITIONSWITCH(ST>
7%INHIBITOR
10SWITCH
FI
pkEE&r -...__ -_-_-___I4SRS DIAGNOSIS UNITI
I---..-___________ - ____
2
14 13
!z
CLYL
da d4--__J/S
-A) @g
:6x36-NC-R1606-USRS diagnosis unit
13R0704View A
To front impact sensor (L.H.)
\To frontimpactsensor (R.H.)
II19FOllOTo clock spring
To body wiring harness (14-pin)
(I) Turn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
(2) Remove the rear console assembly. (Refer to GROUP 52A-.
13R07211310722
- Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken not
to damage the connector by using excessive force or bynot disconnecting it correctly.
(4) Remove the red
14-pin connector from the SRS diagnosis
unit while pressing down the lock of the connector. (Refer
to
P52B-9.1
I/’
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52B-40 SUPPLEMENTAL ,RESTRAINT SYSTEM (SRS) - Troubleshooting
TEST 8REPAIR REQUIRED FOR “34. CONN. UNLOCKED” FAULT
SRS DIAGNOSIS UNIT-
r
--
L
FRONTSIDE
EESELF-DIAGNOSISCHECK CONNECTORLOCK SWITCH(FOR MULTI-USETESTER)KXB-AX-RIRW-YSRS diagnoskunit
13RQ7Q4View A
To front impact sensor
(L.H.)Todlock spring
I19F0110
To body wiring harness (14-pin)
(1) Turn the ignition key to the “LOCK” position,
disconnect the negative battery cable and tape
the terminal.
Caution
Wait at least 30 seconds after disconnectingthe battery cable before doing any further
work. The SRS system is designed to retainenough voltage to deploy the air bag for ashort time even after the battery has been
disconnected, so serious injury may result
from unintended air bag deployment if, work
is done on the SRS system immediately afterthe battery cable is disconnected.
(2) Remove the floor console. (Refer to GROUP
52A
- Floor Console.)
Is the SDU lock lever securely locked?~JII’~~
I11I
-1 Malfunction of the SDU> Replace the SDU.
(Refer to P.52B-59.1INOTE
- IMPORTANT
(1) After repairing the SRS, reconnect the battery cable, erase the diagnosis code memory from theMulti-use Tester and check the SRS warning light operation to verify the system functions
properly. (Refer to Test 1.)
(2) SDU
= SRS Diagnosis Unit
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-41
1 TEST 9 1 REPAIR REQUIRED FOR “41. IG VOLT LOW 1” FAULT1
i
IGNITIONJTCH;
DIIll
MLLTI -PURPOSE
SRS DIAGNOSIS UNITr----------------------------A
f------ ‘iSRS diagnoiis unit
View A
To front impact sensor
(L.H.)
\To front impact sensor (R.H.)To
klock spring\19FOllO
To body wiring harness (14-pin)
+a-
Lock I
“(2 0-Ji9FO103-I-I
(1) Turn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.(2) Remove the rear console assembly. (Refer to GROUP 52A
-Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.(4) Disconnect the red
14-pin connector from the SRS diagno-
sis unit while pressing down the lock of the connector.
(Refer to
P.52B-9.)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-43
1 TEST 10 1 REPAIR REQUIRED FOR “42. IG VOLT LOW 2” FAULT1
,
IGNITION SWITCH(IG1)I
MILT I -PURPOSE
SRS DIAGNOSIS UNIT_~_----_-__--_--_-__---~--~~SRS diagnosis unit
13R0704
View ATo front impact sensor
(L.H.)
\ ,To front impact sensor (R.H.)To dlockspring
/lSFO110
To body wiring harness (14-pin)
(1) Turn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
(2) Remove the rear console assembly. (Refer to GROUP 52A-Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.(4) Disconnect the red
14-pin connector from the SRS diagno-
sis unit while pressing down the lock of the connector.
(Refer to
P.52B-9.)

52B-44 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting
MB991349SRS Check Harness(5) Connect the now disconnected red harness-side SDU
connector (14-pin) to the connector @ of the SRS Check
Harness.
(6) Check according to the flow chart below using the digital
> ~
multi-meter.d
View ASRS Check Harness connector @t- Fuse No. 11
Ground
/, NoIs there continuity between the No. 19or No. 20 terminal of SRS Checki- Ground circuit open1
Harness connector @ and ground?i
I
Yes
Reconnect negative terminal of
( py;;;;fgJ;p ~~y~~on>
- NoIs there a voltage of 9V or more be-> Damaged or disconnected wir-tween the No. 19 or 20 terminal (ground)
and the No. 11 terminal of the SRSing of fuse No. 11, or damaged
Check Harness connector
@?or disconnected body wiringharness.
Yes
(1) Turn the ignition keyto the.“LOCK” po-
sition, disconnect
the negative battery
cable and tape the
terminal.
(2) After waiting at least30 seconds, repair orreplace the body wir-ing harness. (Refer toP.52B-14.)
) Malfunction of the SDU> (1) Turn the ignition keyto the “LOCK” po-
sition, disconnect
the negative battery
cable and tape the
terminal.
(2) After waiting at least30 seconds, replace
the SDU. (Refer to
P.52B-59.)
1 TSB RevisionINOTE
- IMPORTANT
(1) After repairing the SRS, reconnect the battery cable, erase the diagnosis code memory from the’Multi-use Tester and check the SRS warning light operation to verify the system functions
\iproperly. (Refer to TEST 1.)
d(2)
SDU = SRS Diagnosis Unit

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-45
TEST 11REPAIR REQUIRED FOR “43. SRS LMP TRBL 1” FAULT
(SRS warning light does not extinguish)
IGNITION SWITCH(IG1)
COMBINATION METER(SRS WARNING LIGHT)1.4w x 2
r _________ - ____..__-----SRS DIAGNOSIS UN11I" n
/ 1 -1 "fT%~~ION CIRCUIT/
SELF-DIAGNOISISCHECK CONNECTOR(TFEOSRTOF.h~ll-USE=Kx35-Ax-RIY)I-I
SRS diagno&unit13R0704
View ATo front impact sensor (L.H.)
\To front impact sensor (R.H.1
To’clock spring\19FOllO
To body wiring harness (14-pin)
< lever
I 7’1,~,JLockspring ( lonnector notch-
2
(1) Turn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
netted .(2) Remove the rear console assembly. (Refer to GROUP 52A
Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.(4) Disconnect the red
16pin connector from the SRS diagno-
sis unit while pressing down the lock of the connector.
(Refer to
P.52B-9.)
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Troubleshooting 52B-47
TEST 12REPAIR REQUIRED FOR “43. SRS LMP TRBL 1” FAULT(SRS warning light does not illuminate)
M'LTI-PUROSE
1
COMEIINATION METER(SRS WARNING LIGHT)1.4w x 205
SRS DIAGNOSIS UNI'
piw&pg ‘---pm
‘=lam-Ax-9150,-Y
SRS diagnosis unit
13R0704
View ATo front impact sensor
(L.H.)
\ ITo front impact sensor (R.H.)
T
Odlock spring
I19FOH0
To body wiring harness (14-pin)
(1)
IikPl s-a7 Lock leverTurn the ignition key to the “LOCK” position, disconnect
the negative battery cable and tape the terminal.
Caution
Wait at least 30 seconds after disconnecting the battery
cable before doing any further work. The SRS system is
designed to retain enough voltage to deploy the air bagfor a short time even after the battery has been
disconnected, so serious injury may result from unin-
tended air bag deployment if work is done on the SRSsystem immediately after the battery cable is discon-
nected.
(2) Remove the rear console assemblv. (Refer to GROUP 52A
- Floor Console.)
(3) Use a screwdriver to push in the lock spring of the lock
lever of the SRS diagnosis unit to unlock the lock lever.
Caution
A double-lock mechanism is employed for the connec-
tor of the SRS diagnosis unit, so care must be taken notto damage it by using excessive force or by not
disconnecting it correctly.
-(4) Disconnect the red 14-pin connector from the SRS diagno-
sis unit while pressing down the lock of the connector.
(Refer to
P.52B-9.)
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52B-50 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - k%-%%,na~~g::i!isFrontupper frame lower
19FOO67
2-1 Front Impact Sensors
(1) Remove right and left front splash shield extensions.
Check sensors to ensure the arrow marks face the front
of the vehicle.
(2) Check front upper frame lowers and sensor brackets for
deformities or rust.
Caution
The SRS may not activate properly if a front impact
sensor is not installed properly, which could resultin serious injury or death to the vehicles driver.
(3) Check wiring harness (for front impact sensor) for
binds, connector for damage, and terminals for deformi-
ties.
Replace sensor and/or wiring harness if it fails visual
check. (Refer to
P.52B-56 and P.52B-14.)SRS Diagnosis Unit (SDU) 2-2
(11 Check SDU case and brackets for dents, cracks,
deformities or rust.
Caution
The SRS may not activate properly if SRS diagnosis
unit is not installed properly, which could result inserious injury or death to the vehicle’s driver.
(2) Check connectors and lock lever for damage, and
terminals for deformities or rust.
Replace SDU if it fails visual check. (Refer to
P.52B-59.)
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SRS Maintenance and
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Post-coltision Diagnosis 52B-51
2-3 Air Bag Module, Steering Wheel and Clock Spring
Rtng gearRotor
Screw
3at ca
To remote controlswitchAir bag module
Remote control
switch (radio)
To body wiring harness
SRS diagnosisunit
19FO150
19FO119(1) Remove air bag module from steering wheel. (Refer to
P.52B-62.)
CautionWhen disconnecting the air bag module-clock spring
connector, take care not to apply excessive force to it.(2) Check pad cover for dents, cracks or deformities.
CautionThe removed air bag module should be stored in a
clean, dry place with the pad cover face up.
1 TSB Revision

SRS Maintenance and
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - Post-collision Diagnosis 52B-53
2-4Front Wiring Harness and Body Wiring Harness
(12)lnstall the steering wheel, steering column covers and the
air bag module.
(13)Check steering wheel for noise, binds or difficult operation.
(14)Check steering wheel for excessive free play.
REPLACE ANY VISUALLY INSPECTED PART IF IT FAILS THAT
INSPECTION.(Refer to
P.52B-62.)
CautionThe SRS may not activate properly if any of the above
components is not installed properly, which could result inserious injury or death to the vehicle’s driver.
36FOO19(1) Check connectors for poor connections.
(2) Check harnesses for binds, connectors for damage, and
terminals for deformities.
REPLACE ANY CONNECTORS OR HARNESS THAT FAIL THE
VISUAL INSPECTION.
(Refer to
P.52B-14.)
CautionThe SRS may not activate properly if SRS harnesses or
connectors are damaged or improperly connected, whichcould result in serious injury or death to the vehicle’s
driver.
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