1999 MITSUBISHI LANCER EVOLUTION VI ECU

SRS – Warning/Caution Labels52B-23
WARNING/CAUTION LABELS
A number of caution labels related to the SRS are
found in the vehicle, as shown in the followingillustration. Follow label instructions when servicing
SRS. If labels are dirty or damaged, replace them.
Steering wheel Air bag module (driver’s side) Clock spring
Glove box Sun visor SRS-ECU
Steering gear and linkage Air bag module
(front passenger’s side)

SRS – SRS-ECU52B-24
SRS AIR BAG CONTROL UNIT (SRS-ECU)
Caution
1. Disconnect the battery (–) terminal and wait
for 60 seconds or more before starting work.
Furthermore, the disconnected battery
terminal should be covered with tape to
insulate it. (Refer to P.52B-3.)
2. Never attempt to disassemble or repair the
SRS-ECU. If faulty, replace it.3. Do not drop or subject the SRS-ECU to
impact or vibration.
If denting, cracking, deformation, or rust
are discovered in the SRS-ECU, replace it
with a new SRS-ECU. Discard the old one.
4. After deployment of an air bag, replace the
SRS-ECU with a new one.
REMOVAL AND INSTALLATION
Pre-removal Operation

Turn the ignition key to the LOCK (OFF) position.

Negative (–) battery cable connection
1
4.9 Nm
Removal steps

Floor console
1. SRS-ECUInstallation steps
B
Post-installation inspection

Negative (–) battery cable connection
A1. SRS-ECU

Floor console

SRS – SRS-ECU / Air Bag Modules and Clock Spring52B-25
INSTALLATION SERVICE POINTS
ASRS-ECU INSTALLATION
Caution
The SRS may not activate if SRS-ECU is not installed
properly, which could result in serious injury or death
to the vehicle’s driver or front passenger.
BPOST-INSTALLATION INSPECTION
1. Reconnect the negative battery terminal.
2. Turn the ignition key to the “ON” position.
3. Does the “SRS” warning lamp illuminate for about 7
seconds, and then remain extinguished for at least 5
seconds after turning OFF?
4. If yes, SRS system is functioning properly.
If no, consult page 52B-6.
INSPECTION

Check the SRS-ECU and brackets for dents, cracks or
deformation.

Check connector for damage, and terminals for
deformation.
Caution
If a dent, crack, deformation or rust is discovered,
replace the SRS-ECU with a new one.
NOTE
For checking of the SRS-ECU other than described above,
refer to the section concerning troubleshooting. (Refer
to P.52B-6.)
AIR BAG MODULES AND CLOCK SPRING
Caution
1. Disconnect the battery (–) terminal and wait
for 60 seconds or more before starting work.
Furthermore, the disconnected battery
terminal should be covered with tape to
insulate it. (Refer to P.52B-3.)
2. Never attempt to disassemble or repair the
air bag modules or clock spring.
If faulty, replace it.
3. Do not drop the air bag modules or clock
spring or allow contact with water, grease
or oil.
Replace it if a dent, crack, deformation or
rust is detected.
4. The air bag modules should be stored on
a flat surface and placed so that the pad
surface is facing upward.
Do not place anything on top of it.5. Do not expose the air bag modules to
temperatures over 93C.
6. Both driver’s side and front passenger’s
side air bag modules should be replaced
with new ones once the respective air bags
were deployed. The clock springs should
also be checked and replaced with new ones
if considered abnormal.
7. Wear gloves and safety glasses when
handling air bags that have already
deployed.
8. An undeployed air bag module should only
be disposed of in accordance with the
procedures (Refer to P.52B-32.)
SRS warning lamp

SRS – Air Bag Module Disposal Procedures52B-37
(2) Connect two wires, each six meters or longer, to the
two leads of SRS air bag adapter harness B side>, and cover the connections with insulation tape.
The other ends of the two wires should be connected
to each other (short-circuited), to prevent sudden
unexpected deployment of the air bag module.
(3) Take the SRS air bag adapter harness B that is
connected to the wires, pass it beneath the old tyre
wheel assembly, and connect it to the air bag module.
(4) Pass the thick wire through the air bag module
mounting hole, and then secure the air bag module
to an old tyre with a wheel in it so that the pad on
the module is facing upwards.
Caution
Leave some space below the wheel for the adaptor
harness. If there is no space, the reaction when
the air bag deploys could damage the adaptor
harness.
(5) Place three old tyres with no wheels on top of the
tyre secured to the air bag module.
Two wires
SRS air bag
adapter
harness B
MR203491 or
MB628919Connection
6 m
long or
more
Insulation tape
Air bag module
Deployment wire
harness
Tyres without wheels
Deployment wire harness

SRS – Air Bag Module Disposal Procedures52B-39

(1) Remove the air bag module from the vehicle.
(Refer to P.52B-27.)
Caution
The connector of the front passenger’s side air
bag module is so constructed that the positive
and negative terminals are automatically
short-circuited when it is disconnected to prevent
an accidental deployment of the air bag resulting
from static electricity generation. Nevertheless,
to eliminate the slightest possibility of an
accidental deployment, always bear the following
in mind; the air bag module should be stored on
a flat surface and placed so that the pad cover
face up. Anything should not be placed on top
of it.
(2) Connect two wires, each six meters or longer, to the
two leads of SRS air bag adapter harness A and
cover the connections with insulation tape. The other
ends of the two wires should be connected to each
other (short-circuited), to prevent sudden unexpected
deployment of the air bag module.
(3) Connect the deployment wires to the SRS air bag
adaptor harness A, pass it beneath the tyre, and
wheel assembly, and connect it to the air bag module.
(4) Pass the thick wires into the hole of the air bag module
bracket, and secure it to the wheel of the old tyre
with wheel (4 locations), with the air bag facing
upwards.
Caution
1) Leave some space below the wheel for the
deployment wires.
If there is no space, the reaction of the air
bag deployment could result in damage of
the adaptor harness.
2) While deployment takes place, do not have
the connector of the SRS air bag adaptor
harness A inserted between the tyres.
SRS air bag
adapter
harness A
MB686560Connection
6 m or
longer
Two wires Insulation
tape
Deployment wire
Air bag module

SRS – Air Bag Module Disposal ProceduresSRS – Air Bag Module Disposal Procedures52B-40
(5) Place three old tyres, without wheels, on top of the
tyre secured to the air bag module, and secure all
tyres with ropes (4 locations).
NOTE
The front passenger’s side air bag is larger in capacity
than the driver’s side air bag when deployed. For
this reason, it is necessary to tie up all tyres together
with rope.
(6) At a location as far away from the air bag module
as possible, and from a shielded position, disconnect
the two connected wires from each other, and connect
them to the two terminals of the battery (which has
been removed from the vehicle) to deploy the air
bag.
Caution
1) Before deployment, check carefully to be sure
that no one is nearby.
2) The inflator will be quite hot immediately
following the deployment, so wait at least 30
minutes to allow it to cool before attempting
to handle it. Although not poisonous, do not
inhale gas from air bag deployment. See
Deployed Air Bag Module Disposal
Procedures (P.52B-40) for post-deployment
handling instructions.
3) If the air bag fails to deploy when the
procedures above are followed, do not go near
the module. Contact your local distributor.
(7) After deployment, dispose of the air bag module
according to the Deployed Air Bag Module Disposal
Procedures.
DEPLOYED AIR BAG MODULE DISPOSAL
PROCEDURES
After deployment, the air bag module should be disposed
of in the same manner as any other scrap parts, adhering
to local laws and/or legislation that may be in force except
that the following points should be carefully noted during
disposal.
1. The inflator will be quite hot immediately following
deployment, so wait at least 30 minutes to allow it cool
before attempting to handle it.
2. Do not put water or oil on the air bag after deployment.
Tyres without wheels
Deployment wire
harness
Deployment wire
harness

54-1
CHASSIS
ELECTRICAL
CONTENTS
GENERAL 3. . . . . . . . . . . . . . . . . . . . . . . . . .
BATTERY 3. . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATION 3. . . . . . . . . . . . . . .
ON-VEHICLE SERVICE 3. . . . . . . . . . . . . . . . . .
IGNITION SWITCH EVOLUTION-VI WITH IMMOBILIZER
SYSTEM> 6. . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOL 6. . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 6. . . . . . . . . . . . . . . . . . . .
IGNITION SWITCH 11. . . . . . . . . . . . . . . . . . . . . .
IGNITION SWITCH AND IMMOBILIZER
SYSTEM IMMOBILIZER SYSTEM> 13. . . . . . . . . . .
SPECIAL TOOL 13. . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 13. . . . . . . . . . . . . . . . . .
IGNITION SWITCH AND IMMOBILIZER
SYSTEM 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMBINATION METERS 22. . . . . . . . . . . .
SERVICE SPECIFICATIONS 22. . . . . . . . . . . .
SEALANT 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS 23. . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 24. . . . . . . . . . . . . . . . . .
CONTINUED ON NEXT PAGE
WARNINGS REGARDING SERVICING OF SUPPLEMENTAL RESTRAINT SYSTEM (SRS) EQUIPPED VEHICLES
WARNING!
(1) The service personnel must thoroughly review this manual, and especially its GROUP 52B – Supplemental Restraint
System (SRS) before beginning any service or maintenance of any component of the SRS or any SRS-related
component.
(2) When removing or installing the components indicated in the table of contents by an astarisk (*), use utmost care so
as not to apply any strong shock to SRS components.
NOTE
The SRS includes the following components: SRS-ECU, SRS warning lamp, air bag module, clock spring and interconnecting
wiring. Other SRS-related components (that may have to be removed/installed in connection with SRS service or maintenance) are
indicated in the table of contents by an asterisk (*).

CHASSIS ELECTRICAL – Ignition SwitchCHASSIS ELECTRICAL – Ignition Switch54-6
IGNITION SWITCH IMMOBILIZER SYSTEM>
SPECIAL TOOL
ToolNumberNameUse
MB991502MUT-II sub
assemblyETACS-ECU input signal checking
TROUBLESHOOTING
DIAGNOSIS FUNCTION
INPUT SIGNAL INSPECTION POINTS WITH ETACS-ECU>
Refer to Group 00 – How to Use Troubleshooting / Inspection
Service Points.
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomsInspection
procedureReference page
Communication with
MUTIIis impossible
Key hole illumination lamp remains illuminated.154-7
MUT-II is impossible.
Even if driver’s side door is opened, key hole
illumination lamp does not illuminate.254-7
While key hole illumination lamp is illuminated,
ignition key is turned to the ON position but key hole
illumination lamp does not switch off. (However, it
switch off after 10 seconds.)354-8
Key reminder warning
buzzer systemWhile the key reminder warning buzzer is sounding,
the ignition key is turned to the ON position but the
sound dose not stop. (However, it stops when the
driver’s side door is closed.)354-8
The key reminder warning buzzer dose not stop
sounding even if the key is removed. (However, it
stops when the driver’s side door is closed.)454-9
The key reminder warning buzzer does not sound
ever if the driver’s side door is opened while the key
is still inserted. (However, the ignition key should be
in the OFF position.)554-10
NOTE
If every input signal can not be checked with the MUT-II, a diagnosis circuit system failure is probably
the cause.