Mitsubishi Lancer Evolution 7. Manual — part 142
GENERAL -
Supplemental Restraint System (SRS)
00-21
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
To improve safety, the SRS and seat belts with
pre-tensioner. These systems enhance collision
safety by restraining the front passengers in case
of an accident. The SRS works with the
pre-tensioner simultaneously when a collision is
detected.
The SRS consists of two air bag modules, SRS
air bag control unit (SRS-ECU), SRS warning lamp
and clock spring. The air bags are located in the
center of the steering wheel, above the glove box.
Each air bag has a folded air bag and an inflator
unit. The SRS-ECU under the floor console monitors
the system and has a safing G-sensor and an
analog G-sensor. The warning lamp on the
instrument panel indicates the operational status
of the SRS. The clock spring is installed in the
steering column. The seat belt pre-tensioner is built
into the front seat belt retractor. Only authorized
service personnel should do work on or around
the SRS components and seat belt with
pre-tensioner. Those service personnel should read
this manual carefully before starting any such work.
Extreme care must be used when servicing the
SRS to avoid injury to the service personnel (by
inadvertent deployment of the air bags or
inadvertent operation of the seat belt with
pre-tensioner) or the driver (by rendering the SRS
or the seat belt with pre-tensioner inoperative).
Diagnosis
connector
Front passenger’s
air bag module
Clock spring
Driver’s air bag
module
SRS-ECU
SRS warning lamp
Driver’s air bag Front
passenger’s
air bag
Seat belt with
pre-tensioner
GENERAL -
Supplemental Restraint System (SRS)
00-22
SRS SERVICE PRECAUTIONS
1. In order to avoid injury to yourself or others
from accidental deployment of the air bag and
accidental operation of the seat belt with
pre-tensioner during servicing, read and
carefully follow all the precautions and
procedures described in this manual.
2. Do not use any electrical test equipment on
or near SRS components, except those
specified on P.52B-6.
3. Never Attempt to Repair the Following
Components:
D
SRS air bag control unit (SRS-ECU)
D
Clock spring
D
Driver’s and front passenger’s air bag
modules
D
Seat belt with pre-tensioner
NOTE
If any of these components are diagnosed as
faulty, they should only be replaced, in
accordance with the INDIVIDUAL COM-
PONENTS SERVICE procedures in this
manual. (Refer to P.52B-49.)
4. After disconnecting the negative (–) battery cable,
wait 60 seconds at least before any service and
insulate the disconnected cable with tape. The SRS
retain enough voltage to deploy the air bags for a
short time even after the disconnection of the battery.
So, serious injury may result by accidental air bag
deployment if a work is done on the SRS just after
the disconnection of the battery.
5. Do not attempt to repair the wiring harness connectors
of the SRS. If the connector(s) are diagnosed as defective,
replace the wiring harness(es). If the harness(es) are
diagnosed as faulty, replace or repair the wiring
harness(es) according to the table that follows.
Insulating tape
Battery
SRS-ECU connector
GENERAL -
Supplemental Restraint System (SRS)
00-23
SRS-ECU
Terminal No.
Destination of harness
Corrective action
7
Instrument panel wiring harness → Earth
Repair or replace each wiring
harness
8
Instrument panel wiring harness → Combination meter
(SRS warning lamp)
harness
9, 10
Instrument panel wiring harness → Front passenger’s air bag
module
11, 12
Instrument panel wiring harness → Clock spring → Driver’s air bag
module)
Repair or replace the dash wiring
harness. Replace clock spring.
13
Instrument panel wiring harness → Junction block (fuse No.3)
Repair or replace each wiring
harness
16
Instrument panel wiring harness → Junction block (fuse No.2)
harness.
20
Instrument panel wiring harness → Diagnosis connector
29, 30
Floor wiring harness → Driver’s seat belt pre-tensioner
27, 28
Floor wiring harness → Front passenger’s seat belt pre-tensioner
6. Inspection of the SRS-ECU harness connector should be carried out by the following procedure.
Insert the special tool (probe, MB991222, in the harness set) into the connector from harness side
(rear side), and connect the tester to this probe. If any tool than specified is used, damage to the
harness and other components will result. Furthermore, measurement should not be carried out by
touching the probe directly against the terminals from the front of the connector. The terminals are
plated to increase their conductivity, so that if they are touched directly by the probe, the plating
may break, which will cause drops in reliability.
MB991222
SRS-ECU harness connector
SRS-ECU harness connector (rear view)
7. SRS components and seat belt with pre-tensioner should not be subjected to hart, so remove the
SRS-ECU, driver’s and front passenger’s air bag modules, clock spring, and seat belt with pre-tensioner
before drying or baking the vehicle after painting.
D
SRS-ECU, air bag module, clock spring : 93℃ or more
D
Seat belt with pre-tensioner : 90℃ or more
8. Whenever you finish servicing the SRS, check warning lamp operation to make sure that the system
functions properly. (Refer to P.52B-6.)
9. Make certain that the ignition switch is LOCK (OFF) position when the MUT-II is connected or
disconnected.
10. If you have any questions about the SRS, please contact your local distributor.
NOTE
SERIOUS INJURY CAN RESULT FROM UNINTENDED AIR BAG DEPLOYMENT, SO USE ONLY
THE PROCEDURES AND EQUIPMENT SPECIFIED IN THIS MANUAL.
GENERAL -
Support Locations for Lifting and Jacking
00-24
SUPPORT LOCATIONS FOR LIFTING AND JACKING
Caution
Do not support the vehicles at locations other than specified supporting points. Doing so will
cause damage, etc.
SUPPORT POSITIONS FOR A GARAGE JACK AND AXLE STANDS
GARAGE JACK
Caution
Never support any point other than the specified ones, or deformation will result.
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