Mitsubishi Lancer Evolution 7. Manual — part 370
SRS - Post-collision Diagnosis
52B-45
POST-COLLISION DIAGNOSIS
Whether or not the air bags have deployed, check and service
the vehicle after collision as follows:
SRS-ECU MEMORY CHECK
1. Connect the MUT-II to the diagnosis connector. (Refer
to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.)
Caution
Refer to that the ignition switch is LOCK(OFF) when
connecting or disconnecting MUT-II.
2. Read (and write down) all displayed diagnosis codes.
(Refer to P.52B-9.)
NOTE
If battery power supply has been shut down by the
collision, the MUT-II cannot communicate with the
SRS-ECU. Check and, repair if necessary, the instrument
panel wiring harness before the next job.
3. Use the the MUT-II to read the data list (how long trouble(s)
have continued and how often memory have been
erased).
Data list
No
Service Data Item
Applicability
92
Number indication how often the memory is cleared.
Maximum time to be stored: 250
93
How long problem have lasted (How long it takes
from the occurrence of the problem till the first air bag
squib igniting signal)
Maximum time to be stored: 9999 minutes
(approximately 7 days)
94
How long problem(s) have lasted (How long it takes
from the first air bag squib igniting signal till now.)
4. Erase the diagnosis codes and after waiting 5 seconds
or more read (and write down) all displayed diagnosis
codes. (Refer to P.52B-9.)
SRS - Post-collision Diagnosis
52B-46
REPAIR PROCEDURE
DEPLOYED DRIVER’S AND FRONT PASSENGER’S AIR
BAGS OR OPERATED SEAT BELT PRE-TENSIONER.
1. Replace the following parts with new ones.
D
SRS-ECU (Refer to P.52B-50.)
D
Driver’s air bag module (Refer to P.52B-52.)
D
Front passenger’s air bag module (Refer to P.52B-52.)
D
Seat belt with pre-tensioner (Refer to P.52B-61.)
2. Check the following parts and replace if malfunction is
found:
D
Clock spring (Refer to P.52B-52.)
D
Steering wheel, steering column and intermediate
joint
(1) Check the wiring harness (built into steering
wheel) and connectors for damage, and terminals
for deformation.
(2) Check the driver’s air bag module for proper
installation to the steering wheel.<RS>
(3) Check the steering wheel for noise, binds or
difficult operation and excessive free play.
3. Check the harness for binding, connectors for damage,
poor connections, and terminals for deformation.
(Refer to P.52B-44.)
UNDEPLOYED AIR BAGS OR UNOPERATED SEAT BELT
WITH PRE-TENSIONER IN LOW-SPEED COLLISION
Check the SRS components and seat belt with pre-tensioner.
If visible damage such as dents, cracks, or deformation are
found on the SRS components and seat belt with
pre-tensioner, replace them with new ones. Concerning parts
removed for inspection, replacement with new parts and
cautions in working, refer to INDIVIDUAL COMPONENT
SERVICE, P.52B-49.
SRS - Post-collision Diagnosis
52B-47
SRS-ECU
1. Check the SRS-ECU case and bracket for dents, cracks
or deformation.
2. Check the connector for damage, and terminals for
deformation.
3. Check the SRS-ECU and bracket for proper installation.
Driver’s and passenger’s air bag modules
1. Check the covers for dents, cracks or deformation.
2. Check the connectors for damage, the terminals
deformities, and the harness for binds.
3. Check the air bag inflator cases for dents, cracks or
deformities.
4. Check the air bag modules for proper installation.
Clock spring
1. Check the clock spring connectors and protective tubes
for damage, and terminals for deformation.
2. Visually check the case for damage.
SRS-ECU
Inflator
Connector
Connector
Steering
wheel-driver’s
air bag module
assembly
<RS>
<RS-II/GSR>
<Driver’s side>
<Front passenger’s side>
Connector
Inflator case
Protective tubes
Case
SRS - Post-collision Diagnosis
52B-48
Steering wheel, steering column and intermediate joint
1. Check the driver’s air bag module for proper installation
to the steering wheel.
2. Check the steering wheel for noise, binds or difficult
operation and excessive free play.
Harness connector (Instrument panel wiring harness,
Floor wiring harness)
Check the harness for binds, the connector for damage and
the terminals for deformation. (Refer to P.52B-44.)
Seat belt with pre-tensioner
1. Check the seat belt for damage or deformation.
2. Check the pre-tensioner for cracks or deformation.
3. Check the harness or the connector for damage, and
the terminal for deformation.
4. Check that the unit is installed correctly to the vehicle
body.
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