Mitsubishi Lancer Evolution IX. Manual - part 647

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-101

NOTE: 

Prior to the wiring harness inspection, check junction 
block connectors C-211 and C-214, and repair if nec-
essary.

Q: Is the check result normal?

YES : 

An intermittent malfunction is suspected 

(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Repair the harness wires.

STEP 7. Retest the system.

Q: Does the M.U.T.-II/III communicate normally with 

the SRS system?
YES : 

An intermittent malfunction is suspected 

(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Replace the SRS-ECU (Refer to 

P.52B-109

).

AC303823

Junction block (front view)

Connectors: C-211, C-214

C-214

C-211

AV

<RHD>

C-211

Harness side
(front view)

C-214

AC303809

Junction block (front view)

Connectors: C-211, C-214

C-211

Harness side
(front view)

C-214

C-211

AY

<LHD>

C-214

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-102

POST-COLLISION DIAGNOSIS

M1524001100692

Whether or not the air bags have deployed, check 
and service the vehicle after collision as follows:

SRS-ECU MEMORY CHECK

CAUTION

Refer to that the ignition switch is "LOCK" (OFF) 
when connecting or disconnecting M.U.T.-II/III.
1. Connect the M.U.T.-II/III to the diagnosis 

connector (Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

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 M.U.T.-II/III cannot com-
municate with the SRS-ECU. Check and, repair if 
necessary, the instrument panel wiring harness 
before the next job.

3. Use the M.U.T.-II/III to read the data list (how long 

trouble(s) have continued and how often memory 
have been erased).

AC304777

Steering shaft

AB

MB991502

<Using the M.U.T.-II>

AC211686

MB991911

16-PIN

MB991827

MB991824 

AE

<Using the M.U.T.-III>

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-103

Data list

4. Erase the diagnosis codes and after waiting 5 

seconds or more read (and write down) all 
displayed diagnosis codes.

REPAIR PROCEDURE
WHEN FRONT AIR BAGS DEPLOY IN A 
COLLISION

1. Replace the following parts with new ones.

• Front impact sensor (Refer to 

P.52B-107

).

• SRS-ECU (Refer to 

P.52B-109

).

• Driver’s and passenger’s (front) air bag modules 

(Refer to 

P.52B-110

).

• Seat belt with pre-tensioner (Refer to 

P.52B-117

).

• Instrument panel (Refer to GROUP 52A − Instru-

ment Panel Assembly 

P.52A-2

).

2. Check the following parts and replace if there are 

any malfunctions.

• Clock spring (Refer to 

P.52B-110

).

• Steering wheel, steering column and shaft 

assembly

(1) Check the wiring harness (built into the 

steering wheel) and connectors for damage, 
and terminals for deformation.

(2) Install the air bag module to check fit or 

alignment with the steering wheel.

(3) Check the steering wheel for noise, binds or 

difficult operation and excessive free play.

(4) Check the steering column shaft shock 

absorbing mechanism (Refer to GROUP 37 

− 

On-vehicle Service 

P.37-12

).

3. Check the harness for binding, connectors for 

damage, poor connections, and terminals for 
deformation (Refer to 

P.52B-2

).

WHEN AIR BAGS DO NOT DEPLOY IN 
LOW-SPEED COLLISION

Check the SRS components. If visible damage such 
as dents, cracks, or deformation are found on the 
SRS components, replace them with new ones. Con-
cerning parts removed for inspection, replacement 
with new parts and cautions in working refer to 

P.52B-105

.

FRONT IMPACT SENSOR

1. Check the radiator support panel for distortion and 

rust.

2. Check the front impact sensor for dents, cracks, 

deformation or rust.

3. Check the front impact sensor wiring harness for 

binding, check the connector for damage, and 
check the terminals for deformation.

SRS-ECU

No

Data List Item

Applicability

92

Number indicating how often the memory is 
cleared

Maximum time to be stored: 250 times

93

How long a problem has lasted (How long it 
takes from the occurrence of the problem till 
the first air bag squib igniting signal)

Maximum time to be stored: 9,999 minutes 
(approximately 7 days)

94

How long a problem has lasted (How long it 
takes from the first air bag squib igniting 
signal till now).

AC208855

Front impact
sensor

AF

Battery

AC300582

SRS-ECU

AB

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-104

1. Check the SRS-ECU case and brackets for dents, 

cracks or deformation.

2. Check the connector for damage, and the 

terminals for deformation.

3. Check the SRS-ECU and bracket for installation 

condition. 

AIR BAG MODULES

1. Check the pad cover for dents, cracks or 

deformation.

2. Check the connector for damage, terminals 

deformities, and the harness for binding.

3. Check the air bag inflator case for dents, cracks or 

deformities.

4. Check the air bag modules for proper installation.

CLOCK SPRING

1. Check the clock spring connectors and protective 

tube for damage, and the terminals for 
deformation.

2. Visually check the case for damage.

STEERING WHEEL, STEERING COLUMN 
AND SHAFT ASSEMBLY

1. Check the wiring harness (built into the steering 

wheel) and the connectors for damage, and the 
terminals for deformation.

2. Install the air bag module to check fit or alignment 

with the steering wheel.

3. Check the steering wheel for noise, binding or 

difficult operation and excessive free play.

4. Check the steering column shaft shock absorbing 

mechanism (Refer to GROUP 37 

− On-vehicle 

Service 

P.37-12

).

SEAT BELT WITH PRE-TENSIONER

1. Check the seat belt for damage or deformation.
2. Check the seat belt with pre-tensioner for cracks 

or deformation.

3. Check that the unit is installed correctly to the 

vehicle body.

HARNESS CONNECTOR (INSTRUMENT 
PANEL WIRING HARNESS AND FLOOR 
WIRING HARNESS, ROOF WIRING 
HARNESS)

Check harnesses for binding, connectors for damage 
and terminals for deformation (Refer to 

P.52B-2

).

AC006205

AC311067

AC304700

Steering 
wheel

AC

Inflator case

Connector

<Driver's side>

Connector

<Front passenger's side>

AC300585AB

Case

Protective tubes