Mitsubishi Colt Ralliart. Manual - part 574

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-134

STEP 4. Voltage measurement the power supply
circuit to the SRS-ECU connector B-35.
(1) Disconnect the negative battery terminal.

(2) Disconnect SRS-ECU connector B-35 and

measure at the wiring harness side.

(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Voltage measurement between terminals 13, 16

and body earth.

OK: 9 V or more

Q: Is the check result normal?

YES : .

Go to Step 7.

NO : .

Go to Step 6.

STEP 5. Check the harness wires between
SRS-ECU connector B-35 and diagnosis
connector B-32.

Q: Is the check result normal?

YES :

An intermittent malfunction is suspected

(Refer to GROUP 00, How to Cope with
Intermittent Malfunction

P.00-13

NO :

Check the harness wires for open or short
circuit between SRS-ECU connector B-35
(terminal No.20) and diagnosis connector
B-32 (terminal No.7) and repair if necessary.

AC206285

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC006265

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

B-35 Harness side
connector (rear view)

AC206285

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC313822 AC

Connector: B-32

Harness side
(Front side)

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TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-135

STEP 6. Check the connectors between SRS-ECU
connector B-35 and ignition switch connector
B-141.

NOTE:

Prior to the wiring harness inspection, check junction
block connectors B-129 and B-131, and repair if nec-
essary.

Q: Is the check result normal?

YES :

An intermittent malfunction is suspected

(Refer to GROUP 00, How to Cope with
Intermittent Malfunction

P.00-13

NO :

Check the harness wires for open or short
circuit between SRS-ECU connector B-35
(terminal No.40) and ignition switch
connector B-141, and repair if necessary.

STEP 7. Retest the system.

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

SRS system?
YES :

An intermittent malfunction is suspected

(Refer to GROUP 00, How to Cope with
Intermittent Malfunction

P.00-13

NO :

Replace the SRS-ECU (Refer to

P.52B-143

AC206285

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC313828 AG

Connector: B-141

Harness side
connector
(front view)

Clock spring

AC313827AH

B-131

B-129

Connectors: B-129, B-131

Junction block (Rear view)

Harness side

B-129

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POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-136

POST-COLLISION DIAGNOSIS

M1524001101189

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.-III.
1. Connect the M.U.T.-III to the diagnosis connector

(Refer to GROUP 00, Diagnosis Function

P.00-7

2. Read (and write down) all displayed diagnosis

codes (Refer to

P.52B-11

NOTE: If battery power supply has been shut
down by the collision, the M.U.T.-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.-III to read the data list (how long

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

Data list

4. Erase the diagnosis codes and after waiting 5

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

AC206895

Diagnosis

connector

MB991827

MB991824

MB991910

Service Data Item

Applicability

Number indicating how often the memory is
cleared

Maximum time to be stored: 250 times

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)

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

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POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-137

REPAIR PROCEDURE
WHEN FRONT AIR BAGS DEPLOY IN A
COLLISION.

1. Replace the following parts with new ones.

• SRS-ECU (Refer to

P.52B-143

• Front air bag modules (Refer to

P.52B-145

• Seat belt with pre-tensioner (Refer to

P.52B-159

• Front impact sensor (Refer to

P.52B-141

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

ment Panel Assembly

P.52A-3

2. Check the following parts and replace if there are

any malfunctions.

• Clock spring (Refer to

P.52B-145

• 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.37-89

3. Check the harness for binding, connectors for

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

P.52B-5

WHEN SIDE AIR BAGS DEPLOY IN A
COLLISION.

1. Replace the following parts with new ones.

• SRS-ECU (Refer to

P.52B-143

• Side impact sensors (Refer to

P.52B-157

• Curtain air bag modules (Refer to

P.52B-152

• Side-airbag modules (Refer to

P.52B-152

2. Check the harness for binding, connectors for

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

P.52B-3

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-139

FRONT IMPACT SENSOR

1. Check the head lamp 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.
NOTE: The figures show front impact sensors
(LH). The front impact sensors (RH) is symmetri-
cal with the front impact sensors (LH).

SRS-ECU

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.

AC206550AG

Front impact sensor

Radiator
condenser
tank

AC207597

SRS-ECU

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