Mitsubishi Outlander (2013+). Manual - part 203

SYSTEM CONSTRUCTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-12

• The front impact sensor transmits the coded 

acceleration data to SRS-ECU. Based on the 
data, SRS-ECU determines the deployment of 
the side-airbags and curtain air bags, then ener-
gises appropriate squib(s).

• SRS-ECU performs the diagnostics of the side 

impact sensor internal components. If a malfunc-
tion occurs, it sets the diagnosis code.

SEAT BELT WITH PRE-TENSIONER

M2521008000786

The seat belt incorporating the pretensioner auto-
matically winds the seatbelt upon front impact to 
reduce forward shifting of the passenger.

The seat belt pre-tensioner ignites the gas generator 
and emits gas with the electric current supplied from 
SRS-ECU. The gas pressure shifts the ball in the 
pipe and the balls comes in contact with the protru-
sion of the ring gear, which is inserted in the ring 
gear and then interlocked with the pinion is inserted 
in the ring gear The ring gear rotation forces the pin-
ion to turn the spool toward the belt wind direction to 
wind the belt.

ACC00555

ACC00081

ACC00046

ACC00504

ACC00505

AB

Gas generator

Spool

Pinion

Ring gear

Pipe

Ball

Seat belt pre-tensioner

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SYSTEM CONSTRUCTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-13

PASSENGER'S AIR BAG CUT OFF SWITCH

M2521001700278

Passenger’s air bag cut off switch is located in the 
instrument panel passenger’s side. The passenger’s 
air bag cut off switch can be used to disable the pas-
senger's (front) air bag.

• To turn an air bag off, follow these steps:

1. Insert the ignition key into the key opening of 

the appropriate air bag cut off switch, and turn 
that air bag cut off switch to the "OFF" posi-
tion.

2. Remove the key from the key opening of that 

air bag cut off switch.

3. Insert the key into the ignition switch, and turn 

the ignition to "ON" position. 

• To turn an air bag on, follow these steps:

1. Insert the key into the key opening of the 

appropriate air bag cut off switch, and turn 
that air bag cut off switch to "ON" position.

2. Remove the key from the key opening of that 

air bag cut off switch.

3. Insert the key into the ignition switch, and turn 

the ignition to "ON" position. 

PASSENGER'S AIR BAG ON/OFF INDICATOR LAMP

M2521001600196

The passenger’s air bag ON/OFF indicator lamp is 
installed in centre air outlet. 

When passenger’s air bag cut off switch is turned 
OFF, the indicator will stay on to show that the pas-
senger’s (front) air bag is not operational. 

ACB05631

ACB05632

ACC00118

Passenger's air bag 
cut OFF switch

Instrument panel

Front view

AB

ACB05561

ACC00116

ACB05034

Passenger's air bag 
ON indicator lamp

Passenger's air bag 
OFF indicator lamp

Hazard indicator assembly

AB

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SYSTEM CONSTRUCTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-14

When passenger’s air bag cut off switch is turned 
ON, the indicator goes off to show that the passen-
ger’s (front) air bag is operational.

SRS-ECU

M2521007001054

In addition to the analogue G-sensor and safing 
G-sensor for the frontal collision, the SRS-ECU 
incorporates the analogue G-sensor and safing 
G-sensor for the side collision. Upon a frontal colli-
sion, when the impact G is simultaneously detected 
by the front impact sensor in the engine room, ana-
logue G-sensor, and safing G-sensor for the frontal 
collision in SRS-ECU, SRS-ECU outputs the ignition 
signal to the driver's and passenger's (front) air bag 
modules (squibs).
Upon a side collision, when the lateral impact G is 
simultaneously detected by the analogue G-sensor 
of side impact sensor and the safing G-sensor for 
side collision in SRS-ECU, the SRS-ECU outputs the 
ignition signal to the side-airbag module (squib) and 
the curtain air bag module (squib) of the relevant 
side that is subjected to the impact.
Also, SRS-ECU has the following functions that 
improve the system reliability.

• Power supply back-up function (back-up con-

denser) in preparation for the power supply mal-
function upon a collision

• Booster function (DC-DC converter) in prepara-

tion for the battery voltage drop

• Diagnosis function that performs a system check

DIAGNOSIS FUNCTION

To improve the system reliability, SRS-ECU performs 
the diagnostics of each part. If a malfunction is 
detected, it lights up the SRS warning lamp, and 
stores the contents as the corresponding diagnosis 
code. Also, to facilitate the system check, it has the 
following functions, and the check can be performed 
using M.U.T.-III.

• Diagnosis code set

• Service data output

• Actuator test

DIAGNOSIS CODE SET

SRS-ECU performs a self-diagnosis on the following 
items. If a malfunction is detected, its content (diag-
nosis code) is stored in the involatile memory (EEP-

ROM

*

). Therefore, the diagnosis code will not be 

erased even when the battery terminal is discon-
nected. The diagnosis code can be erased using 
M.U.T.-III.

NOTE: 

.

•

*

: EEPROM (Electrical Erasable & Programmable 

Read Only Memory): ROM that can be pro-
grammed or erased electrically

•

For each diagnosis item, refer to Workshop Man-
ual.

DATA LIST OUTPUT

Using M.U.T.-III, the service data can be read.

NOTE: For service data items, refer to Workshop 
Manual.

ACTUATOR TEST

Using M.U.T.-III, the actuator can be forcibly oper-
ated. For the actuator test specification, refer to 
Workshop Manual.

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SYSTEM CONSTRUCTION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-15

SRS AIR BAG SPECIAL CONNECTOR

M2521009001027

To enhance the system reliability, a connector short 
circuiting mechanism is integrated in the SRS-ECU 
connector, air bag module connectors, clock spring 
connector, and pre-tensioner connectors (black con-
nector "A" shown in the figure).

CONNECTOR SHORT-CIRCUIT MECHANISM

This mechanism prevents the improper deployment 
of air bag module because of the current application 
to the squib due to the static electricity when connec-
tors between SRS-ECU and air bag modules 
(squibs) are disconnected. When the connector is 

disconnected, the short spring short circuits the (+) 
and (-) of squibs, and prevents the static electricity 
from generating the potential difference. This con-
nector mechanism is adopted for the following con-
nectors.

• SRS-ECU connector

AC607646 AI

SRS-ECU

A

A

A

A

A

A

A

A

A

A

Clock spring

Side-airbag module (RH)

Seat belt pre-tensioner (LH)

Side-airbag module (LH)

Seat belt pre-tensioner (RH)

Passenger's (front) air bag module

Driver's air bag module

Curtain air bag module (RH)

Curtain air bag module (LH)

Lap pre-tensioner

A

A

AC507316

SRS-ECU connector

AB

Partition panel
(SRS-ECU-side 
connector)

Partition panel

Wiring harness-side connector 
(terminal to short-circuit)

Short spring

Short spring 
(wiring harness-side 
connector)

Connector connected

Wiring harness-side connector

Terminal to short-circuit

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