Mitsubishi Outlander (2003+). Manual — part 358

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-31

Code No.24: Passenger's (front) air bag module (squib) system (short-circuited between terminals of
the squib circuit)

OPERATION

•

The SRS-ECU judges how severe a collision is
by detecting signals from the front impact sensors
and the front air bag analog G-sensor. If the
impact is over a predetermined level, the
SRS-ECU outputs an ignition signal. At this time,
if the front air bag safing G-sensor is on, the SRS
air bag will inflate.

•

The ignition signal is input to the air bag module
via the clock spring to inflate the air bag.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one passenger’s (front)
air bag squib wire shorted to the other. However, if no
diagnosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).

PROBABLE CAUSES

•

Improper engaged connector or defective short
spring*

•

Short circuit between the passenger's air bag
module (squib) circuit terminals

•

Damaged connector(s)

•

Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the earth wire in the
squib circuit when the connectors are
disconnected).Therefore, if connector C-115 or C-09
is damaged or improperly engaged, the short spring
may not be released when the connector is
connected.

AIR BAG DRIVE
CIRCUIT

CONNECTOR
LOCK
SWITCH

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

CONNECTOR
LOCK
SWITCH

MICROCOMPUTER

SRS-ECU

AIR BAG MODULE
(SQUIB)
(PASSENGER'S
SIDE)

Wire colour code
B : Black LG : Light green
G : Green L : Blue
W : White Y : Yellow
SB : Sky blue BR : Brown
O : Orange GR : Gray
R : Red P : Pink V : Violet

AC301794

Passenger's (Front) Air Bag Module (Squib) Circuit

AB

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-32

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III diagnosis code

CAUTION

To prevent damage to MUT-II/III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-II/III.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the diagnosis code is set.
(3) Turn the ignition switch to the "LOOK" (OFF)

position.

Q: Is diagnosis code 34 set?

YES :

Go to Step 2.

NO :

Go to Step 3.

STEP 2. Connector check: SRS-ECU connector
C-115

Q: Is the connector correctly engaged?

YES :

Go to Step 3.

NO :

Engage the connector correctly. Then go to
Step 6.

STEP 3. Connector check: SRS-ECU connector
C-115 and passenger’s air bag module connector
C-09 (Check whether the diagnosis code is
reset.)
(1) Disconnect the negative battery terminal.

(2) Disconnect connectors C-115 and C-09, and then

reconnect them.

(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the

diagnosis code.

Q: Is diagnosis code 24 set?

YES :

Go to Step 4.

NO :

The procedure is complete. It is assumed
that diagnosis code 24 set as connector
C-115 or C-09 was engaged improperly.

AC301661AC

Harness side
connector
(front view)

Connector: C-115

SRS-ECU

C-115 (Y)

Center lower
panel

1110 9

1

2

3

1413

12

4

5

6

16

8

15

7

17

18

19

20

AC301661AC

Harness side
connector
(front view)

Connector: C-115

SRS-ECU

C-115 (Y)

Center lower
panel

1110 9

1

2

3

1413

12

4

5

6

16

8

15

7

17

18

19

20

AC301718

Connector: C-09 <LHD>

AD

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

AC309254 AB

Connector: C-09 <RHD>

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-33

STEP 4. Check the passenger's air bag module.
(Check whether the diagnosis code is reset.)
(1) Disconnect the negative battery terminal.

(2) Unclip passenger’s air bag module connector

C-09.

(3) Connect special tool dummy resistor (MB991865)

to special tool resistor harness (MB991866).

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Disconnect the passenger's air bag module

connector C-09 and insert special tool
(MB991866) into the harness side connector by

backprobing.

(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the

diagnosis code.

Q: Is diagnosis code 24 set?

YES :

Go to Step 5.

NO :

Replace the passenger's air bag module
(Refer to

P.52B-179

). Then go to Step 6.

STEP 5. Measure the resistance at SRS-ECU
connector C-115.

(1) Disconnect SRS-ECU connector C-115.

(2) Unclip passenger’s air bag module connector

C-09.

AC301718

Connector: C-09 <LHD>

AD

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

AC309254 AB

Connector: C-09 <RHD>

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

AC300956AB

MB991865 (Dummy
resistor : 3

Ω)

C-09 Harness side
connector

C-09 Passenger's
air bag module connector

MB991866
(Resistor harness)

AC301661AC

Harness side
connector
(front view)

Connector: C-115

SRS-ECU

C-115 (Y)

Center lower
panel

1110 9

1

2

3

1413

12

4

5

6

16

8

15

7

17

18

19

20

AC301718

Connector: C-09 <LHD>

AD

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

AC309254 AB

Connector: C-09 <RHD>

C-09 (R)

Glove box striker

2 1

Harness side
connector (front view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-34

DANGER

To prevents the air bag from deploying
unintentionally, disconnect the passenger’s
air bag module connector C-09 to short the
squib circuit.

(3) Disconnect the passenger's air bag module

connector C-09.

CAUTION

Insert an insulator such as a cable tie to a depth
of 4 mm or more, otherwise the short spring will
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick]

between terminals 9, 10 and the short spring to
release the short spring.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Measure the resistance between C-115 harness

side connector terminals 9 and 10.

OK: Open circuit

Q: Is the check result normal.

YES :

Erase the diagnosis code memory, and

check the diagnosis code. If diagnosis code
24 sets, replace the SRS-ECU (Refer to

P.52B-178

). Then go to Step 6 .

NO :

Repair the harness wires between
SRS-ECU connector C-115 (terminal No.9
and 10) and passenger’s air bag module
connector C-09 (terminal No.1 and 2). Then
go to Step 6.

STEP 6. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 24 set?

YES :

Return to Step 1.

NO :

The procedure is complete. (If no
malfunctions are found in all steps, an
intermittent malfunction is suspected. Refer
to GROUP 00

−

How to Use

Troubleshooting/Inspection Service Points

P.00-6

).

AC300958

Section
A - A

C-115 Harness side
connector (front view)

Cable tie

Short spring

4 mm or more

Terminal

AB

A

A

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC300971AB

C-115 Harness side
connector
(rear view)