Mitsubishi Outlander (2003+). Manual — part 359

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-35

Code No.25: Passenger's (front) air bag module (squib) system (open-circuited in 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 passenger’s (front) air
bag squib wire(s) are open-circuited. However, if no
diagnosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).

PROBABLE CAUSES

•

Open circuit in the passenger's air bag module
(squib) circuit

•

Improper connector contact

•

Malfunction of the SRS-ECU

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-36

DIAGNOSIS PROCEDURE

STEP 1. 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 25 set?

YES :

Go to Step 2.

NO :

Replace the passenger's air bag module
(Refer to

P.52B-179

). Then go to Step 3.

STEP 2. Measure the resistance between
SRS-ECU connector C-115 (terminal No.9 and 10)
and the passenger's air bag module connector
C-09 (terminal No.1 and 2).

(1) 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)

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-37

(2) Disconnect SRS-ECU connector C-115 and

passenger's air bag module connector C-09.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(3) Measure the resistance between the following

terminals.

•

SRS-ECU connector C-115 terminal No.9 and
the passenger’s air bag module connector
C-09 terminal No.1

•

SRS-ECU connector C-115 terminal No.10
and the passenger’s air bag module
connector C-09 terminal No.2

OK: Less than 2

Ω

Q: Are the check results normal?

YES :

Erase the diagnosis code memory, and

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

P.52B-178

). Then go to Step 3 .

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 3.

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 25 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

).

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

1 2

1 2

3 4

5 6 7 8 9 10 11 12

13 14 15 16

18 19 20

17

AC300973

C-115 Harness side
connector (rear view)

C-09 Harness side
connector (rear view)

AB

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-38

Code No.26: Driver's pre-tensioner (squib) system (short-circuited between terminals of the squib
circuit) <L.H. drive vehicles>

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 pre-tensioner will deploy.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one driver’s
pre-tensioner squib wire shorted to the other.

PROBABLE CAUSES

•

Improper engaged connector or defective short
spring*

•

Short circuit between the driver's seat belt
pre-tensioner (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-114 or D-29 is damaged or
improperly engaged, the short spring may not be
released when the connector is connected.

SEAT BELT
PRETENSIONER
(LH)

CONNECTOR
LOCK
SWITCH

AIR BAG
DRIVE CIRCUIT

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

SRS-ECU

MICROCOMPUTER

CONNECTOR
LOCK
SWITCH

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

AC301789AB

Driver's Seat Belt Pre-Tensioner (Squib)