Mitsubishi Outlander (2003+). Manual - part 357

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-27

STEP 6. Measure the resistance at the SRS-ECU 
connector C-115.

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

DANGER

To prevents the air bag from deploying 
unintentionally, disconnect the clock spring 
connector C-307 to short the squib circuit.

(2) Disconnect the clock spring connector C-307.

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.
(3) Insert a cable tie [3 mm wide, 0.5 mm thick] 

between terminals 11, 12 and the short bar 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.
(4) Measure the resistance between C-115 harness 

side connector terminals 11 and 12.

OK: Open circuit

Q: Is the check result normal.

YES : 

Erase the diagnosis code memory, and 

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

P.52B-178

). Then go to Step 7 .

NO : 

Repair the harness wires between 
SRS-ECU connector C-115 (terminal No.11 
and 12) and clock spring connector C-307 
(terminal No.3 and 4). Then go to Step 7.

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

AC301399

Connector: C-307<LHD>

Clock spring

C-307 (Y)

AJ

Harness side
connector
(front view)

3

4

2 1

AC308778

Connector: C-307 <RHD>

AF

C-307 (Y)

Clock spring

Harness side
connector
(front view)

AC300951

Section
A - A

C-115 Harness side connector
(front view)

Cable tie

Short spring

4 mm or more

Terminal

A

A

AB

AC300953 AB

C-115 Harness side
connector (rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-28

STEP 7.  Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 21 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

).

Code No.22: Driver's 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.

CLOCK
SPRING

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

CONNECTOR
LOCK
SWITCH

AIR BAG
DRIVE CIRCUIT

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

SRS-ECU

MICROCOMPUTER

CONNECTOR
LOCK
SWITCH

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   

AC301790

Driver's Air Bag Module (Squib) Circuit

AB

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-29

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if driver’s 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 clock spring

•

Open circuit due to improper neutral position of 
the clock spring

•

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

•

Disengaged driver's air bag module (squib) 
connector

•

Improper connector contact

•

Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

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

(2) By sliding the A section (in the figure) of air bag 

module connector C-306 in the arrow direction, 

disconnect the connector.

(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) Insert special tool (MB991866) into clock spring 

side air bag module connector C-306 by 
backprobing.

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

diagnosis code.

Q:  Is diagnosis code 22 set?

YES : 

Go to Step 2.

NO : 

Replace the driver's air bag module (Refer 
to 

P.52B-179

). Then go to Step 4.

STEP 2. Check the clock spring. (Check whether 
the diagnosis code is reset.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the clock spring connector C-307.

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

AC300156AB

A

C-306 Air bag
module connector

Steering wheel

AC303006AC

MB991865
(Dummy resistor : 3

Ω)

MB991866
(Resistor harness)

C-306 Air bag 
module
connector

AC303587AC

1 2

4

3

MB991865 (Dummy
resistor : 3 

Ω)

MB991866
(Resistor harness)

C-307 Clock spring
connector

(Rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-30

STEP 3. Measure the resistance between the 
SRS-ECU connector C-115 (terminal No.11 and 
12) and the clock spring connector C-307 
(terminal No.3 and 4).

(1) Disconnect SRS-ECU connector C-115 and clock 

spring connector C-307.

CAUTION

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

terminals.

•

SRS-ECU connector C-115 terminal No.11 
and the clock spring connector C-307 terminal 
No.3

•

SRS-ECU connector C-115 terminal No.12 
and the clock spring connector C-307 terminal 
No.4

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 
22 sets, replace the SRS-ECU (Refer to 

P.52B-178

). Then go to Step 4   .

NO : 

Repair the harness wires between 
SRS-ECU connector C-115 (terminal No.11 
and 12) and clock spring connector C-307 
(terminal No.3 and 4). Then go to Step 4.

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 22 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

AC301399

Connector: C-307

Clock spring

C-307 (Y)

AF

Harness side
connector
(front view)

3

4

2 1

AC308778

Connector: C-307 <RHD>

AF

C-307 (Y)

Clock spring

Harness side
connector
(front view)

1 2

4

3

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC300955

C-115 Harness 
side connector
(rear view)

C-307 Harness 
side connector
(rear view)

AB