Mitsubishi Outlander (2003+). Manual - part 356

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-23

DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes are set when a fault is 
detected in the SRS-ECU. The most likely causes for 
this code to be set are shown in the table below:

PROBABLE CAUSE
Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE
Replace the SRS-ECU (Refer to 

P.52B-178

).

Code No.

Part/Circuit integral to 
SRS-ECU

Trouble causes

14

Analog G-sensor

•

When the analog G-sensor is not operating

•

When the characteristics of the analog G-sensor are 
abnormal

•

When the output from the analog G-sensor is 
abnormal

15

Safing G-sensor (for frontal 
collision)

•

Short circuit in the safing G-sensor

16

•

Open circuit in the safing G-sensor

17

Safing G-sensor (for side 
collision)

•

When the safing G-sensor is not operating

•

When the characteristics of the safing G-sensor are 
abnormal

•

When the output from the safing G-sensor is abnormal

31

Capacitor circuit

•

Voltage at the capacitor terminal is higher than the 
specified value for five seconds or more

32

•

Voltage at the capacitor terminal is lower than the 
specified value for five seconds or more (This is not 
detected if diagnosis code No.41 or 42 indicating 
battery positive voltage drop has been output).

45

Non-volatile memory (EEPROM) 
and A/D converter

•

When the non-volatile memory (EEPROM) and A/D 
converter system are abnormal

51

Driver's air bag module (squib 
ignition drive circuit)

•

Short circuit in the squib ignition drive circuit

52

•

Open circuit in the squib ignition drive circuit

54

Front passenger's air bag module 
(squib ignition drive circuit)

•

Short circuit in the squib ignition drive circuit

55

•

Open circuit in the squib ignition drive circuit

56

Driver’s seat belt pre-tensioner 
(squib ignition drive circuit)

•

Short circuit in the squib ignition drive circuit

57

•

Open circuit in the squib ignition drive circuit

58

Passenger’s seat belt 
pre-tensioner (squib ignition drive 
circuit)

•

Short circuit in the squib ignition drive circuit

59

•

Open circuit in the squib ignition drive circuit

73

Side air bag module (RH) (squib 
ignition drive circuit)

•

Short circuit in the squib ignition drive circuit

74

•

Open circuit in the squib ignition drive circuit

83

Side air bag module (LH) (squib 
ignition drive circuit)

•

Short circuit in the squib ignition drive circuit

84

•

Open circuit in the squib ignition drive circuit

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-24

Code No.21: Driver's 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 driver's 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).

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-25

PROBABLE CAUSES

•

Improper engaged connector or defective short 
spring*

•

Short circuit in the clock spring

•

Short circuit between the driver'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, C-307 or C-306 is 
damaged or improperly engaged, the short spring 
may not be released when the connector is 
connected.

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 7.

STEP 3. Connector check: SRS-ECU connector 
C-115, clock spring connector C-307 and driver’s 
air bag module connector C-306 (Check whether 
the diagnosis code is reset.)
(1) Disconnect the negative battery terminal.

(2) Disconnect connectors C-115, C-307 and C-306, 

and then reconnect them.

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

AC301399

Connectors: C-306, C-307 <LHD>

Clock spring

C-307 (Y)

C-306 

AI

Harness side
connector
(front view)

3

4

2 1

C-307

2

1

C-306

AC308779

C-306

C-307 (Y)

Connectors: C-306, C-307 <RHD>

AB

C-306

C-307

Clock spring

Harness side
connector
(front view)

Harness side
connector
(front view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-26

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

diagnosis code.

Q: Is diagnosis code 21 set?

YES : 

Go to Step 4.

NO : 

The procedure is complete. It is assumed 
that diagnosis code 21 set as connector 
C-115, C-307 or C-306 was engaged 
improperly.

STEP 4. 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 21 set?

YES : 

Go to Step 5.

NO : 

Replace the driver's air bag module (Refer 
to 

P.52B-179

). Then go to Step 7.

STEP 5. 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).

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 

harness side connector C-307 (terminal No.3 and 
4) by backprobing.

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

diagnosis code.

Q: Is diagnosis code 21 set?

YES : 

Go to Step 6.

NO : 

Replace the clock spring (Refer to 

P.52B-179

). Then go to Step 7.

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)