Mitsubishi Outlander (2003+). Manual - part 369

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-75

STEP 8. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 41 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

).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-76

Code No.42: Power supply voltage (IG1 (B) voltage) drops abnormally.

OPERATION

•

The SRS-ECU is powered from the ignition 
switch (IG1).

•

The SRS-ECU power is supplied from two 
circuits. Even if one circuit is shut off, the air bag 
can inflate.

IGNITION 
SWITCH (IG1)

SRS-ECU

POWER SOURCE
CIRCUIT

BACK-UP
CAPACITOR

D.C.-D.C.
CONVERTER

MICROCOMPUTER

CONNECTOR
LOCK
SWITCH

WARNING LAMP 
DRIVE CIRCUIT

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

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       

COMBINATION 
METER

AC301798

IG1 Power Supply Circuit System (Fuse No.3 Circuit)

AC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-77

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the voltage between the 
IG1 terminals (fuse No.3 circuit) and earth is lower 
than a predetermined value for a continuous period 
of 5 second or more. However, if the vehicle 
condition returns to normal, diagnosis code number 
42 will be automatically erased, and the SRS 
warning lamp will switch off.

PROBABLE CAUSES

•

Damaged wiring harnesses or connectors

•

Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check junction block fuse number 3.

Q: Is the fuse burned out?

YES : 

Go to Step 4.

NO : 

Go to Step 2.

STEP 2. Measure the voltage at SRS-ECU 
connector C-115.
(1) Disconnect the negative battery terminal.

(2) Disconnect SRS-ECU connector C-115.
(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

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 voltage between C-115 harness 

side connector terminal 13 and body earth.

OK: 9 V or more

Q: Is the check result normal?

YES : 

Erase the diagnosis connector memory, and 

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

P.52B-178

). Then go to Step 8.

NO : 

Go to Step 3.

AC201425AE

Junction
block

Fuse No.3

<LHD>

AC309274

AB

Fuse No.3

Junction block

<RHD>

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

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC301016 AB

C-115 Harness side
connector (rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-78

STEP 3. Connector check: SRS-ECU connector 
C-115, ignition switch connector C-303, junction 
block connector C-203 and C-205

Q: Is the check result normal?

YES : 

Check the harness wire for open circuit 

between SRS-ECU connector C-115 
(terminal No.13) and the ignition switch 
connector C-303 (terminal No.2), and repair 
if necessary. Then go to Step 8.

NO : 

Repair or replace it. Then go to Step 8.

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-303

Clock spring

C-303

AK

Harness side
connector
(front view)

2
5

6

3

4

1

<LHD>

AC308778

Connector: C-303 <RHD>

Clock spring

AG

Harness side

2
5

6

3

4

1

AC210475

Connectors: C-203, C-205 <LHD>

BC

Junction Block (Front View)

C-205

C-203

Harness side

C-203

C-205

4

6 5

3

2

1

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

AC308773

Connectors: C-203, C-205 <RHD>

AK

Junction Block (Front View)

C-205

C-203

Harness side

C-203

C-205

4

6 5

3

2

1

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

Harness side