Mitsubishi Outlander (2013+). Manual - part 596

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-35

Code No.B1412 Passenger's (front) air bag module (squib) system (shorted to squib circuit earth)

CAUTION

• If the diagnosis code B1412 (squib) is set to 

SRS-ECU, be sure to diagnose the CAN bus 
line.

• Follow the diagnosis procedure below. If diag-

nosis code B1412 is set, check squib side cir-
cuit..

OPERATION

Only when the frontal impact exceeding the threshold 
is simultaneously detected (turned ON) by the front 
impact sensor as well as by the analogue G-sensor 
in SRS-ECU, the electric current is supplied from 
SRS-ECU to the passenger's (front) air bag module 
(squib).

TROUBLE JUDGEMENT

The code is set when the SRS-ECU passenger's 
(front) air bag module (squib) circuit is shorted to 
earth.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Passenger's (front) air bag module (squib) har-

ness shorted to earth

• Malfunction of SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. Check whether the diagnosis code is 
reset.
(1) Connect the negative battery terminal.
(2) After erasing the diagnosis code memory, check 

the diagnosis code again.

(3) Disconnect the negative battery terminal.

Q: Are diagnosis codes No. B1412 set?

YES : 

Go to Step 3.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

STEP 3. Diagnosis check by dummy resistor 
connection.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 
connected, disconnect it.

ACB04307AB

Passenger's air bag module 

harness side connector

Locking button

Flat-tipped
screwdriver

(2) Use the flat-tipped screwdriver to pull out the 

locking button of wiring harness side connector, 
and release the lock.

AC306760BA

MB991865
(Dummy resistor: 3    )

MB991866 
(Resistor harness)

Harness 

side connector

Passenger's (front) 

air bag module connector

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

CAUTION

Do not insert a probe directly into the terminal 
from the connector front side as the connector 
contact pressure may be weakened.
(4) Insert the resistor harness probe from the back of 

harness side connector ASQ+, ASQ- line.

(5) Connect the negative battery terminal.
(6) After erasing the diagnosis code memory, check 

the diagnosis code again.

(7) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1412?

YES : 

Go to Step 4.

NO : 

Replace the passenger's (front) air bag 
module (Refer to 

P.52B-136

).

STEP 4. Resistance measurement at the  
SRS-ECU connector.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-36

connected, disconnect it.

AC905015

A

AC

Lock lever

(2) While pushing the part "A" indicated in the figure 

of the harness side connector, turn the lock lever 
to the direction of the arrow to release the lock 
lever, and disconnect the SRS-ECU connector.

DANGER

To release the connector short spring in the 
following operations, disconnect this har-
ness side connector, and keep the squib cir-
cuit shorted.

ACB04307AB

Passenger's air bag module 

harness side connector

Locking button

Flat-tipped
screwdriver

(3) Use the flat-tipped screwdriver to pull out the 

locking button of wiring harness side connector, 

and release the lock.

AC905150 AQ

A

A

Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

CAUTION

The short spring may not be released due to the 
insufficient insertion. Therefore, insert the insu-
lator for 4 mm or more.
(4) Insert an insulator (width: 3 mm, thickness: 0.5 

mm) such as cable tie between the ASQ+, ASQ- 
line, and then release the short spring.

(5) Take the measurements below at the passenger's 

(front) air bag module harness side connector.

• Continuity between ASQ+, ASQ- line and 

body earth

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair ASQ+, ASQ- line between the 
SRS-ECU connector and the passenger's 
(front) air bag module connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1412 set?

YES : 

Replace SRS-ECU (Refer to 

P.52B-129

).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B1413 Passenger's (front) air bag module (squib) system (shorted to squib circuit power 
supply)

CAUTION

• If the diagnosis code B1413 is set to 

SRS-ECU, be sure to diagnose the CAN bus 
line.

• Follow the diagnosis procedure below. If diag-

nosis code B1413 is set, check squib side cir-
cuit

OPERATION

Only when the frontal impact exceeding the threshold 
is simultaneously detected (turned ON) by the front 
impact sensor as well as by the analogue G-sensor 
in SRS-ECU, the electric current is supplied from 
SRS-ECU to the passenger's (front) air bag module 
(squib).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-37

TROUBLE JUDGEMENT

The code is set when the input terminal of SRS-ECU 
passenger's (front) air bag module (squib) shorted to 
power supply.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Passenger's (front) air bag module (squib) har-

ness shorted to power supply

• Malfunction of SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. Check whether the diagnosis code is 
reset.
(1) Connect the negative battery terminal.
(2) After erasing the diagnosis code memory, check 

the diagnosis code again.

(3) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1413 set?

YES : 

Go to Step 3.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

STEP 3. Diagnosis check by dummy resistor 
connection.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 
connected, disconnect it.

ACB04307AB

Passenger's air bag module 

harness side connector

Locking button

Flat-tipped
screwdriver

(2) Use the flat-tipped screwdriver to pull out the 

locking button of wiring harness side connector, 
and release the lock.

AC306760BA

MB991865
(Dummy resistor: 3    )

MB991866 
(Resistor harness)

Harness 

side connector

Passenger's (front) 

air bag module connector

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

CAUTION

Do not insert a probe directly into the terminal 
from the connector front side as the connector 
contact pressure may be weakened.
(4) Insert the resistor harness probe from the back of 

harness side connector ASQ+, ASQ- line.

(5) Connect the negative battery terminal.
(6) After erasing the diagnosis code memory, check 

the diagnosis code again.

(7) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1413 set?

YES : 

Go to Step 4.

NO : 

Replace the passenger's (front) air bag 
module (Refer to 

P.52B-136

).

STEP 4. Voltage measurement at the SRS-ECU 
connector.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 
connected, disconnect it.

AC905015

A

AC

Lock lever

(2) While pushing the part "A" indicated in the figure 

of the harness side connector, turn the lock lever 
to the direction of the arrow to release the lock 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-38

lever, and disconnect the SRS-ECU connector.

DANGER

To release the connector short spring in the 
following operations, disconnect this har-
ness side connector, and keep the squib cir-
cuit shorted.

ACB04307AB

Passenger's air bag module 

harness side connector

Locking button

Flat-tipped
screwdriver

(3) Use the flat-tipped screwdriver to pull out the 

locking button of wiring harness side connector, 
and release the lock.

AC905150 AQ

A

A

Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

CAUTION

The short spring may not be released due to the 
insufficient insertion. Therefore, insert the insu-
lator for 4 mm or more.
(4) Insert an insulator (width: 3 mm, thickness: 0.5 

mm) such as cable tie between the ASQ+, ASQ- 
line, and then release the short spring.

(5) Connect the negative battery terminal.
(6) Ignition switch: ON
(7) Take the measurements below at the SRS-ECU 

harness side connector.

• Continuity between ASQ+, ASQ- line and 

body earth

OK: 1 V or less

(8) Disconnect the negative battery terminal.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair ASQ+, ASQ- line between the 
SRS-ECU connector and the passenger's 
(front) air bag module connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1413 set?

YES : 

Replace SRS-ECU (Refer to 

P.52B-129

).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B1417: Front impact sensor (LH) voltage error

CAUTION

If diagnosis code B1417 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

OPERATION

The front impact sensor (LH) transmits acceleration 
data to the SRS-ECU. The SRS-ECU then deter-
mines whether to operate the front air bags, and then 
outputs an ignition signal when necessary. The front 
impact sensor (LH) also diagnoses itself, and sends 
a diagnosis code to the SRS-ECU if a malfunction 
occurs.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code will set when the power supply 
voltage to the front impact sensor (LH) remains less 
than a predetermined value for one second.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the front impact sensor (LH)

• Malfunction of the SRS-ECU