Mitsubishi Outlander (2013+). Manual - part 612

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-99

line, and the short spring, and release the short 
spring.

(5) Take the measurements below at the SRS-ECU 

harness side connector.

• Continuity between PTA+, PTA- line and body 

earth

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness PTA+, PTA- line 
between the SRS-ECU connector and the 
seat belt pre-tensioner (passenger's side) 
connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1C47 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.B1612 Seat belt pre-tensioner (passenger’s side) (squib) system (shorted to squib circuit 
power supply)

CAUTION

If the diagnosis code B1612 is set to SRS-ECU, 
be sure to diagnose the CAN bus line.

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 seat belt pre-tensioner (squib).

TROUBLE JUDGEMENT

The code is set when the input terminal of SRS-ECU 
seat belt pre-tensioner (passenger’s side) (squib) is 
shorted to power supply.

PROBABLE CAUSES

• Damaged wiring harness and connector

• Seat belt pre-tensioner (passenger’s side) (squib) 

harness 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. B1612 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.

ACC00046AB

Locking button

Flat-tipped
screwdriver

Seat belt pre-tensioner 
harness side connector

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

locking button of harness side connector. After 
releasing the lock, disconnect the seat belt 
pre-tensioner (passenger's side) harness side 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-100

connector. 

AC301553DR

Harness side 
connector

MB991865

(Dummy resistor: 3    )

MB991884 

(Resistor harness)

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991884).

(4) Connect the special tool resistor harness to the 

seat belt pre-tensioner (passenger's side) 
harness side connector.

(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. B1612 set?

YES : 

Go to Step 4.

NO : 

Replace the seat belt with pre-tensioner 
(passenger’s side) (Refer to 

P.52B-147

).

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 

lever, and disconnect the SRS-ECU connector.

DANGER

To release the SRS-ECU connector short 
spring in the following operations, discon-
nect this seat belt pre-tensioner connector, 
and keep the squib circuit shorted.

ACC00046AB

Locking button

Flat-tipped
screwdriver

Seat belt pre-tensioner 
harness side connector

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

locking button of harness side connector. After 
releasing the lock, disconnect the seat belt 
pre-tensioner (passenger's side) harness side 
connector.

AC905468AV

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 PTA+, PTA- 
line, and the short spring, and 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.

• Voltage between PTA+, PTA- line and body 

earth

OK: 1 V or less

(8) Disconnect the negative battery terminal.

Q: Is the check result normal?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-101

YES : 

Go to Step 5.

NO : 

Repair the wiring harness PTA+, PTA- line 
between the SRS-ECU connector and the 
seat belt pre-tensioner (passenger's side) 
connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1612 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.B1631 Driver's knee air bag module (squib) system (short circuit between squib circuit 
terminals)

CAUTION

If the diagnosis code B1631 is set to SRS-ECU, 
be sure to diagnose the CAN bus line.

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 knee air bag module (squib).

TROUBLE JUDGEMENT

The code is set when the short circuit occurs to 
between the terminals of SRS-ECU knee air bag 
module (squib) circuit.

PROBABLE CAUSES

• Damaged short spring 

*

• Short circuit between terminals of knee air bag 

module (squib) circuit

• Damaged connector(s)

• Malfunction of SRS-ECU

• Insufficient press of locking button or locking but-

ton not pressed

NOTE: *: The squib circuit connectors integrate a 
short spring (which prevents the air bags from being 
unintentionally deployed because of static electricity 
by shorting the positive wire to the earth wire in the 
squib circuit when the connectors are disconnected). 
Therefore, when the above codes are set, the short 
spring may not be released due to the damaged con-
nector even when the connectors are connected.

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. B1631 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. Connector check: SRS-ECU, knee air 
bag module.
(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 
lever. After disconnecting the SRS-ECU 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-102

connector, connect it again.

AC609126AF

Locking button

Flat-tipped
screwdriver

Inflator

Harness side
connector

(3)  After disconnecting the knee air bag module 

harness side connector, connect the connector 
again. For the knee air bag module harness side 
connector disconnection, use the flat-tipped 
screwdriver to pull out the harness side 
connector locking button. After releasing the lock, 
disconnect the harness side connector.

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

the diagnosis code again.

(6) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1631 set?

YES : 

Go to Step 4.

NO : 

Replace the connector concerned.

STEP 4. Diagnosis check by dummy resistor 
connection.
(1) Check that the negative battery terminal is 

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

AC609126AF

Locking button

Flat-tipped
screwdriver

Inflator

Harness side
connector

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

locking button of harness side connector. After 

releasing the lock, disconnect the knee air bag 
module harness side connector. 

AC301553DR

Harness side 
connector

MB991865

(Dummy resistor: 3    )

MB991884 

(Resistor harness)

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991884).

(4) Connect the resistor harness to the knee air bag 

module harness side connector.

(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. B1631 set?

YES : 

Go to Step 5.

NO : 

Replace the driver’s knee air bag module 
(Refer to 

P.52B-139

).

STEP 5. Resistance check 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