Mitsubishi Outlander (2013+). Manual - part 610

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-91

Code No.B1606 Seat belt pre-tensioner (driver’s side) (squib) system (shorted to squib circuit power 
supply)

CAUTION

If the diagnosis code B1606 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 SRS-ECU seat belt 
pre-tensioner (driver’s side) (squib) circuit is shorted 
to power supply.

PROBABLE CAUSES

• Damaged wiring harness and connector

• Seat belt pre-tensioner (driver’s side) (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. B1606 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 (driver's side) 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 special tool resistor harness to the seat 

belt pre-tensioner (driver'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. B1606 set?

YES : 

Go to Step 4.

NO : 

Replace the seat belt with pre-tensioner 
(driver’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 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-92

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 (driver's side) harness side 

connector. 

AC905468AU

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

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1606 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 ).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-93

Code No.B1609 Seat belt pre-tensioner (passenger’s side) (squib) system (short circuit between 
squib circuit terminals)

CAUTION

If the diagnosis code B1609 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 ignition signal is sent from 
SRS-ECU to the seat belt pre-tensioner (squib).

TROUBLE JUDGEMENT

The code is set when the short circuit occurs to 
between the terminals of SRS-ECU seat belt pre-ten-
sioner (passenger’s side) (squib) circuit.

PROBABLE CAUSES

• Damaged short spring 

*

• Short circuit between terminals of seat belt 

pre-tensioner (passenger’s side) (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 seat belt pre-ten-
sioner 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 connector 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. B1609 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, seat belt 
pre-tensioner (passenger's side).
(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 
connector, connect it again.

ACC00046AB

Locking button

Flat-tipped
screwdriver

Seat belt pre-tensioner 
harness side connector

(3)  After disconnecting the seat belt pre-tensioner 

(passenger's side) harness side connector, 
connect the connector again. For the seat belt 
pre-tensioner (passenger's side) 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.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-94

Q: Is the diagnosis code No. B1609 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.

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 
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 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. B1609 set?

YES : 

Go to Step 5.

NO : 

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

P.52B-147

).

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 
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-