Mitsubishi Outlander (2013+). Manual - part 602

 

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Mitsubishi Outlander (2013+). Manual - part 602

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-59

lever, and disconnect the SRS-ECU connector.

DANGER

To release the connector short spring in the 
following operations, disconnect this 
side-airbag module connector, and keep the 
squib circuit shorted.

AC706606

AC

Locking button

Side-airbag module
connector

(3) Disconnect the left side-airbag module connector, 

unlock the connector by sliding the locking button 
to the direction of the arrow as shown in the 
figure, and then disconnect the connector.

AC905468AS

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

• Voltage between SLS-, SLS+ 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 SLS-, SLS+ line 
between the SRS-ECU connector and the 
left side-airbag module connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1433 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.B1437: Side impact sensor (LH) voltage error

CAUTION

If diagnosis code B1437 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

OPERATION

The side impact sensor transmits acceleration data 
to the SRS-ECU. The SRS-ECU then determines. if 
the side and/or curtain air bags should be inflated, 
and then sends an ignition signal. The side impact 
sensor also diagnoses itself, and sends a diagnosis 
code to the SRS-ECU if a problem occurs.

DIAGNOSIS CODE SET CONDITIONS

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

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the side impact sensor (LH)

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-60

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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, Diagnosis ).

STEP 2. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: "LOCK" (OFF) position to "ON"
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the diagnosis code set?

YES : 

Go to Step 3.

NO : 

There is an intermittent malfunction such as 
poor engaged connector(s) or open circuit 
(Refer to GROUP 00, How to Cope with 
Intermittent Malfunction ).

STEP 3. Check of short to power supply, short to 
earth, and open circuit in SSL+, SSL- line in 
between SRS-ECU connector and side impact 
sensor (LH) connector.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connectors or harness wires.

STEP 4. Check the side impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the side impact sensor (LH) and the 

side impact sensor (RH), and then install the 
alternated sensor.

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

check the diagnosis code.

Q: Is diagnosis code B1427 set?

YES : 

Replace the side impact sensor (LH) with a 

new one (Refer to 

P.52B-127

).

NO : 

Go to Step 5.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1437 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-129

).

NO : 

An intermittent malfunction is suspected 
(Refer to GROUP 00, How to Cope with 
Intermittent Malfunction ).

Code No.B1438 Side impact sensor (LH) communication error

 

Code No.B1439 Side impact sensor (LH) communication impossible

CAUTION

If the diagnosis code B1438 or B1439 is set to 
SRS-ECU, be sure to diagnose the CAN bus line.

OPERATION

The side impact sensor transmits acceleration data 
to the SRS-ECU. The SRS-ECU then determines. if 
the side and/or curtain air bags should be inflated, 
and then sends an ignition signal. The side impact 
sensor also diagnoses itself, and sends a diagnosis 
code to the SRS-ECU if a problem occurs.

DIAGNOSIS CODE SET CONDITIONS

The diagnosis code is set if the communication 
between the left side impact sensor and SRS-ECU is 
abnormal (No. B1438), or impossible (No. B1439).

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the side impact sensor (LH)

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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, Diagnosis ).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-61

STEP 2. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: "LOCK" (OFF) position to "ON"
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the diagnosis code set?

YES : 

Go to Step 3

NO : 

There is an intermittent malfunction such as 
poor engaged connector(s) or open circuit 
(Refer to GROUP 00, How to Cope with 
Intermittent Malfunction ).

STEP 3. Check the side impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the side impact sensor (LH) and the 

side impact sensor (RH), and then install the 
alternated sensor.

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

the diagnosis code.

Q: Is diagnosis code B1438 or B1439 set?

YES : 

Replace the side impact sensor (LH) with a 

new one (Refer to 

P.52B-127

). Go to Step 5.

NO : 

Go to Step 4

STEP 4. Check of short to power supply, short to 
earth, and open circuit in SSL+, SSL- line in 
between SRS-ECU connector and side impact 
sensor (LH) connector..

Q: Is the check result normal?

YES : 

Go to Step 5

NO : 

Repair the connectors or harness wires.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1438 or B1439 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-129

).

NO : 

An intermittent malfunction is suspected 
(Refer to GROUP 00, How to Cope with 
Intermittent Malfunction ).

Code No.B1440 Right curtain air bag module (squib) system (short circuit between squib circuit 
terminals)

CAUTION

If the diagnosis code B1440 is set to SRS-ECU, 
be sure to diagnose the CAN bus line.

OPERATION

In case of side collision, when the impact exceeding 
the threshold is applied to the vehicle, and when the 
impact is simultaneously detected (turned ON) by the 
side impact sensor as well as by the analogue 
G-sensor in SRS-ECU, the ignition signal is sent 
from SRS-ECU to the curtain air bag module (squib) 
of impacted side.

TROUBLE JUDGEMENT

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

PROBABLE CAUSES

• Damaged short spring 

*

• Short circuit between terminals of curtain air bag 

module (squib) circuit

• Damaged connector(s)

• Malfunction of SRS-ECU

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.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-62

Q: Is the diagnosis code No. B1440 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, right 
curtain 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 
connector, connect it again.

AC904706AC

Harness side connector
 (2-pin, black)

Locking button

Flat-tipped 
screwdriver

Inflator

(3) After disconnecting the right curtain air bag 

module harness side connector, connect the 
connector again. For the right curtain air bag 
module connector disconnection, use the 
flat-tipped screwdriver to pull out the harness 
side connector locking button. After releasing the 
lock, disconnect the 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. B1440 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.

AC904706AC

Harness side connector
 (2-pin, black)

Locking button

Flat-tipped 
screwdriver

Inflator

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

locking button of harness side connector. After 
releasing the lock, disconnect the right curtain air 
bag module harness side connector.

AC301553 DQ

Curtain air bag 
module connector 

MB991865
(Dummy resistor: 3    )

MB991884 

(Resistor harness)

(3) Connect the dummy resistor (Special tool: 

MB991865) to the resistor harness (Special tool: 
MB991884).

(4) Connect the resistor harness (special tool) to 

right curtain air bag module connector.

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

the diagnosis code again.

Q: Is the diagnosis code No. B1440 set?

YES : 

Go to Step 5.

NO : 

Replace the right curtain air bag module 
(Refer to 

P.52B-144

.)

STEP 5. Resistance measurement at the 
SRS-ECU connector.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 

 

 

 

 

 

 

 

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