Mitsubishi Outlander (2013+). Manual - part 605

 

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Mitsubishi Outlander (2013+). Manual - part 605

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-71

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 left 

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. B1450 set?

YES : 

Go to Step 5.

NO : 

Replace the left 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 
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 SRS-ECU wiring harness side 
connector short spring in the following oper-
ations, disconnect curtain air bag module 
connector in advance, and keep the squib 
circuit shorted.

AC904706AC

Harness side connector
 (2-pin, black)

Locking button

Flat-tipped 
screwdriver

Inflator

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

locking button of harness side connector. After 
releasing the lock, disconnect the left curtain air 
bag module 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 CLS+, CLS- 
line and the short spring, and release the short 
spring.

(5) Check the continuity between the SRS-ECU 

wiring harness side connector CLS+, CLS- line. 

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness. 

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1450 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-72

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.B1451 Left curtain air bag module (squib) system (open circuit of squib circuit)

CAUTION

If the diagnosis code B1451is 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 electric current is sup-
plied from SRS-ECU to the curtain air bag module 
(squib) of impacted side.

TROUBLE JUDGEMENT

The code is set when the open circuit occurs to the 
SRS-ECU curtain air bag module (squib) circuit.

PROBABLE CAUSES

• Open circuit to the curtain air bag module (squib) 

circuit

• Damaged connector(s)

• 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. B1451set?

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.

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 D-17 curtain air bag module 
connector to the direction of the arrow. After 
releasing the lock, disconnect the 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 left 

curtain air bag module connector.

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

the diagnosis code again.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-73

(7) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1451 set?

YES : 

Go to Step 4.

NO : 

Replace the left curtain air bag module 
(Refer to 

P.52B-144

).

STEP 4. Resistance measurement at the 
SRS-ECU connector and the left curtain air bag 
module 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 SRS-ECU wiring harness side 
connector short spring in the following oper-
ations, disconnect curtain air bag module 
connector in advance, and keep the squib 
circuit shorted.

AC904706AC

Harness side connector
 (2-pin, black)

Locking button

Flat-tipped 
screwdriver

Inflator

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

locking button of left curtain air bag module 
connector to the direction of the arrow. After 
releasing the lock, disconnect the 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 CLS+, CLS- 
line and the short spring, and release the short 
spring.

AC201287

MB991884

Curtain air bag 
module connector

GI

(5) Connect the resistor harness (Special tool: 

MB991884) to the removed left curtain air bag 
module connector.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-74

NOTE: When the resistor harness is connected, 
the terminal No. of connected side and the CLS+, 
CLS- line of resistor harness connector will 
become inverted.

AC506985FG

2

1

SRS-ECU 
harness side 
connector (front view)

Resistor harness side 

connector (front view)

(6) Take the following measurements.

• Continuity CLS+ line between SRS-ECU wir-

ing harness side connector and the resistor 
harness connector

• Continuity CLS- line between SRS-ECU wir-

ing harness side connector and the resistor 
harness connector

OK: Continuity (less than 2 

Ω)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1451 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.B1452 Left curtain air bag module (squib) system (shorted to squib circuit earth)

CAUTION

If the diagnosis code B1452is 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 electric current is sup-
plied from SRS-ECU to the curtain air bag module 
(squib) of impacted side.

TROUBLE JUDGEMENT

The code is set when the input terminal of SRS-ECU 
curtain air bag module (squib) is shorted to earth.

PROBABLE CAUSES

• Damaged wiring harness and connector

• Curtain air bag module (squib) harness 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: Is the diagnosis code No. B1452set?

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 

 

 

 

 

 

 

 

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