Mitsubishi Outlander GS45X. Manual - part 1445

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-275

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC 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 

P.00-15

).

STEP 3. Check the passenger's seat belt pre-tensioner. 
(Using scan tool MB991958, read the diagnostic trouble 
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's seat belt pre-tensioner connector 

D-130. Use a flat-tipped screwdriver to unlock the locking 
button at the harness side connector by withdrawing it 
toward you in two stages, and then disconnect the 
connector.

(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-130 harness side 

connector.

(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the 

diagnostic trouble code.

Q: Is DTC B1C49 set?

YES : Go to Step 4.
NO :  Replace the passenger's seat belt with pre-tensioner 

(Refer to 

P.52B-457

). Then go to Step 5.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

AC506363AB

Seat belt 
pre-tensioner

Floor wiring harness side
connector (2-pin, black)

Locking 
button

Flat-tipped
screwdriver

AC301553 BE

Harness side 
connector

MB991865

(Dummy resistor: 3    )

MB991884 

(Resistor harness)

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-276

STEP 4. Check the harness for open circuit between 
SRS-ECU connector C-27 (terminal No.43 and 44) and the 
passenger's seat belt pre-tensioner connector D-130 
(terminal No.2 and 1).
(1) Disconnect the negative battery terminal.
(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 
C-27 SRS-ECU connector.

DANGER

To prevent the seat belt pre-tensioner from deploying 
unintentionally, disconnect the passenger’s seat belt 
pre-tensioner connector D-130 to short the squib cir-
cuit.

(3) Disconnect SRS-ECU connector C-27 and passenger's 

seat belt pre-tensioner connector D-130. For connector 
D-130, use a flat-tipped screwdriver to unlock the locking 
button at the harness side connector by withdrawing it 
toward you in two stages, and then disconnect the 
connector.

CAUTION

Insert an insulator such as a cable tie to a depth of 4mm 
(0.16 inch) or more, otherwise the short spring will not be 
released.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) 

thick] between terminals 43, 44 and the short spring to 
release the short spring.

AC507645

A

AC

Lock lever

AC506363AB

Seat belt 
pre-tensioner

Floor wiring harness side
connector (2-pin, black)

Locking 
button

Flat-tipped
screwdriver

AC507303AL

A

A

C-27 Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-277

(5) Connect D-130 harness side connector to special tool 

MB991884.

(6) Check for continuity between the following terminals. It 

should be less than 2 ohms. 

• SRS-ECU connector C-27 (terminal No.43) and the spe-

cial tool (terminal No.1)

• SRS-ECU connector C-27 (terminal No.44) and the spe-

cial tool (terminal No.2)

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1C49 sets, 
replace the SRS-ECU (Refer to 

P.52B-436

). Then go 

to Step 5.

NO :  Repair the harness wires between SRS-ECU 

connector C-27 passenger’s seat belt pre-tensioner 
connector D-130. Then go to Step 5.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1C49 set?

YES : Return to Step 1. 
NO :  The procedure is complete. 

AC201287 DG

MB991884 

(Resistor harness)

D-130 
Harness side 
connector

AC608812DJ

2

1

C-27 Harness side 
connector (front view)

Resistor harness 
side connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-278

DTC B1C4A: Front Passenger's Seat Belt Pre-tensioner (Squib) System (Short Circuit Between Squib 
Circuit Terminals)

CAUTION

If DTC B1C4A is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

CIRCUIT OPERATION

The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analog G-sensor. If the impact is 
over a predetermined level, the SRS-ECU sends an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the pre-tensioner will deploy. 

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the passenger’s seat 
belt pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• Improper engaged connector or defective short 

spring*

• Short circuit between the passenger's seat belt 

pre-tensioner (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

: CONNECTOR
  CONNECTED: ON
  CONNECTOR
  DISCONNECTED: OFF

NOTE

Seat Belt Pre-Tensioner (passenger's side) (Squib) Circuit

SRS-ECU

SEAT BELT 
PRE-TENSIONER 
(RH)

CONNECTOR 
LOCK 
SWITCH

CONNECTOR 
LOCK SWITCH

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

D-130 (B)

Connector: D-130

AI