Mitsubishi Outlander GS45X. Manual - part 1421

 

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Mitsubishi Outlander GS45X. Manual - part 1421

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-179

CAUTION

If DTC B1C27 is set in the SRS-ECU, always diag-
nose the CAN bus lines.

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the side impact sensor 
installed on the lower side of the center pillar. If 
the impact is over a predetermined level, the 
SRS-ECU sends an ignition signal. At this time, if 
the side collision safing G-sensor is on, the SRS 
air bag will inflate.

• The ignition signal is input to the side-air bag 

module to inflate the side-air bag.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the side-air bag mod-
ule (LH) (squib).

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to ground in the left hand side-air bag mod-

ule (squib) harness

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

•  MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

• MB991865: Dummy resistor

• MB991866: Resister harness

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

D-29 (Y)

Connector: D-29

AE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-180

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

scan tool 

P.52B-28

."

(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

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

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-181

STEP 3. Check the side-air bag module (LH). (Using scan 
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-29 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.

(3) Connect special tool MB991865 to special tool MB991866.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(4) Insert special tool MB991866 into the D-29 harness side 

connector by backprobing.

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

diagnostic trouble code.

Q:  Is DTC B1C27 set?

YES : Go to Step 4.
NO :  Replace the seatback assembly (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-19

). Then go to 

Step 6.

AC706606

AI

Locking button

Side-airbag 

module

connector

AC507310AF

D-29 

Side-airbag 

module (RH) connector

D-29 
Harness side 
connector

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-182

STEP 4. Check the side-air bag module (LH) circuit. 
Measure the resistance at the SRS-ECU connector C-27.
(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 air bag from deploying unintentionally, 
disconnect the side-airbag module (LH) connector 
D-29 to short the squib circuit.

(3) Disconnect the D-29 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.

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 31, 32 and the short spring to 
release the short spring.

(5) Check for continuity between C-27 harness side connector 

terminals 31, 32 and body ground.
It should be an open circuit.

Q: Is it open circuit? 

YES : Erase the diagnostic trouble code from memory, and 

check the diagnostic trouble code. If DTC B1C27 
sets, replace the SRS-ECU. (Refer to 

P.52B-436

). 

Then go to Step 6.

NO :  Go to Step 5. 

AC507645

A

AC

Lock lever

AC706606

AI

Locking button

Side-airbag 

module

connector

AC507303AK

A

A

C-27 Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

AC608812CR

C-27 Harness side 
connector (front view)

 

 

 

 

 

 

 

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