Mitsubishi Outlander GS45X. Manual - part 1414

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-151

• The ignition signal is input to the curtain air bag 

module (RH) to inflate the curtain air bag.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the curtain air bag 
module (RH) (squib).

.

TROUBLESHOOTING HITS

• Improper engaged connector or defective short 

spring*

• Short circuit between the curtain air bag module 

(RH) (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a 
"short" spring (which prevents the air bag from 
deploying unintentionally due to static electricity by 
shorting the positive wire to the ground wire in the 
squib circuit when the connectors are disconnected) 
(Refer to 

P.52B-28

). Therefore, if connector C-27, 

D-08 or D-104 is damaged or improperly engaged, 
the short spring may not be released when the con-
nector is connected.

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

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 the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

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

Diagnosis 

P.54C-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-152

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 Use Troubleshooting/Inspection 
Service Points 

− How to Cope with Intermittent 

Malfunctions 

P.00-15

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-153

STEP 3. Check SRS-ECU connector C-27, curtain air bag 
module (RH) connector D-104 and intermediate connector 
D-08. (Using scan tool MB991958, read the diagnostic 
trouble code.)
(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. Then connect the connector.

(3) Disconnect the D-104 connector, and then reconnect it. Use 

a flat-tipped (

−) screwdriver to pull out the D-104 curtain air 

bag module harness side connector locking button toward 
the arrow direction, release the lock, and then disconnect 
the connector.

(4) Disconnect the D-08 connector’s, and then reconnect them. 

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

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

diagnostic trouble code again.

(7) Disconnect the negative battery terminal.
Q: Is DTC B1B23 set?

YES : Go to Step 4.
NO :  Intermittent Malfunction (Refer to GROUP 00, How to 

Use Troubleshooting/Inspection Service Points 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

AC506734

A

AB

Lock lever

AC701573

Locking 
button

 

Flat-tipped screwdriver

Inflator

Curtain air bag wiring
harness side connector

 

AB

AC706606

AH

Locking button

Intermediate 

connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-154

STEP 4. Check by dummy resistor connection. (Using scan 
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-08 intermediate 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 probe into the terminal from its front side 
directly, as the connector contact pressure may be weak-
ened.
(4) Insert the probe of resistor harness, to which the dummy 

resistor is installed, from the back of D-08 intermediate 
connector (floor harness side).

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

diagnostic trouble code again.

Q: Is DTC B1B23 set?

YES : Go to Step 5.
NO :  Go to Step 6.

AC706606

AH

Locking button

Intermediate 

connector

AC507310AB

D-08 Intermediate connector
(Curtain air bag harness side)

D-08 
Intermediate 
connector 
(Floor harness side)

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)