Mitsubishi Outlander GS45X. Manual - part 1403

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-107

STEP 5. Resistance measurement at the D-13 intermediate 
connector.
(1) Disconnect the negative battery terminal.

DANGER

To prevent the air bag from deploying unintentionally, 
disconnect the curtain air bag module connector 
D-109 to short the squib circuit.

(2) Disconnect curtain air bag module (LH) D-109. 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) Disconnect the D-13 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.

(4) Because the short spring is installed to the D-13 

intermediate connector (curtain air bag harness side), insert 
a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] 
between terminals 1, 2 and the short spring to release the 
short spring.

CAUTION

Do not insert a probe into the terminal from its front side 
directly as the connector contact pressure may be weak-
ened.
(5) Check for continuity between the D-13 intermediate 

connector (module side) terminal No. 1, 2 and the body 
ground.
It should be open circuit.

Q: Is it open circuit?

YES : Replace the curtain air bag module (squib) (Refer to 

P.52B-453

).

NO :  Repair the wiring harness.

AC701573

Locking 
button

 

Flat-tipped screwdriver

Inflator

Curtain air bag wiring
harness side connector

 

AB

AC706606

AH

Locking button

Intermediate 

connector

AC700119

D-13 Intermediate 
connector (module side ) 

22 mm or more

Cable tie

Short spring

AK

AC709326

D-13 Intermediate connector 
(Curtain air bag harness side)
(rear view)

AC

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-108

STEP 6. 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 B1B18 set?

YES : Replace SRS-ECU. (Refer to 

P.52B-436

.)

NO :  Intermittent Malfunction (Refer to GROUP 00, How to 

Use Troubleshooting/Inspection Service Points 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-109

DTC B1B19: Curtain Air bag Module (LH) (Squib) System (Shorted to Squib Circuit Power Supply)

CAUTION

If DTC B1B19 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 side impact sensors 
installed on the lower side of the center pillar and 
at the quarter panel inner. 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 curtain air bag 

module (LH) to inflate the curtain air bag.

CURTAIN AIR BAG
MODULE
(SQUIB) (LH)

SRS-ECU

AC709440

Curtain Air Bag Module (Squib) (LH) Circuit

NOTE

*: CONNECTOR LOCK SWITCH

CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

AB

AC901076

C-27 (Y)

AC

Connector: C-27

AC901080AB

Connectors: D-13, D-109

D-109 (B)

D-13 (Y)

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-110

.

DTC SET CONDITIONS

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

.

TROUBLESHOOTING HITS

• Damaged wiring harnesses or connectors

• Short to the power supply in the curtain air bag 

module (LH) (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

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