Mitsubishi Outlander GS45X. Manual - part 1397

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-83

DTC B1B09: Passenger's (Front) Air Bag Module (<1st squib>) System (Shorted to Squib Circuit 
Power Supply)

 

DTC B1B0D: Passenger's (Front) Air Bag Module (<2nd squib>) System (Shorted to Squib Circuit 
Power Supply

CAUTION

• If DTC B1B09 <1st squib> or B1B0D <2nd 

squib> is set in the SRS-ECU, always diag-
nose the CAN main bus line.

• When DTC B1B09 is set in the following diag-

nosis, check the 1st squib circuit. When DTC 
B1B0D is set, check the 2nd squib circuit.

.

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 SRS 
air bag will inflate. 

• The ignition signal is input to the air bag module 

to inflate the air bag.

.

AC709835

PASSENGER'S (FRONT) 
AIR BAG MODULE
(SQUIB)

CONNECTOR LOCK SWITCH 

CONNECTOR COUPLED: ON 

CONNECTOR UNCOUPLED: OFF

NOTE

:   

 

 

Passenger's (Front) Air Bag Module (Squib) Circuit

SRS-ECU

AB

AC901076AE

Connectors: C-11, C-28

C-11 (Y)

C-28 (Y)

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-84

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the passenger's 
(front) air bag module (squib).

.

TROUBLESHOOTING HINTS

• Damaged harness wires and connectors

• Short to the power supply in the passenger's 

(front) air bag module (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

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-85

STEP 2. 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 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

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-86

STEP 3. Check the passenger's (front) air bag module. 
(Using scan tool MB991958, read the diagnostic trouble 
code.)
(1) Disconnect the negative battery terminal.
(2) Slide the outer housing of passenger’s (front) air bag 

module connector C-11 in the arrow direction shown, and 
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 special tool MB991866 into the harness side 

connector C-11 (terminal No.1 and 2 <1st squib> or terminal 
No.3 and 4 <2nd squib>) by backprobing.

(5) Connect the negative battery terminal.

CAUTION

Always DTC B1B0E is set when checking DTC B1B09. This 
is because the second side terminal is isolated when 
checking it. DTC B1B0E is set but this is not a fault. In 
addition, always DTC B1B0A is set when checking DTC 
B1B0D because the first side terminal is isolated. 
(6) Erase the diagnostic trouble code memory, and check the 

diagnostic trouble code.

Q: Is the checked DTC set?

YES : Go to Step 4.
NO :  Replace the passenger's (front) air bag module. 

(Refer to 

P.52B-439

). Then go to Step 6. 

AC701511

Outer housing of the passenger's (front) air bag
module connector

 

AC

AC701551AB

MB991865
(Dummy resistor: 3 

Ω) 

MB991866
(Resistor harness) 

C-11 Harness
side connector

 

C-11 Passenger's (front)
air bag module connector