Mitsubishi Montero (2002-2004). Manual - part 812

 

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Mitsubishi Montero (2002-2004). Manual - part 812

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-117

DTC 72: Right Hand Side-Airbag Module (Squib) System Fault 2 (Open in the Squib Circuit)

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the left and right side 
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition 
signal. At this time, if the side-airbag safing G-
sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag 

module to inflate the side-airbag.

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance 
between the input terminals of the side-airbag mod-
ule (RH) (squib).

.

TROUBLESHOOTING HINTS

• Open circuit in the side-airbag module (RH) 

(squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU

.

AC204436

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

Side-Airbag Module (RH) (Squib) Circuit

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

ACX01649

X0942CA

AD

CONNECTOR: F-21

F-21 (R)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-118

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-II)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the side-airbag module (RH).
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (RH) connector F-21.

(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 harness 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 72 set?

YES : Go to Step 2.
NO :  Replace the seat back assembly of the front seat 

(RH). (Refer to GROUP 52A, Front Seat 

P.52A-13

.) 

Then go to Step 3.

ACX01649

X0942CA

AD

CONNECTOR: F-21

F-21 (R)

AC006042 AW

MB991866
(RESISTOR HARNESS)

F-21 HARNESS 
CONNECTOR

F-21 SIDE-AIRBAG 
MODULE (RH) CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω

)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-119

STEP 2. Check the harness for open circuit between SRS-
ECU connector E-08 (terminal No.23 and 24) and the side-
air bag module (RH) connector F-21 (terminal No.1 and 2).
(1) Disconnect SRS-ECU connector E-07 and side-air bag 

module (RH) connector F-21.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(2) Check for continuity between the following terminals.

Between connector E-07 terminal 23 and connector F-21 
terminal 2
Between connector E-07 terminal 24 and connector F-21 
terminal 1
It should be less than 2 ohms.

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 72 sets, replace 
the SRS-ECU. (Refer to 

P.52Ba-31

.) Then go to Step 

3.

NO :  Repair the harness wires between SRS-ECU 

connector E-07 and side-airbag module (RH) 
connector F-21. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code. 
Q: Is DTC 72 set?

YES : Return to Step 1. 
NO :  The procedure is complete. (If no malfunctions are not 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.)

ACX01478AJ

CONNECTOR: E-07

E-07 (Y)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

HARNESS SIDE
CONNECTOR
(REAR VIEW)

ACX01649

X0942CA

AE

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS 
CONNECTOR:
HARNESS SIDE

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

1 2

AC100382

E-07 HARNESS
CONNECTOR:
HARNESS SIDE

F-21 HARNESS CONNECTOR:
HARNESS SIDE

AI

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-120

DTC 75: Right Hand Side-Airbag Module (Squib) System Fault Power Supply Circuit (Short-Circuit to 
Power Supply)

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the left and right side 
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition 
signal. At this time, if the side-airbag safing G-
sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag 

module to inflate the air bag.

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance 
between the input terminals of the side-airbag mod-
ule (RH) (squib).

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to the power supply in the side-airbag mod-

ule (RH) (squib) harness

• Malfunction of the SRS-ECU

.

AC204436

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

Side-Airbag Module (RH) (Squib) Circuit

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

ACX01649

X0942CA

AD

CONNECTOR: F-21

F-21 (R)

 

 

 

 

 

 

 

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