Mitsubishi Montero (2004+). Manual - part 1207

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-163

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to ground in the side-airbag module (RH) 

(squib) harness

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

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

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B (Vehicles without 

CAN communication system)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the side-airbag module (RH). (Using scan 
tool MB991958, read the diagnostic trouble code).
(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 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 76 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-14

). 

Then go to Step 4.

ACX01649

X0942CA

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

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)

52B-164

STEP 2. Check the harness for short circuit to ground 
between SRS-ECU and the side-airbag module (RH).
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect side-airbag 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.
(3) Check for continuity between E-07 harness connector 

terminals 23, 24 and body ground.
It should be open circuit.

Q: Does continuity exist?

YES : Go to Step 3.
NO :  Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 76 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

). Then go to Step 

4.

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

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC100384

E-07 HARNESS SIDE
CONNECTOR (REAR VIEW)

AO

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-165

STEP 3. Check the harness wires for short circuit to 
ground between SRS-ECU connector E-07 (terminal No.23 
and 24) and side-airbag module (RH) connector F-21 
(terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector 

E-07 (terminal No.23 and 24) and side-airbag module 
(RH) connector F-21 (terminal No.1 and 2) in good 
condition?
YES : Go to Step 4.
NO :  Repair the harness wires between SRS-ECU 

connector E-07 and side-airbag module (RH) 
connector F-21. Then go to Step 4.

STEP 4. Recheck for diagnostic trouble code. 
Q: Is DTC 76 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

AF

CONNECTOR: F-21

F-21 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-166

DTC 79: Left Hand Side-Airbag Module (Squib) System Fault 5 for Power Pupply Circuit
DTC 93: Left Hand Side-Airbag Module (Squib) System Fault 6 for Communication System

.

AC204437AB

Side Impact Sensor (LH) Power Supply Circuit

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AB

CONNECTOR: E-19

FLOOR 
CONSOLE

E-19

AC204128

AB

CONNECTOR: F-13

FRONT SEAT

SIDE IMPACT 
SENSOR

F-13 (Y)