Mitsubishi Montero (2004+). Manual - part 1212

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-183

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to ground in the left hand side-airbag mod-

ule (squib) harness

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tool:

• 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

STEP1. Check the side-airbag module (LH). (Using scan 
tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the left hand side-airbag connector F-15.
(3) Connect special tool MB991865 to special tool MB991866.

(4) 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.
(5) Insert special tool MB991866 into the harness side 

connector by backprobing.

(6) Connect the negative battery terminal.
(7) Erase diagnostic trouble code memory, and check the 

diagnostic trouble code. 

Q:  Is DTC 86 set?

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

(Refer to GROUP 52A, Front Seat 

P.52A-14

). Then 

go to Step 4.

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

AC006042 AX

MB991866
(RESISTOR HARNESS)

F-15 HARNESS 
CONNECTOR

F-15 SIDE-AIRBAG 
MODULE (LH) CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-184

STEP 2. Check the side-airbag module (LH) circuit at the 
SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect left hand side-airbag module connector F-15.

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 21, 22 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 86 sets, replace 
the SRS-ECU (Refer to 

P.52B-217

). 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)

AC204635 AD

CONNECTOR: F-15

F-15 (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

AC100392AO

E-07 HARNESS SIDE
CONNECTOR 
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-185

STEP 3. Check the harness wires for short circuit to 
ground between SRS-ECU connector E-07 (terminal No.21 
and 22) and side-airbag module (LH) connector F-15 
(terminal No.1 and 2).
Q: Are the harness wires for short circuit to ground 

between SRS-ECU connector E-07 (terminal No.21 and 
22) and side-airbag module (LH) connector F-15 
(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 (LH) 
connector F-15. Then go to Step 4. 

STEP 4. Recheck for diagnostic trouble code. 
Q: Is DTC 86 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)

AC204635 AD

CONNECTOR: F-15

F-15 (R)

1 2

HARNESS SIDE 
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-186

DTC 89: Right Hand Side-Airbag Module (Squib) System Fault 5 for Power Supply Circuit
DTC 96: Right Hand Side-Airbag Module (Squib) System Fault 6 for Communication System

.

AC204440

Side Impact Sensor (RH) Power Supply Circuit

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AD

CONNECTOR: E-16

FLOOR 
CONSOLE

E-16

AC204129

AB

CONNECTOR: F-19

SIDE IMPACT 
SENSOR

F-19 (Y)

CENTER 
PILLER