Mitsubishi Montero (2002-2004). Manual - part 794

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-45

STEP 5. Check the passenger's seat belt pretensioner 
circuit at the SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.

(2) Disconnect passenger's seat belt pretensioner connector F-

29.

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 27 and 28.
It should be open circuit.

Q: Does continuity exist?

NO :  Eras the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 28 sets, replace 
the SRS-ECU. (Refer to 

P.52Ba-31

.)

YES : Go to Step 6.

STEP 6. Check the harness for short circuit between SRS-
ECU connector E-07 (terminal No.27 and 28) and 
passenger’s seat belt pre-tensioner connector F-29 
(terminal No.1 and 2).
NOTE: After inspecting intermediate connector E-16, inspect 
the wiring harness. If the intermediate connector E-16 is dam-
aged, repair or replace it. (Refer to GROUP 00E, Harness Con-
nector Inspection 

P.00E-2

.) Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204127

AB

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

AC100326

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

E-07 HARNESS
CONNECTOR:
HARNESS SIDE

AH

AC204603AE

CONNECTOR: E-16

FLOOR 
CONSOLE

E-16

5

4

3

2

1

E-16

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-46

Q: Are harness wires between SRS-ECU connector E-07 

(terminal No.27 and 28) connector and passenger’s seat 
belt pre-tensioner connector F-29 (terminal No.1 and 2) 
in good condition?
YES : Go to Step 7.
NO :  Repair the harness wires between SRS-ECU 

connector E-07 and passenger’s seat belt pre-
tensioner connector F-29. Then go to Step 7.

STEP 7. Recheck for diagnostic trouble code. 
Q: Is DTC 28 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)

AC204127

AC

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

1 2

HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-47

DTC 29: Passenger’s (Front) Seat Belt Pre-Tensioner (Squib) System Fault 2 (Open in the Squib 
Circuit)

.

AC102676

Passenger's (Front) Seat Belt Pre-tensioner (Squib)

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AD

CONNECTOR: E-16

FLOOR 
CONSOLE

E-16

AC204127

AB

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-48

CIRCUIT OPERATION
The side impact sensor includes an analog G sensor 
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the side-air-
bags should be deployed, it sends a fire signal to the 
SRS-ECU to deploy the side-airbags. Besides that, 
the CPU diagnoses the internal components of the 
side impact sensor. If a malfunction occurs, it 
requests the SRS-ECU to set a diagnostic trouble 
code.

.

DTC SET CONDITIONS
These DTC are set if there is abnormal resistance 
between the input terminals of the passenger's seat 
belt pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• Open circuit in the passenger's seat belt preten-

sioner (squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-ll)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the passenger's seat belt pre-tensioner.
(1) Disconnect the negative battery terminal.
(2) Disconnect the passenger's seat belt pretensioner 

connector F-29.

(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 diagnostic trouble code memory, and then check the 

diagnostic trouble code.

Q: Is DTC 29 set?

YES : Go to Step 2.
NO :  Replace the passenger's seat belt pre-tensioner. 

(Refer to 

P.52Ba-44

.) Then go to Step 3. 

AC204127

AB

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

AC006042 AZ

MB991866
(RESISTOR HARNESS)

F-29 HARNESS 
CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω

)

F-29 SEAT BELT 
PRE-TENSIONER
CONNECTOR (PASSNGER'S SIDE)