Mitsubishi Montero (2002-2004). Manual - part 793

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-41

STEP 2. Check the harness for open circuit between SRS-
ECU connector E-07 (terminal No.29 and 30) and the 
driver's seat belt pretensioner F-27 (terminal No.1 and 2).

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(1) Disconnect SRS-ECU connector E-07 and driver's seat belt 

pretensioner connector F-27, and measure at the wiring 
harness.

(2) Check for continuity between the following terminals.

Between connector E-07 terminal 30 and connector F-27 
terminal 1
Between connector E-07 terminal 29 and connector F-27 
terminal 2
It should be less than 2 ohms.

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code sets. If DTC 27 sets, 
replace the SRS-ECU. (Refer to 

P.52Ba-31

.) Then go 

to Step 3.

NO :  Repair harness wires between SRS-ECU connector 

E-07 and driver’s seat belt pre-tensioner connector F-
27. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code. 
Q: Is DTC 27 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

.) 

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

AC006245

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

1 2

E-07 HARNESS 
CONNECTOR:
HARNESS SIDE

F-27 HARNESS CONNECTOR:
HARNESS SIDE

AF

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-42

DTC 28: Passenger’s (Front) Seat Belt Pre-Tensioner (Squib) System Fault 1 (Short Circuit between 
Terminals of 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-43

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
This DTC is set if there is abnormal resistance 
between the input terminals of the passenger’s seat 
belt pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• Short circuit between the passenger's seat belt 

pretensioner (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-ll)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the diagnostic trouble code.
Q: Is DTC 34 set?

YES : Go to Step 2.
NO :  Go to Step 3.

STEP 2. Check the SRS-ECU connector E-07.
Q: Is connector correctly engaged?

YES : Go to Step 3.
NO :  Engage the connector to the place. Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-44

STEP 3. Check SRS-ECU connector E-07 and passenger’s 
seat belt pre-tensioner connector F-29.
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-29, and then 

reconnect them.

(3) Connect the negative battery terminal.
(4) Erase the diagnostic trouble code memory, and the 

diagnostic trouble code.

Q: Is DTC 28 set?

YES : Go to Step 4.
NO :  The procedure is complete. It is assumed that DTC 28 

set as connector E-07 or F-29 was engaged 
improperly.

STEP 4. 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 check the 

diagnostic trouble code.

Q: Is DTC 28 set?

YES : Go to Step 5.
NO :  Replace the passenger's seat belt pre-tensioner. 

(Refer to 

P.52Ba-44

.) Then go to Step 7. 

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204127

AB

CONNECTOR: F-29

F-29 (R)

CENTER 
PILLAR

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)