Mitsubishi Montero (2002-2004). Manual - part 791

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-33

STEP 2. Check the harness for open circuit between SRS-
ECU connector E-08 (terminal No.9 and 10) and the 
passenger's side air bag module connector D-11 (terminal 
No.1 and 2).
(1) Unclip passenger’s air bag module connector D-11.
(2) Disconnect SRS-ECU connector E-08 and passenger's air 

bag module connector D-11.

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 the following terminals.

Between connector E-08 terminal 9 and connector D-11 
terminal 1
Between connector E-08 terminal 10 and connector D-11 
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. If DTC 25 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-08 and passenger’s side air bag module 
connector D-11. Then go to Step 3.

STEP 3. Recheck for diagnostic trouble code. 
Q: Is DTC 25 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

.) 

ACX01478 AD

CONNECTOR: E-08

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

1 2

1 2

3 4

5 6 7 8 9 10 11 12

13 14 15 16

18 19 20

17

AC100349

E-08 HARNESS 
CONNECTOR:
HARNESS SIDE

D-11 HARNESS CONNECTOR:
HARNESS SIDE

AH

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-34

DTC 26: Driver’s Seat Belt Pre-Tensioner (Squib) System Fault 1 (Short Circuit between Terminals of 
the Squib Circuit)

.

AC102677

Driver's Seat Belt Pre-Tensioner (Squib)

AB

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204603AB

CONNECTOR: E-19

FLOOR 
CONSOLE

E-19

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-35

CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analog G-sensor. If the impact is 
over a predetermined level, the SRS-ECU outputs an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the pre-tensioner will deploy. 

.

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

.

TROUBLESHOOTING HITS

• Short circuit between the driver's seat belt preten-

sioner (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 4.

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

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

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-36

STEP 3. Check SRS-ECU connector E-07 and driver’s seat 
belt pre-tensioner connector F-27.
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-07 and F-27, and then 

reconnect them.

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

diagnostic trouble code.

Q: Is DTC 26 set?

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

26 set as connector E-07 or F-27 was engaged 
improperly.)

STEP 4. Check the driver's seat belt pre-tensioner.
(1) Disconnect the negative battery terminal.
(2) Disconnect the driver's seat belt pretensioner connector F-

27.

(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 26 set?

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

P.52Ba-44

). Then go to Step 7.

ACX01478AI

CONNECTOR: E-07

E-07 (Y)

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

AC204126

AB

CONNECTOR: F-27

F-27 (R)

CENTER 
PILLAR

AC006042 AY

MB991866
(RESISTOR HARNESS)

F-27 HARNESS 
CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3 

Ω

)

F-27 SEAT BELT 
PRE-TENSIONER
CONNECTOR (DRIVER'S SIDE)