Mitsubishi Montero (2002-2004). Manual - part 790

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-29

STEP 5. Check the harness for short circuit between SRS-
ECU and the passenger's air bag module.
(1) Disconnect SRS-ECU connector E-08.

(2) Unclip passenger’s air bag module connector D-11.

DANGER

To prevents the air bag from deploying unintention-
ally, disconnect the passenger’s air bag module con-
nector D-11 to short the squib circuit.

(3) Disconnect the passenger's air bag module connector D-11.

CAUTION

Insert an insulator such as a cable tie to a depth of 4mm 
(0.16 inch) or more, otherwise the short bar will not cable 
tie release.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) 

thick] between terminals 9, 10 and the short bar to release 
the short bar.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(5) Check for continuity between E-08 harness connector 

terminals 9 and 10.
It should be open circuit.

Q: Does continuity exist? 

YES : Eras the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 24 sets, replace 
the SRS-ECU. (Refer to 

P.52Ba-31

.) Then go to Step 

7.

NO :  Go to Step 6. 

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

AC006036

SECTION
A - A

A

A

CONNECTOR

SHORT BAR

AL

E-08 HARNESS CONNECTOR:
COMPORNENT SIDE

CABLE TIE

4 mm (0.16 inch) OR MORE

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC006044 AH

E-08 HARNESS 
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-30

STEP 6. Check the harness for short circuit between SRS-
ECU connector E-08 (terminal No.9 and 10) and 
passenger’s side air bag module connector D-11 (terminal 
No.1 and 2).
Q: Are harness wires between SRS-ECU connector E-08 

(terminal No.9 and 10) and passenger’s side air bag 
module connector D-11 (terminal No.1 and 2) in good 
condition?
YES : Go to Step 7.
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 7.

STEP 7. Recheck for diagnostic trouble code. 
Q: Is DTC 24 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

.) 

ACX01478AH

CONNECTOR: E-08

E-08 (Y)

HARNESS
CONNECTOR:
HARNESS SIDE

AC204125

CONNECTOR: D-11

AD

D-11 (R)

GLOVE BOX
STRIKER

1 2

HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-31

DTC 25: Passenger’s (Front) Air Bag Module (Squib) System Fault 2 (Open in the Squib Circuit)

.

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 SRS air 
bag will inflate. 

• The ignition signal is input to the air bag module 

via the clock spring to inflate the air bag.

.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance 
between the input terminals of the passenger’s air 
bag module (squib). The most likely causes for this 
code to be set are shown in the table below: How-
ever, if no DTC resets, the SRS warning light will be 
switched off (DTC will be retained). 

.

TROUBLESHOOTING HINTS

• Open circuit in the passenger's air bag module 

(squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU

.

AC204435AB

Passenger's (Front) Air Bag Module (Squib) Circuit

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-32

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-II)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the passenger's air bag module.
(1) Disconnect the negative battery terminal.
(2) Unclip passenger’s air bag module connector D-11.

(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) Disconnect the passenger's air bag module connector C-

106, and insert special tool MB991866 into the harness 
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 25 ?

YES : Go to Step 2.
NO :  Replace the passenger's air bag module. (Refer to 

P.52Ba-33

.) Then go to Step 3.

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

AC006042 AV

MB991865 (DUMMY 
RESISTOR: 3 

Ω

)

MB991866
(RESISTOR HARNESS)

D-11 HARNESS 
CONNECTOR

D-11 PASSENGER'S AIR BAG 
MODULE CONNECTOR