Mitsubishi Montero (2002-2004). Manual - part 806

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-93

STEP 2. Check the passenger's air bag module circuit at 
the SRS-ECU connector E-08.
(1) Disconnect SRS-ECU connector E-08.

DANGER

Unclip passenger’s air bag module connector D-11.To 
prevents the air bag from deploying unintentionally, 
disconnect the passenger’s air bag module connec-
tor D-11 to short the squib circuit.

(2) Disconnect the 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 E-08 harness connector 

terminals 9, 10 and body ground.
There should be open circuit.

Q: Does continuity exist? 

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 65 sets, replace 
the SRS-ECU. (Refer to 

P.52Ba-31

.) Then go to Step 

4.

NO :  Go to Step 3. 

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC204125

CONNECTOR: D-11

AC

D-11 (R)

GLOVE BOX
STRIKER

AC006258

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

E-08 HARNESS CONNECTOR: HARNESS SIDE

AI

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-94

STEP 3. Check the harness wires for short circuit to 
ground between SRS-ECU connector E-08 (terminal No.9 
and 10) and passenger's air bag module connector D-11 
(terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector E-

08 (terminal No.9 and 10) and passenger's air bag 
module connector D-11 (terminal No.1 and 2) in good 
condition? 
YES : Go to Step 4.
NO :  Repair the harness wires between SRS-ECU 

connector E-08 and passenger's air bag module 
connector D-11. Then go to Step 4. 

STEP 4. Recheck for diagnostic trouble code. 
Q: Is DTC 65 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-95

DTC 66: Driver's Seat Belt Pre-Tensioner (Squib) System Fault for Power Supply Circuit (Short-Circuit 
to Power Supply)

.

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-96

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

• Damaged wiring harnesses or connectors

• Short to the power supply in the driver's seat belt 

pretensioner (squib) harness

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-ll)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. 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 side 

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 66 set?

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

P.52Ba-44

.) Then go to Step 4. 

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)