Mitsubishi Montero (2004+). Manual - part 1177

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-43

STEP 3. Check SRS-ECU connector E-08, clock spring 
connector D-206 and driver’s airbag module connector 
D-229. (Using scan tool MB991958, read the diagnostic 
trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnection connectors E-08, D-206 and D-229, 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 21 set?

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

21 set as connector E-08, D-206 or D-229 was 
engaged improperly).

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204226 AF

CONNECTOR: D-206

CLOCK SPRING

D-206 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

1 2

4

3

AC100441AE

D-229 AIR BAG MODULE
CONNECTOR

STEERING WHEEL

A

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-44

STEP 4. Check the driver's air bag module. (Using scan 
tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) By sliding the A section (in the figure) of air bag module 

connector D-229 in the arrow direction, disconnect the 
connector.

(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 clock spring side air bag 

module connector D-229 by backprobing.

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

diagnostic trouble code. 

Q:  Is DTC 21 set?

YES : Go to Step 5.
NO :  Replace the driver's air bag module (Refer to 

P.52B-217

). Then go to Step 8. 

STEP 5. Check the clock spring. (Using scan tool 
MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the clock spring connector D-206.
(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 clock spring harness 

connector D-206 (terminal No.3 and 4) by backprobing.

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

diagnostic trouble code.

Q: Is DTC 21 set?

YES : Go to Step 6.
NO :  Replace the clock spring (Refer to 

P.52B-217

). Then 

go to Step 8. 

AC100441AE

D-229 AIR BAG MODULE
CONNECTOR

STEERING WHEEL

A

AC303006AD

D-229 AIR BAG
MODULE
CONNECTOR

MB991865
(DUMMY RESISTOR : 3

Ω)

MB991866 (RESISTOR 
HARNESS)

AC303587

D-206 CLOCK SPRING
CONNECTOR

AD

MB991865
(DUMMY RESISTOR : 3

Ω)

MB991866 (RESISTOR 
HARNESS)

1 2

4

3

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-45

STEP 6. Check harness between the SRS-ECU and the 
clock spring for short circuit.
(1) Disconnect SRS-ECU connector E-08.

DANGER

To prevents the air bag from deploying unintention-
ally, disconnect the clock spring connector D-206 to 
short the squib circuit.

(2) Disconnect the clock spring connector D-206.

CAUTION

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

thick] between terminals 11, 12 and the short spring to 
release the short spring.

CAUTION

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

terminals 11 and 12.
It should be open circuit.

Q: Does continuity exist? 

YES : Go to Step 7. 
NO :  Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 21 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

). Then go to Step 

8. 

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204226 AF

CONNECTOR: D-206

CLOCK SPRING

D-206 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

1 2

4

3

AC100391AT

SECTION
A - A

E-08 HARNESS SIDE 
CONNECTOR (FRONT VIEW)

CABLE TIE

SHORT SPRING

4 mm (0.16 inch) OR MORE

TERMINAL

A

A

E-08 
HARNESS SIDE
CONNECTOR 
(REAR VIEW)

AP

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-46

STEP 7. Check the harness for short circuit between 
SRS-ECU connector E-08 (terminal No.11 and 12) and 
clock spring connector D-206 (terminal No.3 and 4).
Q: Are harness wires between SRS-ECU connector E-08 

(terminal No.11 and 12) and clock spring connector 
D-206 (terminal No.3 and 4) in good condition?
YES : Go to Step 8.
NO :  Repair the harness wires between SRS-ECU 

connector E-08 and clock spring connector D-206. 
Then go to Step 8.

STEP 8. Recheck for diagnostic trouble code. 
Q: Is DTC 21 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

). 

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204226 AF

CONNECTOR: D-206

CLOCK SPRING

D-206 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

1 2

4

3