Mitsubishi Montero (2002-2004). Manual - part 788

 

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Mitsubishi Montero (2002-2004). Manual - part 788

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-21

DTC 22: Driver's Air Bag Module (Squib) System Fault 2 (Open in the Squib Circuit)

.

AC204430

Driver's Air Bag Module (Squib) Circuit 

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR

CONNECTED: ON
CONNECTOR

DISCONNECTED: OFF

AB

AC204226AD

CLOCK SPRING

D-206 (Y)

CONNECTORS: D-206, D-229

D-229

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-22

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 driver's side air 
bag module (squib). The most likely causes for 
this code to be set are the followings: 

• Open circuit in the driver's air bag module 

(squib) or harness

• Open circuit in the clock spring

• Malfunction of connector contact

However, if no DTC resets, the SRS warning light will 
be switched off (DTC will be retained). 

.

TROUBLESHOOTING HINTS

• Open circuit in the clock spring

• Open circuit due to improper neutral position of 

the clock spring

• Open circuit in the driver's air bag module (squib) 

circuit

• Disengaged driver's air bag module (squib) con-

nector

• Improper connector contact

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991502: Scan Tool (MUT-II)

• MB991865: Dummy resister

• MB991866: Resister harness

STEP 1. Check the driver's air bag module.
(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 22 set?

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

P.52Ba-33

.) Then go to Step 4. 

AC100441AE

D-229 AIR BAG MODULE
CONNECTOR

STEERING WHEEL

A

AC006030 AH

D-229 AIR BAG
MODULE
CONNECTOR

MB991865
(DUMMY RESISTOR : 3

Ω)

MB991866 (RESISTOR 
HARNESS)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-23

STEP 2. Check the clock spring.
(1) Disconnect the negative battery terminal.
(2) Disconnect 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 

diagnostic trouble code.

Q: Is DTC 22 set?

YES : Go to Step 3.
NO :  Replace the clock spring. (Refer to 

P.52Ba-33

.) Then 

go to Step 4. 

AC006031

D-206 CLOCK SPRING
CONNECTOR

AJ

MB991865
(DUMMY RESISTOR : 3

Ω)

MB991866 (RESISTOR 
HARNESS)

1 2

4

3

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-24

STEP 3. Check the harness between the SRS-ECU 
connector E-08 (terminal No.11 and 12) and the clock 
spring connector (terminal No.3 and 4) for open circuit.
(1) Disconnect SRS-ECU connector E-08 and clock spring 

connector D-206, and measure at the wiring harness side.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(2) Check for continuity between the following terminals.

Between connector E-08 terminal 11 and connector D-206 
terminal 3
Between connector E-08 terminal 12 and connector D-206 
terminal 4
It should be less than 2 ohms.

Q: Does continuity exist? 

YES : Eras the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 22 sets, replace 
the SRS-ECU. (Refer to 

P.52Ba-31

.) Then go to Step 

4. 

NO :  Repair the harness wires between SRS-ECU 

connector E-08 and clock spring connector D-206. 
Then go to Step 4.

STEP 4. Recheck for diagnostic trouble code.
Q: Is DTC 22 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 AG

CONNECTOR: E-08

E-08 (Y)

AC204226AB

CONNECTOR: D-206

CLOCK SPRING

D-206 (Y)

1 2

4

3

AC200924

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

D-206 HARNESS 
CONNECTOR: 
HARNESS SIDE

E-08 HARNESS
CONNECTOR: 
HARNESS SIDE

AC

 

 

 

 

 

 

 

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