Mitsubishi Montero (2004+). Manual - part 1173

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-27

.

CIRCUIT OPERATION

• When the left and right front impact sensors 

detect a collision, the switches inside the sensors 
turn ON. 

• 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 sends an ignition signal. At this time, if 
the front air bag safing G-sensor is on, the SRS 
air bag will inflate. 

.

DTC SET CONDITIONS
These DTCs are set if there is abnormal resistance 
between the input terminals of the front impact sen-
sors.
The most likely causes for these codes to be set are 
shown in the table below:

.

TROUBLESHOOTING HINTS

• Damaged harness wires and connectors

• Front impact sensor failed

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991222: Probe

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B (Vehicles without 

CAN communication system)

AC204230

CONNECTOR : D-28

AB

D-28

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

DTC

SYMPTOM

1A

• Left front impact sensor or its wiring shorted

1B

• Left front impact sensor or wiring open circuit

1C

• Short to the power supply in the left front impact sensor harness

1D

• Short to body ground in the left front impact sensor harness

2A

• Right front impact sensor or its wiring shorted

2B

• Right front impact sensor or wiring open circuit

2C

• Short to the power supply in the right front impact sensor harness

2D

• Short to body ground in the right front impact sensor harness

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-28

Step 1. Check the front impact sensor.
Refer to 

P.52B-213

.

Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Replace the front impact sensor (Refer to 

P.52B-211

).

Step 2. Measure the resistance and voltage at SRS-ECU 
connector E-08.
(1) Disconnect SRS-ECU connector E-08.

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-29

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(2) Take the measurements below at harness-side connector 

E-08.

• Resistance between terminals 1 and 2, and between 3 

and 4.

NG: 2 ohms or less (short circuit) or 2 megohms or 
more (open circuit) 

• Continuity between terminals 1, 2, 3, 4 and body ground

OK: No continuity

• Voltage between terminals 1, 2, 3, 4 and body ground

OK: 0V

Q: Is the check result satisfactory?

YES : Go to Step 4.
NO :  Go to Step 3.

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC204768AC

E-08 HARNESS SIDE 
CONNECTOR
(REAR VIEW)

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC204767AC

E-08 HARNESS SIDE 
CONNECTOR 
(REAR VIEW)

AC103372

4

1

2

3

5

7

6

8

16

15

14

13

12

11

10

9

20

19

18

17

AE

4

1

2

3

5

7

6

8

16

15

14

13

12

11

10

9

20

19

18

17

AC210613

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-30

Step 3. Check the wiring harness between the right front 
impact sensor connector A-30 (terminal No.1 and 2) and 
SRS-ECU connector E-08 (terminal No.1 and 2) as well as 
between left front impact sensor connector A-23 (terminal 
No.1 and 2) and SRS-ECU connector E-08 (terminal No.3 
and 4).

AC204228

CONNECTOR: A-30

AD

A-30 (Y)

HARNESS SIDE 
CONNECTOR
(FRONT VIEW)

2

1

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204229

CONNECTOR: A-23

AD

A-23 (Y)

HARNESS SIDE 
CONNECTOR
(FRONT VIEW)

2

1