Mitsubishi Montero Sport (2004+). Manual - part 492

SEAT BELT DIAGNOSIS

TSB Revision

INTERIOR

52A-13

STEP 1. Check the input signal (by using pulse check).
<When using scan tool MB991958>

CAUTION

1. To prevent damage to scan tool MB991958, always turn the 

ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.

Connect the scan tool MB991958 to the data link connector.

2. If tone alarm of scan tool MB991958 sounds once when the 

seat belt buckle switch is operated (ON/OFF), the 
ETACS-ECU input signal for that switch circuit system is 
normal.

<When using a voltmeter>

1. Use special tool MB991529 to connect a voltmeter between 

the ground terminal 4 or 5 and the ETACS terminal 9 of the 
data link connector.

2. If the voltmeter indicator deflects once when the seat belt 

buckle switch is operated (ON/OFF), the ETACS-ECU input 
signal for that switch circuit system is normal.

Q: Is the switch circuit system normal?

YES : Replace the ETACS-ECU 

P.52A-52

. Then go to Step 

5  .

NO :  Go to Step 2.

STEP 2. Check the seat belt buckle switch continuity.

Q: No continuity should exist when the seat belt is 

fastened, while continuity should exist when the seat 
belt is unfastened?
YES : Go to Step 3.
NO :  Replace the seat belt buckle 

P.52A-52

. Then go to 

Step 5       .

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC003237

MB991529

GROUND
TERMINAL

ETACS
TERMINAL

AC

AC003238

TONGUE

BUCKLE

E-35

AE

SEAT BELT DIAGNOSIS

TSB Revision

INTERIOR

52A-14

STEP 3. Check the harness wires between ETACS-ECU 
connector D-11 (terminal No. 7) and seat belt buckle switch 
connector E-35.

1

2

4

5

3

6

8

9

7

10

11

13

14

12

16

17

201918

15

AC201086AD

D-11 COMPONENT SIDE

D-13 COMPONENT SIDE

CONNECTORS: D-11, D-13

D-13

D-11

AC203290

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

2 1

CONNECTORS: E-35, E-42

E-35

E-42

E-35 COMPONENT SIDE

E-42

AB

SEAT BELT DIAGNOSIS

TSB Revision

INTERIOR

52A-15

NOTE: Check the intermediate connector D-13 and E-42, and 
then the wiring harness. If the intermediate connectors D-13 
and E-42 are damaged, repair or replace them. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go 

to Step 5.
Q: Is the harness wires between ETACS-ECU connector 

D-11 (terminal No. 7) and seat belt buckle switch 
connector in good condition?
YES : Go to Step 4.
NO :  Repair them. Then go to Step5.

STEP 4. Check the harness wire between seat belt buckle 
switch connector E-35 (terminal No.2) and ground.

Q: Is the harness wire between seat belt buckle switch 

connector E-35 (terminal No.2) and ground in good 
condition?
YES : Go to Step 5.
NO :  Repair them. Then go to Step 5.

STEP 5. Retest the system.
Q: The seat belt warning light illuminate or flash, but does 

the seat belt tone alarm sound?
YES : This procedure is complete. (If no malfunctions are 

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.00-7

.) 

NO :  There is no action to be taken.

AC201073

2 1

CONNECTOR: E-35

COMPONENT 
SIDE

AB

E-35

SEAT BELT DIAGNOSIS

TSB Revision

INTERIOR

52A-16

INSPECTION PROCEDURE 3: When the Seat Belt is not Fastened and the Ignition Switchis Turned to 
the "ON" Position, the Seat Belt Tone Alarm Sounds, but the Seat Belt Warning Light does not 
Illuminate or Flash.

Seat Belt Warning Light Circuit

AC003241

CONNECTORS: C-02, C-04

C-02

C-04

AB

AC003228AB

CONNECTORS: D-08, D-11, D-13

D-13

D-11

D-08

JUNCTION
BLOCK (REAR)