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)