Mitsubishi Montero (2004+). Manual - part 1191

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-99

DTC 43: SRS Warning Light Drive Circuit System Fault 1 (Light does not Illuminate).

AC204592

SRS Warning Light Drive Circuit

AB

AC204230

CONNECTORS : D-03, D-04

AC

D-03 (GR)

D-04 (GR)

ACX01632

CONNECTORS: D-208, D-210

D-208

D-210

JUNCTION BLOCK
(FRONT VIEW)

AG

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-100

.

CIRCUIT OPERATION

• Power for the SRS warning light is supplied from 

the ignition switch (IG1) circuit.

• The SRS warning light illuminates when the igni-

tion switch is turned to the "ON" position and 
goes out after approximately seven seconds if 
there is not a malfunction in the SRS system.

.

DTC SET CONDITIONS
This DTC is set when an open circuit is detected for 
a continuous period of five seconds while the 
SRS-ECU is monitoring the SRS warning light and 
the light is OFF. (transistor OFF). However, if the 
vehicle condition returns to normal, DTC 43 will be 
automatically erased, and the SRS warning light will 
go out.

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Blown bulb

• Malfunction of the SRS-ECU

• Malfunction of the combination meter

.

DIAGNOSIS

Required Special Tool:

• 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)

STEP 1. Check the SRS warning light.
(1) Disconnect the negative battery terminal.
(2) Connect the negative battery terminal.
(3) Disconnected the SRS-ECU connector E-08.
(4) Turn the ignition switch to the "ON" position.
Q: Does the warning light illuminate?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC 43 sets, replace 
the SRS-ECU (Refer to 

P.52B-215

). Then go to Step 

6.

NO :  Go to Step 2.

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-101

STEP 2. Check the ground line at the SRS-ECU connector 
E-08.
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector E-08.
(3) Connect the negative battery terminal.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly as the connector contact pressure may be 
weakened.
(4) Measure the continuity between terminal 7 and ground.

It should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 3.
NO :  Go to Step 5.

STEP 3. Check the SRS warning light bulb.
Q: Has the SRS warning light bulb blown?

YES : Replace the SRS warning light bulb. Then go to Step 

6.

NO :  Go to Step 4.

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC201527

9 10 11 12

13 1415 16

1 2

3 4

5 6 7 8

17 18 19 20

E-08 HARNESS SIDE 
CONNECTOR (REAR VIEW)

AJ

ACX01667

AT

TEMP

SRS

P
R
N
D

5
4
3
2
1

x1000r/min

2

3

4

5

6

7

8

1

AB

SRS WARNING LIGHT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-102

STEP 4. Check the harness for open circuit between 
ignition switch connector D-204 (terminal No.2) and 
combination meter D-03 (terminal No.62), and between 
combination meter D-04 (terminal No.44) and SRS-ECU 
connector E-08 (terminal No.8).

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204226AG

CLOCK SPRING

CONNECTOR: D-204

D-204

HARNESS 
SIDE 
CONNECTOR
(FRONT VIEW)

2
5

6

3

4

1