Mitsubishi Montero (2002-2004). Manual - part 799

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-65

STEP 7. Check the harness wires between SRS-ECU 
connector E-08 (terminal No.13) and junction block 
connector D-209 (terminal No.10).
Q: Are harness wires between SRS-ECU connector E-08 

(terminal No.13) and junction block connector D-209 
(terminal No.10) in good condition?
YES : Go to Step 8.
NO :  Repair the harness wires between SRS-ECU 

connector E-08 and junction block connector D-209. 
Then go to Step 8.

STEP 8. Recheck for diagnostic trouble code.
Q: Is DTC 42 set?

YES : Replace the SRS-ECU. Refer to 

P.52Ba-31

.

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

.) 

ACX01478AH

CONNECTOR: E-08

E-08 (Y)

HARNESS
CONNECTOR:
HARNESS SIDE

AC204257

CONNECTOR : D-209

AF

D-209

D-209 HARNESS CONNECTOR:
COMPONENT SIDE

JUNCTION BLOCK
(FRONT VIEW)

5 4 3

2

12

13

10

11

7

8

1

6

9

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-66

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) DIAGNOSIS

52Bb-67

.

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 automati-
cally 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:

• MB991502: Scan Tool (MUT-ll)

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.52Ba-31

.) Then go to Step 

6.

NO :  Go to Step 2.

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-68

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 :  Then 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.

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC201527

9 10 11 12

13 1415 16

1 2

3 4

5 6 7 8

17 18 19 20

E-08 HARNESS CONNECTOR: 
HARNESS SIDE

AD

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