Mitsubishi Montero (2004+). Manual — part 1189

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-91

STEP 7. Check the harness for short circuit ground
between SRS-ECU connector E-08 (terminal No.16) and
junction block connector D-210 (terminal No.2).
Q: Are harness wires between SRS-ECU connector E-08

(terminal No.16) and junction block connector D-210
(terminal No.2) in good condition?
YES : Go to Step 8.
NO : Repair the harness wire between SRS-ECU

connector E-08 and junction block connector D-210.
Then go to Step 8.

STEP 8. Recheck for diagnostic trouble code.
Q: Is DTC 41 set?

YES : Return to Step 1.
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

).

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC204257

CONNECTOR : D-210

AK

D-210

D-210 HARNESS SIDE
CONNECTOR (FRONT VIEW)DE

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)

52B-92

DTC 42: IG1 Power Circuit System (Fuse No.8 Circuit)

.

CIRCUIT OPERATION

• The SRS-ECU is powered from the ignition

switch (IG1).

• The SRS-ECU power is supplied from two cir-

cuits. Even if one circuit is shut off, the air bag
can inflate.

.

ACX01631

IG1 Power Circuit System (Fuse No.8 Circuit)

AC

ACX01632

CONNECTORS: D-208, D-210

D-208

D-210

JUNCTION BLOCK
(FRONT VIEW)

AG

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-93

DTC SET CONDITIONS
This DTC is set if the voltage between the IG1 termi-
nals (fuse No.8 circuit) and ground is lower than a
predetermined value for a continuous period of five
second or more. However, if the vehicle condition
returns to normal, DTC number 42 will be automati-
cally erased, and the SRS warning light will switch
off.

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tools:

• 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)

• MB991223 (MB991222): Harness set (Probe)

STEP 1. Check junction block fuse number 8.
Q: Is the fuse burned out?

YES : Go to Step 4.
NO : Go to Step 2.

AC203896AD

JUNCTION
BLOCK

FUSE No.8

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-94

STEP 2. Check the harness for open circuit between the
SRS-ECU and the ignition switch (IG1).
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector E-08.
(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(5) Measure the voltage between E-08 harness connector

terminal 13 and body ground.
Voltage should measure 9 volts or more.

Q: Is the measured voltage within the specified range?

YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC 42 sets, replace
the SRS-ECU (Refer to

P.52B-215

). Then go to Step

8.

NO : Go to Step 3.

STEP 3. Check the harness for open circuit between
SRS-ECU connector E-08 (terminal No.13) and the ignition
switch connector D-204 (terminal No.2).

ACX01478AM

CONNECTOR: E-08

E-08 (Y)

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC203280

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AG

E-08 HARNESS SIDE
CONNECTOR
(REAR VIEW)

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