Mitsubishi Montero (2002-2004). Manual — part 798

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-61

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:

• MB991502: Scan Tool (MUT-ll)

• MB991223 (MB991222): Harness set (Probe)

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

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

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.52Ba-31

.) Then go to Step

8.

NO : Go to Step 3.

AC203896AD

JUNCTION
BLOCK

FUSE No.8

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC203280

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC

E-08 HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-62

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).
NOTE: After inspecting junction block connectors D-209 and D-
208, inspect the wiring harness. If junction block connectors
are damaged, repair or replace them. Refer to GROUP 00E,
Harness Connector Inspection

P.00E-2

. Then go to Step 8.

Q: Is the harness wire between SRS-ECU connector E-08

(terminal No.13) and the ignition switch connector D-
204 (terminal No.2) in good condition?
YES : Go to Step 8.
NO : Repair the harness wire between SRS-ECU

connector E-08 and the ignition switch connector D-
204. Then go to Step 8.

AC204257

CONNECTORS : D-208, D-209

AE

D-209

D-208

D-208 HARNESS CONNECTOR:
COMPONENT SIDE

D-209 HARNESS CONNECTOR:
COMPONENT SIDE

1

2

3

5

6

4

JUNCTION BLOCK
(FRONT VIEW)

5 4 3

2

12

13

10

11

7

8

1

6

9

ACX01478AH

CONNECTOR: E-08

E-08 (Y)

HARNESS
CONNECTOR:
HARNESS SIDE

AC204226AE

CLOCK SPRING

CONNECTOR: D-204

D-204

HARNESS
CONNECTOR:
COMPONENT
SIDE

2
5

6

3

4

1

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-63

STEP 4. Check a burned-out fuse.
(1) Replace the fuse.
(2) Turn the ignition switch to the "ON" position, wait for at least

one minute and then turn the ignition switch to the "LOCK"
(OFF) position.

(3) Check the fuse.
Q: Is the fuse in good condition?

YES : Go to Step 8.
NO : Go to Step 5.

STEP 5. Check the circuit between the SRS-ECU and the
junction block connector D-209.
(1) Disconnect junction block connector D-209, and measure at

the wiring harness.

CAUTION

Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(2) Check for continuity between D-209 harness connector

terminal 10 and body ground.
It should be open circuit.

Q: Is the circuit normal?

YES : Check the other circuit, which flows through fuse

number 8.

NO : Go to Step 6.

ACX01632

CONNECTOR: D-209

AI

JUNCTION BLOCK
(FRONT VIEW)

D-209

AC204459

5

4

3

2

12 13

10 11

7 8

1

6

9

AB

D-209 HARNESS
CONNECTOR:
HARNESS SIDE

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-64

STEP 6. Check the power supply circuit for short circuit to
ground at the SRS-ECU connector E-08.
(1) Disconnect SRS-ECU connector E-08, and measure at the

wiring harness.

CAUTION

Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(2) Check for continuity between terminal 13 and body ground.

It should be open circuit.

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check

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

P.52Ba-31

.) Then go to Step

8.

NO : Go to Step 7.

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

AC202026

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AE

E-08 HARNESS CONNECTOR:
HARNESS SIDE