Mitsubishi Colt Ralliart. Manual — part 558

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-70

Code No.34: SRS-ECU connector lock out of order

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if a poor connection at the
SRS-ECU is detected. However, if the vehicle condi-
tion returns to normal, diagnosis code number 34 will
be automatically erased, and the SRS warning lamp
will go out.

PROBABLE CAUSES

• Damaged connectors

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector lock check: SRS-ECU
connector B-35. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

(2) Disconnect SRS-ECU connectors B-35 and then

reconnect them.

(3) Connect the negative battery terminal.
(4) Erase diagnosis code memory, and then check

the diagnosis code.

Q: Is diagnosis code 34 set?

YES :

Go to Step 2.

NO :

The procedure is complete. It is assumed
that diagnosis code 34 set as connector
B-35 was engaged improperly.

STEP 2. Connector lock check: SRS-ECU
connector B-35.

(1) Disconnect SRS-ECU connectors B-35.
(2) Check the connector lock switch terminal inside

the harness side connector for improper contact
or deformation.

Q: Are the SRS-ECU connector B-35 in good

condition?
YES :

Go to Step 3.

NO :

Repair the SRS-ECU connector B-35.

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 34 set?

YES :

Replace the SRS-ECU (Refer to

P.52B-143

).

NO :

An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction

P.00-13

).

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC006249 AM

SRS-ECU Harness side connector
(front view)

Connector lock
switch terminal

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-71

Code No.35: Ignition of the air bag completed

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set after the air bag has
deployed. If this diagnosis code is set before the air
bag has deployed, the cause is probably a malfunc-
tion inside the SRS-ECU.

PROBABLE CAUSE

Malfunction of the SRS-ECU

DIAGNOSIS

Replace the SRS-ECU. (Refer to

P.52B-143

).

Code No.39 Airbags Deployed Simultaneously

DIAGNOSIS CODE SET CONDITIONS

This code is set when the airbags have deployed
simultaneously. If this code is set before the airbags
have deployed, an internal failure may have occurred
in the SRS-ECU.

PROBABLE CAUSE

Malfunction of the SRS-ECU

DIAGNOSIS

Replace the SRS-ECU (Refer to

P.52B-143

).

Code No.41: Power supply voltage (IG1 (A) voltage) drops abnormally.

AC510234

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet

IGNITION
SWITCH (IG1)

SRS-ECU

IG1 Power Supply Circuit System

AB

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-72

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.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the voltage between the
IG1 terminals (fuse No.40 circuit) and earth is lower
than a predetermined value for a continuous period
of 5 second or more. However, if the system returns
to normal condition, code number 41 will be erased
automatically and the SRS warning lamp will go out.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check junction block fuse number 40.

Q: Is the fuse burned out?

YES :

Go to Step 4.

NO :

Go to Step 2.

STEP 2. Voltage measurement at the SRS-ECU
connector B-35.
(1) Disconnect the negative battery terminal.

(2) Disconnect SRS-ECU connector B-35.
(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) Voltage measurement between B-35 harness

side connector terminal 16 and body earth.

OK: 9 V or more.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 3.

AC207473

AD

Junction
block

Fuse No.40

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC203786

B-35 Harness side connector
(rear view)

AH

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-73

STEP 3. Connector check: SRS-ECU connector
B-35 and ignition switch connector B-141,
junction block connector B-129 and B-131.

Q: Is the check result normal?

YES :

Check the harness wires for open circuit

between SRS-ECU connector B-35
(terminal No.16) and ignition switch
connector B-141 (terminal No.2), and repair
if necessary.

NO :

Repair or replace it.

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 7.

NO :

Go to Step 5.

STEP 5. Resistance measurement at the junction
block connector B-131

(1) Disconnect junction block connector B-131, and

measure at the wiring harness side.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(2) Resistance measurement between terminal 31

and body earth.

OK: Open circuit

Q: Is the check result normal?

YES :

Check the other circuit which flows through

fuse number 40.

NO :

Go to Step 6.

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC313828 AG

Connector: B-141

Harness side
connector
(front view)

Clock spring

AC313827AH

B-131

B-131

B-129

Connectors: B-129, B-131

Junction block (Rear view)

Harness side

Harness side

B-129

AC313826

Connector: B-131

Junction Block (Rear view)

Harness side

AI

16

34

21

19

1

20

2

28

4

22

3

23

5

9

27

26

8

10

13

31

12

30

29

11

15

33

32

14

35

17

36

18

7

25

6

24

AC208768AC

B-131 Harness side connector (rear view)

Main

Index

Group

TOC