Mitsubishi Colt Ralliart. Manual — part 564

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-94

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the harness wires between
SRS-ECU connector B-35 (terminal No.9
and 10) and passenger's (front) air bag
module connector B-06 (terminal No.1 and
2).

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 65 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

).

Code No.66: Driver's seat belt pre-tensioner (squib) system (short-circuited to the power supply)

OPERATION

The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the driver's seat belt
pre-tensioner wire(s) are short-circuited to the power
supply.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to the power supply in the driver's seat belt

pre-tensioner (squib) harness

• Malfunction of the SRS-ECU

AC510230

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

SEAT BELT
PRETENSIONER
(RH)

SRS-ECU

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

NOTE

: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Driver's Seat Belt Pre-Tensioner (Squib)

AB

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-95

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

(2) Disconnect driver's seat belt pre-tensioner

connector C-28. Use a flat-tipped screwdriver to
pull out the locking button at the harness side
connector, and then disconnect the connector.

(3) Connect special tool dummy resistor (MB991865)

to special tool resistor harness (MB991884).

(4) Connect special tool (MB991884) to the C-28

harness side connector.

(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and check the

diagnosis code.

Q: Is diagnosis code 66 set?

YES :

Go to Step 2.

NO :

Replace the driver's seat belt with
pre-tensioner (Refer to

P.52B-159

).

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

(2) Disconnect SRS-ECU connector B-35.

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the driver’s seat belt
pre-tensioner connector C-28 to short the
squib circuit.

(3) Disconnect driver's seat belt pre-tensioner

connector C-28. Use a flat-tipped screwdriver to
pull out the locking button at the harness side
connector, and then disconnect the connector.

(4) Connect the negative battery terminal.

AC207222 AF

Harness side
connector
(front view)

Connector: C-28

C-28 (B)

Centre

pillar

AC208430AE

Pre-tensioner

connector

Locking

button

Harness side

connector

Flat-tipped

screwdriver

MB991865
(Dummy resistor : 3

Ω)

C-28 Harness side
connectors

MB991884
(Resistor
harness)

AF

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC207222 AF

Harness side
connector
(front view)

Connector: C-28

C-28 (B)

Centre

pillar

AC208430AE

Pre-tensioner

connector

Locking

button

Harness side

connector

Flat-tipped

screwdriver

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-96

(5) 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.
(6) Voltage measurement between B-35 harness

side connector terminals 7, 8 and body earth.

OK: 0 V

Q: Is the measured voltage within the specified

range?
YES : .

Go to Step 3.

NO : .

Repair the harness wire between SRS-ECU

connector B-35 (terminal Nos.7 and 8) and
driver’s seat belt pre-tensioner connector
C-28 (terminal Nos.1 and 2).

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 66 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

).

13 14

16 17

19 20

5 6 7 8 9 10 11 12

1 2

3 4

18

15

AC208914 AE

B-35 Harness side
connector (rear view)

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-97

Code No.67: Driver's seat belt pre-tensioner (squib) system (short-circuited to the earth)

OPERATION

The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the driver's seat belt
pre-tensioner wire(s) are short-circuited to the earth.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to the earth in the driver's seat belt pre-ten-

sioner (squib) harness

• Malfunction of the SRS-ECU

AC510230

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

SEAT BELT
PRETENSIONER
(RH)

SRS-ECU

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

NOTE

: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Driver's Seat Belt Pre-Tensioner (Squib)

AB

Main

Index

Group

TOC