Mitsubishi Colt Ralliart. Manual — part 563

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-90

Code No.64: Passenger's (front) air bag module (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 SRS
air bag will inflate.

• The ignition signal is input to the air bag module

to inflate the air bag.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the passenger's (front)
air bag squib wire(s) are short-circuited to the power
supply.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the power supply in the passenger's

(front) air bag module (squib) harness

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

(2) Unclip passenger’s (front) air bag module

connector B-06.

AC510225

CONNECTOR
LOCK SWITCH

AIR BAG MODULE
(SQIUB)
(PASSENGER'S SIDE)

SRS-ECU

CONNECTOR
LOCK SWITCH

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

NOTE

: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Passenger's (Front) Air Bag Module (Squib) Circuit

AB

AC206286

Connector: B-06

2 1

Harness side
connector (front view)

B-06 (R)

AE

Glove box striker

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-91

(3) Connect special tool dummy resistor (MB991865)

to special tool resistor harness (MB991866).

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Disconnect the passenger's (front) air bag

module connector B-06, and insert special tool
(MB991866) into the harness side connector by
backprobing.

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

diagnosis code.

Q: Is diagnosis code 64 set?

YES :

Go to Step 2.

NO :

Replace the passenger's (front) air bag
module (Refer to

P.52B-145

).

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

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

CAUTION

To prevents the air bag from deploying uninten-
tionally, disconnect the passenger’s (front) air
bag module connector B-06 to short the squib
circuit.
(3) Disconnect the passenger's (front) air bag

module connector B-06.

(4) Connect the negative battery terminal.
(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.

AC300956 AN

MB991865
(Dummy resistor: 3 )

MB991866

(Resistor harness)

B-06
Passenger's (front)
air bag module connector

B-06

Harness side

connector

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC206286

Connector: B-06

2 1

Harness side
connector (front view)

B-06 (R)

AE

Glove box striker

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AC006257AT

B-35 Harness side
connector (rear view)

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-92

(6) Voltage measurement between B-35 harness

side connector terminals 9, 10 and body earth.

OK: 0 V

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 64 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.65: Passenger's (front) air bag module (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 SRS
air bag will inflate.

• The ignition signal is input to the air bag module

to inflate the air bag.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the passenger's (front)
air bag squib wire(s) are short-circuited to the earth.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the earth in the passenger's (front) air

bag module (squib) harness

• Malfunction of the SRS-ECU

AC510225

CONNECTOR
LOCK SWITCH

AIR BAG MODULE
(SQIUB)
(PASSENGER'S SIDE)

SRS-ECU

CONNECTOR
LOCK SWITCH

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

NOTE

: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Passenger's (Front) Air Bag Module (Squib) Circuit

AB

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-93

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) Unclip passenger’s (front) air bag module

connector B-06.

(3) Connect special tool dummy resistor (MB991865)

to special tool resistor harness (MB991866).

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Disconnect the passenger's (front) air bag

module connector B-06, and insert special tool
(MB991866) into the harness side connector by
backprobing.

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

diagnosis code.

Q: Is diagnosis code 65 set?

YES :

Go to Step 2.

NO :

Replace the passenger's (front) air bag
module (Refer to

P.52B-145

).

STEP 2. Resistance measurement at the
SRS-ECU connector B-35.

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

CAUTION

To prevents the air bag from deploying uninten-
tionally, disconnect the passenger’s (front) air
bag module connector B-06 to short the squib
circuit.
(2) Unclip passenger’s (front) air bag module

connector B-06.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(3) Resistance measurement between B-35 harness

side connector terminals 9, 10 and body earth.

OK: Open circuit

AC206286

Connector: B-06

2 1

Harness side
connector (front view)

B-06 (R)

AE

Glove box striker

AC300956 AN

MB991865
(Dummy resistor: 3 )

MB991866

(Resistor harness)

B-06
Passenger's (front)
air bag module connector

B-06

Harness side

connector

AC206285

AF

B-35 (Y)

Connector: B-35

Harness side
connector
(rear view)

AC206286

Connector: B-06

2 1

Harness side
connector (front view)

B-06 (R)

AE

Glove box striker

AC006258

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AT

B-35 Harness
side connector
(rear view)

Main

Index

Group

TOC