Mitsubishi Lancer Evolution IX. Manual — part 641

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-77

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the harness wires between
SRS-ECU connector C-12 (terminal No.9
and 10) and passenger's (front) air bag
module connector C-106 (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-109

).

NO :

An intermittent malfunction is suspected
(Refer to GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

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 outputs an ignition signal. At this time,
if the front air bag safing G-sensor is on, the SRs
(front) air bag will inflate.

• The ignition signal is input to the air bag module

spring 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

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK
SWITCH

AIR BAG DRIVE
CIRCUIT

MICROCOMPUTER

SRS-ECU

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

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

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

NOTE

: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

: LH drive vehicles
: RH drive vehicles

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-78

DIAGNOSIS PROCEDURE

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

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

connector C-106.

(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 C-106, 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-110

).

STEP 2. Resistance measurement at the
SRS-ECU connector C-12

(1) Disconnect SRS-ECU connector C-12.

CAUTION

To prevents the air bag from deploying uninten-
tionally, disconnect the passenger’s (front) air
bag module connector C-106 to short the squib
circuit.
(2) Disconnect passenger’s (front) air bag module

connector C-106.

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.

AC100985

Connector: C-106

Glove box striker

2

1

Harness side
connector (rear view)

C-106 (R)

AQ

AC300956AL

MB991865
(Dummy resistor: 3 )

MB991866

(Resistor harness)

C-106 Passenger's (front)
air bag module connector

C-106 Harness side

connector

AC101950AJ

SRS-ECU

Harness side
connector
(rear view)

C-12 (Y)

Connector: C-12

AC100985

Connector: C-106

Glove box striker

2

1

Harness side
connector (rear view)

C-106 (R)

AQ

AC006258

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AR

C-12 Harness side connector
(rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-79

(3) Resistance measurement between C-12 harness

side connector terminals 9, 10 and body earth.

OK: Open circuit

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the harness wires between
SRS-ECU connector C-12 (terminal No.9
and 10) and passenger's (front) air bag
module connector C-106 (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-109

).

NO :

An intermittent malfunction is suspected
(Refer to GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

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

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK
SWITCH

AIR BAG DRIVE CIRCUIT

MICROCOMPUTER

SRS-ECU

SEAT BELT
PRE-TENSIONER
(LH)

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

NOTE

: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

Driver's Seat Belt Pre-Tensioner (Squib) (LHD)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-80

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 outputs an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the seat belt 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

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK
SWITCH

AIR BAG DRIVE CIRCUIT

MICROCOMPUTER

SRS-ECU

SEAT BELT
PRE-TENSIONER
(RH)

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

NOTE

: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

Driver's Seat Belt Pre-Tensioner (Squib) (RHD)