Mitsubishi Colt Ralliart. Manual — part 562

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-86

STEP 3. 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 clock spring con-
nector B-136 to short the squib circuit.

(3) Disconnect the clock spring connector B-136.
(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.
(6) Voltage measurement between B-35 harness

side connector terminals 11, 12 and body earth.

OK: 0 V

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the harness wires between
SRS-ECU connector B-35 (terminal No.11
and 12) and clock spring connector B-136
(terminal No.3 and 4).

STEP 4. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 61 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)

AC313828 AF

Connectors: B-136

B-136

Harness side
connector
(rear view)

AC006255

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AV

B-35 Harness side
connector (rear view)

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-87

Code No.62: Driver's 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

via the clock spring to inflate the air bag.

DIAGNOSIS CODE SET CONDITIONS

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

PROBABLE CAUSES

• Malfunction of the clock spring

• Damaged harness wires and connectors

• Short to the earth in the driver's air bag module

(squib) harness

• Malfunction of the SRS-ECU

AC510223

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

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

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

CLOCK
SPRING

SRS-ECU

CONNECTOR
LOCK SWITCH

NOTE

: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Driver's Air Bag Module (Squib) Circuit

AB

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-88

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) By sliding the A section (in the figure) of air bag

module connector B-138 in arrow direction,
disconnect the connector.

(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) Insert special tool (MB991866) into clock spring

side air bag module connector B-138 by
backprobing.

(5) Connect the negative battery terminal.

(6) Erase the diagnosis code memory, and check the

diagnosis code.

Q: Is diagnosis code 62 out put?

YES :

Go to Step 2.

NO :

Replace the driver’s air bag module (Refer
to

P.52B-145

).

STEP 2. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

(2) Disconnect the clock spring connector B-136.

(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) Insert special tool (MB991866) into clock spring

harness side connector B-136 (terminal No.3 and
4) by backprobing.

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

diagnosis code.

Q: Is diagnosis code 62 set?

YES :

Go to Step 3.

NO :

Replace the clock spring (Refer to

P.52B-145

).

AC105823

AC304700

AC305145AF

A

Steering
wheel

B-138 Air bag
module connector

AC300945AG

MB991865
(Dummy resistor : 3

Ω)

MB991866
(Resistor harness)

B-138 Air bag
module
connector

AC313828 AF

Connectors: B-136

B-136

Harness side
connector
(rear view)

AC300949 AF

MB991865 (Dummy
resistor : 3

Ω)

MB991866
(Resistor harness)

B-136 Clock spring
connector

(Rear view)

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-89

STEP 3. Resistance 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 clock spring con-
nector B-136 to short the squib circuit.

(3) Disconnect the clock spring connector B-136.

CAUTION

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

(4) Check for continuity between B-35 harness side

connector terminals 11, 12 and body earth.

OK: Open circuit

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the harness wires between
SRS-ECU connector B-35 (terminal No.11
and 12) and clock spring connector B-136
(terminal No.3 and 4).

STEP 4. Check whether the diagnosis code is
reset.

Q: Is diagnosis code 62 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)

AC313828 AF

Connectors: B-136

B-136

Harness side
connector
(rear view)

AC006256

13 14 15 16 17 18 19 20

5 6 7 8 9 10 11 12

1 2

3 4

AU

B-35 Harness side
connector (rear view)

Main

Index

Group

TOC