Mitsubishi L200. Manual - part 607

 

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Mitsubishi L200. Manual - part 607

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-99

STEP 3. Resistance measurement between the 
SRS-ECU connector C-154 (terminal No.27 and 
28) and the clock spring connector C-305 
(terminal No.3 and 4)
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect SRS-ECU connector C-154.

AC903858AD

Connector: C-305 <LHD>

Harness side 
connector 
(front view)

C-305 (Y)

AC903869AD

Connector: C-305 <RHD>

Harness side 
connector 
(front view)

C-305 (Y)

C-305

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the clock spring con-
nector C-305 to short the squib circuit.

(3) Disconnect the clock spring connector C-305.

AC801565

Section
A - A

C-154 Harness side connectors
(front view)

Cable tie

Terminal

 7 mm or more

AD

Short spring

A

A

CAUTION

Insert an insulator such as a cable tie to a depth 
of 7 mm or more, otherwise the short spring will 
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick] 

between terminals 27, 28 and the short spring to 
release the short spring.

AC800962 BG

C-154 
Harness side 
connector 
(rear view)

C-305
Harness side 
connector 
(rear view)

CAUTION

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

terminals. 

• SRS-ECU connector C-154 terminal No.27 

and the clock spring connector C-305 terminal 
No.3

• SRS-ECU connector C-154 terminal No.28 

and the clock spring connector C-305 terminal 
No.4

OK: Continuity (Less than 2 

Ω)

Q: Are the check results normal? 

YES : 

Go to Step 4. 

NO : 

Repair the harness wires between SRS-
ECU connector C-154 (terminal No.27 and 
28) and clock spring connector C-305 
(terminal No.3 and 4).

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1401 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-100

YES : 

Replace the SRS-ECU (Refer to 

P.52B-

266

).

NO : 

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

Code No.B1402: Driver's air bag module (squib) system (short-circuited to the earth)

AC805793

Driver's Air Bag Module (Squib) Circuit

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

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     PU : Purple

AB

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

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-101

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.

AC501669

A

C-303 Air bag 
module connector

AB

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

module connector C-303 in arrow direction, 
disconnect the connector.

AC303006AF

C-303 Air bag

module

connector

MB991865

(Dummy 

resistor : 3   )

MB991866 
(Resistor harness)

(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 C-303 by 
backprobing.

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

diagnosis code.

Q:  Is diagnosis code B1402 set?

YES : 

Go to Step 2.

NO : 

Replace the driver’s air bag module (Refer 
to 

P.52B-268

). 

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

AC903858AD

Connector: C-305 <LHD>

Harness side 
connector 
(front view)

C-305 (Y)

AC903869AD

Connector: C-305 <RHD>

Harness side 
connector 
(front view)

C-305 (Y)

C-305

(2) Disconnect the clock spring connector C-305.

AC303587AM

C-305 Clock spring 

connector

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)

(Rear view)

(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 C-305 (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 B1402 set?

YES : 

Go to Step 3.

NO : 

Replace the clock spring (Refer to 

P.52B-

268

).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-102

STEP 3. Resistance measurement at the SRS-
ECU connector C-154.
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect SRS-ECU connector C-154.

AC903858AD

Connector: C-305 <LHD>

Harness side 
connector 
(front view)

C-305 (Y)

AC903869AD

Connector: C-305 <RHD>

Harness side 
connector 
(front view)

C-305 (Y)

C-305

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the clock spring con-
nector C-305 to short the squib circuit.

(3) Disconnect the clock spring connector C-305.

AC801565

Section
A - A

C-154 Harness side connectors
(front view)

Cable tie

Terminal

 7 mm or more

AD

Short spring

A

A

CAUTION

Insert an insulator such as a cable tie to a depth 
of 7 mm or more, otherwise the short spring will 
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick] 

between terminals 27, 28 and the short spring to 
release the short spring.

AC800962 BH

C-154 Harness side connector 
(rear view)

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(5) Check for continuity between C-154 harness side 

connector terminals 27, 28 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 C-154 (terminal No.27 and 
28) and clock spring connector C-305 
(terminal No.3 and 4).

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1402 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-

266

).

NO : 

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

 

 

 

 

 

 

 

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