Mitsubishi Colt Ralliart. Manual - part 570

 

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Mitsubishi Colt Ralliart. Manual - part 570

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-118

STEP 5. Resistance measurement at the 
SRS-ECU connector B-34

(1) Disconnect SRS-ECU connector B-34.

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the side-airbag mod-
ule (LH) connector C-23 to short the squib 
circuit.

(2) Disconnect left hand side-airbag module (LH) 

connector C-23.

CAUTION

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

between terminals 21, 22 and the short spring to 
release the short spring.

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-34 harness side 

connector terminals 21 and 22

OK: Open circuit

Q: Is the check result normal? 

YES : 

Go to Step 6

NO : 

Repair the harness wires between 
SRS-ECU connector B-34 (terminal No.21 
and 22) and side-airbag module (LH) 
connector C-23 (terminal No.1 and 2).

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 81 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 Malfunctio

P.00-13

).

AC206285

AG

B-34 (Y)

Connector: B-34

Harness side 
connector 
(rear view)

343536373839404142

252627282930313233

2122

2324

AC401575

Connector: C-23

AC

C-23 (R)

2 1

Harness side
connector
(front view)

AC100397

Section
A - A

B-34 Harness side connector
(front view)

Cable tie

Short spring

4 mm or more

Terminal

A

AV

A

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC100386

B-34 Harness side connector
(rear view)

AQ

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-119

Code No.82: Side-airbag module (squib) (LH) system (open-circuited in the squib circuit)

OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the left and right side 
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing 
G-sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag 

module to inflate the side-airbag.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the side-airbag squib 
(LH) wire(s) are open-circuited. However, if no diag-
nosis code resets, the SRS warning lamp will be 
switched off (diagnosis code will be retained).

PROBABLE CAUSES

• Open circuit in the side-airbag module (squib) 

(LH) circuit

• Improper connector contact

• Malfunction of the SRS-ECU

AC510246

AIR BAG DRIVE 
CIRCUIT

MICRO COMPUTER

SRS-ECU

SIDE-AIRBAG
MODULE 
(SQUIB)
(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 : Grey  
R : Red     P : Pink     V : Violet

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK
SWITCH

Side-airbag Module (LH) (Squib) Circuit

AB

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-120

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 the side-airbag module (LH) 

connector C-23.

(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 the C-23 

harness side connector by backprobing.

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

the diagnosis code. 

Q: Is diagnosis code 82 set?

YES : 

Go to Step 2.

NO : 

Replace the frame assembly of the front 
seat (LH) (Refer to GROUP 52A, Front Seat 

P.52A-23

).

STEP 2. Resistance measurement between the 
SRS-ECU connector B-34 (terminal No.21 and 22) 
and the side-airbag module (LH) connector C-23 
(terminal No.1 and 2)

(1) Disconnect SRS-ECU connector B-34.

(2) Disconnect side-airbag module (LH) connector 

C-23.

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 the following 

terminals. 

• SRS-ECU connector B-34 (terminal No.21) 

and the side-airbag module (LH) connector 
C-23 (terminal No.1)

• SRS-ECU connector B-34 (terminal No.22) 

and the side-airbag module (LH) connector 
C-23 (terminal No.2)

OK: Continuity (Less than 2 

)

AC401575

Connector: C-23

AC

C-23 (R)

2 1

Harness side
connector
(front view)

AC006042 CM

MB991866
(Resistor harness)

C-23 

Intermediate h

arness side

connector

MB991865 (Dummy
resistor: 3

 

Ω)

C-23 Side-airbag
module (LH) connector

AC206285

AG

B-34 (Y)

Connector: B-34

Harness side 
connector 
(rear view)

343536373839404142

252627282930313233

2122

2324

AC401575

Connector: C-23

AC

C-23 (R)

2 1

Harness side
connector
(front view)

343536373839404142

252627282930313233

2122

2324

1 2

AC100387

B-34 Harness
side connector
(rear view)

AL

C-23 Harness side 
connector 
(rear view)

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-121

Q: Are the check results normal?

YES : 

Go to Step 3. 

NO : 

Repair the harness wires between 
SRS-ECU connector B-34 (terminal No.21 
and 22) and side-airbag module (LH) 
connector C-23 (terminal No.1 and 2).

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 82 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 Malfunctio

P.00-13

).

Code No.85: Side-airbag module (squib) (LH) system (short-circuited to the power supply)

OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the left and right side 
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing 
G-sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag 

module to inflate the side-airbag.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code is set if the side-airbag squib 
(LH) wire(s) are short-circuited to the power supply.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to the power supply in the side-airbag mod-

ule (LH) (squib) harness

• Malfunction of the SRS-ECU

AC510246

AIR BAG DRIVE 
CIRCUIT

MICRO COMPUTER

SRS-ECU

SIDE-AIRBAG
MODULE 
(SQUIB)
(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 : Grey  
R : Red     P : Pink     V : Violet

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK
SWITCH

Side-airbag Module (LH) (Squib) Circuit

AB

Main

Index

Group

TOC

 

 

 

 

 

 

 

Content   ..  568  569  570  571   ..