Mitsubishi Colt Ralliart. Manual - part 571

 

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Mitsubishi Colt Ralliart. Manual - part 571

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-122

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 the diagnosis code memory, and check the 

diagnosis code.

Q:  Is diagnosis code 85 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. Voltage 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.

(3) Connect the negative battery terminal.
(4) 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.
(5) Voltage measurement between B-34 harness 

side connector terminals 21, 22 and body earth.

OK: 0 V

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)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC208820

B-34 Harness side 
connector (rear view)

AE

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-123

Q: Is the check result 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 85 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.86: Side-airbag module (squib) (LH) system (short-circuited to the earth)

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 earth.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to earth in the left hand side-airbag module 

(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

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-124

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 the diagnosis code memory, and check the 

diagnosis code.

Q:  Is diagnosis code 86 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 at the 
SRS-ECU connector B-34

(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) Check for continuity between B-34 harness side 

connector terminals 21, 22 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 B-34 (terminal No.21 
and 22) and side-airbag module (LH) 
connector C-23 (terminal No.1 and 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)

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC100392

B-34 Harness side 
connector (rear view)

AR

Main

Index

Group

TOC

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-125

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 86 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.89: Side impact sensor (RH) communication error 

 

Code No.96: Side impact sensor (RH) communication impossible

OPERATION

The side impact sensor includes an analogue G-sen-
sor and CPU, etc. The CPU monitors the analogue 
G-sensor output signal. If the CPU judges that the 
side-airbags should be deployed, it sends a fire sig-
nal to the SRS-ECU to deploy the side-airbags. 
Besides that, the CPU diagnoses the internal compo-
nents of the side impact sensor. If a malfunction 
occurs, it requests the SRS-ECU to set a diagnosis 
code.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes are set if communication 
between the side impact sensor (RH) and the 
SRS-ECU is not possible or faulty.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the side impact sensor (RH)

• Malfunction of the SRS-ECU

AC510252

MICRO COMPUTER

INTERFACE 
CIRCUIT

CPU

SRS-ECU

ANALOGUE
G SENSOR

EEP ROM

SIDE IMPACT
SENSOR (RH)

CONSTANT
VOLTAGE CIRCUIT

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   

Side Impact Sensor (RH) Circuit

AB

Main

Index

Group

TOC

 

 

 

 

 

 

 

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