Mitsubishi Outlander (2013+). Manual - part 593

 

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Mitsubishi Outlander (2013+). Manual - part 593

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-23

lever, and disconnect the SRS-ECU connector.

CAUTION

To release SRS-ECU connector short spring in 
the following operations, disconnect this clock 
spring connector, and keep the squib circuit 
shorted.
(3) Disconnect the clock spring connector.

AC905150 AO

A

A

Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

CAUTION

The short spring may not be released due to the 
insufficient insertion. Therefore, insert the insu-
lator for 4 mm or more.
(4) Insert the insulator (width: 3 mm, thickness: 0.5 

mm) such as cable tie between the DQ1-, DQ1+ 
line, and then release the short spring.

(5) Take the measurements below at the SRS-ECU 

harness side connector.
Continuity between DQ1-, DQ1+ line and body 
earth 

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Repair the wiring harnesses DQ1-, DQ1+ 
line between the clock spring connector and 
the SRS-ECU connector.

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1402 set?

YES : 

Replace SRS-ECU (Refer to 

P.52B-129

).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B1403 Driver's air bag module (squib) system (shorted to squib circuit power supply)

CAUTION

If the diagnosis code B1403 is set to SRS-ECU, 
be sure to diagnose the CAN bus line.

OPERATION

Only when the frontal impact exceeding the threshold 
is simultaneously detected (turned ON) by the front 
impact sensor as well as by the analogue G-sensor 
and safing G-sensor in SRS-ECU, the electric cur-
rent is supplied from SRS-ECU to the driver's air bag 
module (squib).

TROUBLE JUDGEMENT

The code is set when the input terminal of SRS-ECU 
driver's air bag module (squib) shorted to power sup-
ply.

PROBABLE CAUSES

• Damaged clock spring

• Damaged wiring harness and connectors

• Driver's air bag module (squib) harness shorted 

to power supply

• Malfunction of SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 2. Check whether the diagnosis code is 
reset.
(1) Connect the negative battery terminal.
(2) After erasing the diagnosis code memory, check 

the diagnosis code again.

(3) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1403 set?

YES : 

Go to Step 3

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

STEP 3. Diagnosis check by dummy resistor 
connection.

(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-24

connected, disconnect it.

ACB04316 AB

Driver's air bag module 
harness side connector

Locking button

Flat-tipped
screwdriver

(2) Use the flat-tipped screwdriver to pull out the 

locking button of wiring harness side connector, 
and release the lock.

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

CAUTION

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

AC905251 AC

MB991865 
(Dummy resistor: 3   )

MB991866 
(Resistor harness)

Air bag 
module connector

(4) Insert the resistor harness probe (special tool) as 

shown.

(5) Connect the negative battery terminal.
(6) After erasing the diagnosis code memory, check 

the diagnosis code again.

(7) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1403 set?

YES : 

Go to Step 4

NO : 

Replace the driver's air bag module (Refer 
to 

P.52B-131

).

STEP 4. Diagnosis check by dummy resistor 
connection.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 
connected, disconnect it.

(2) Disconnect the clock spring connector.

AC905254 AC

MB991865 
(Dummy resistor: 3   )

MB991866 
(Resistor harness)

Clock spring
connector

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991866).

CAUTION

Do not insert a probe directly into the terminal 
from the connector front side as the connector 
contact pressure may be weakened.
(4) Insert the resistor harness probe from the back of 

clock spring harness side connector DQ1-, DQ1+ 
line.

(5) Connect the negative battery terminal.
(6) After erasing the diagnosis code memory, check 

the diagnosis code again.

(7) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1403 set?

YES : 

Go to Step 5

NO : 

Replace the clock spring (Refer to 

P.52B-131

).

STEP 5. Voltage measurement at the SRS-ECU 
connector.
(1) Check that the negative battery terminal is 

disconnected. If the negative battery terminal is 
connected, disconnect it.

AC905015

A

AC

Lock lever

(2) While pushing the part "A" indicated in the figure 

of the harness side connector, turn the lock lever 
to the direction of the arrow to release the lock 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-25

lever, and disconnect the SRS-ECU connector.

CAUTION

To release SRS-ECU connector short spring in 
the following operations, disconnect this clock 
spring connector, and keep the squib circuit 
shorted.
(3) Disconnect the clock spring connector.

AC905150 AO

A

A

Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

CAUTION

The short spring may not be released due to the 
insufficient insertion. Therefore, insert the insu-
lator for 4 mm or more.
(4) Insert the insulator (width: 3 mm, thickness: 0.5 

mm) such as cable tie between the DQ1-, DQ1+ 

line, and then release the short spring.

(5) Connect the negative battery terminal.
(6) Ignition switch: ON
(7) Take the measurements below at the SRS-ECU 

harness side connector.

• Voltage between DQ1-, DQ1+ line and body 

earth

OK: 1 V or less

(8) Disconnect the negative battery terminal.

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Repair the wiring harnesses DQ1-, DQ1+ 
line between the clock spring connector and 
the SRS-ECU connector.

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1403 set?

YES : 

Replace SRS-ECU (Refer to 

P.52B-129

).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-26

Code No.B1404: Driver's air bag module (squib) activating circuit short-circuited

 

Code No.B1405: Driver's air bag module (squib) activating circuit open-circuited

 

Code No.B1414: Passenger's (front) air bag module (1st squib) activating circuit short-circuited

 

Code No.B1415: Passenger's (front) air bag module (1st squib) activating circuit open-circuited

 

Code No.B1424: Right side-airbag module (squib) activating circuit short-circuited

 

Code No.B1425: Right side-airbag module (squib) activating circuit open-circuited

 

Code No.B1434: Left side-airbag module (squib) activating circuit short-circuited

 

Code No.B1435: Left side-airbag module (squib) activating circuit open-circuited

 

Code No.B1444: Right curtain air bag module (squib) activating circuit short-circuited

 

Code No.B1445: Right curtain air bag module (squib) activating circuit open-circuited

 

Code No.B1454: Left curtain air bag module (squib) activating circuit short-circuited

 

Code No.B1455: Left curtain air bag module (squib) activating circuit open-circuited

 

Code No.B1466: Analog G-sensor malfunction

 

Code No.B1478: SRS-ECU backup capacitor circuit voltage too High

 

Code No.B1479: SRS-ECU backup capacitor circuit voltage too Low

 

Code No.B1494: Passenger's (front) air bag (2nd squib) activating circuit short-circuited

 

Code No.B1495: Passenger's (front) air bag (2nd squib) activating circuit open-circuited

 

Code No.B1496: SRS-ECU non-volatile memory (EEPROM)

 

Code No.B1497: SRS-ECU application specific integrated circuit (for frontal activation)

 

Code No.B1498: SRS-ECU abnormal condition in ROM or RAM

 

Code No.B1547: Passenger’s air bag cut off activating circuit 

 

Code No.B1557: SRS-ECU application specific integrated circuit 

 

Code No.B1588: SRS-ECU backup capacitor system (Up converter unit) 

 

Code No.B1589: SRS-ECU backup capacitor system (Down converter unit) 

 

Code No.B1590: SRS-ECU backup capacitor system (capacitance big) 

 

Code No.B1591: SRS-ECU backup capacitor system (capacitance small)

 

Code No.B1607: Seat belt pre-tensioner (driver’s side) activating circuit short-circuited

 

Code No.B1608: Seat belt pre-tensioner (driver’s side) activating circuit open-circuited

 

Code No.B1613: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit short-circuited

 

Code No.B1614: Seat belt pre-tensioner (passenger’s side) (squib) activating circuit open-circuited

 

Code No.B1635: Driver's knee air bag (squib) activating circuit short-circuited

 

Code No.B1636: Driver's knee air bag module (squib) activating circuit open-circuited

CAUTION

If diagnosis codes is set in the SRS-ECU, always 
diagnose the CAN main bus line.

DIAGNOSIS CODE SET CONDITIONS

• These diagnosis code are set when a fault is 

detected in the SRS-ECU. The most likely 
causes for this code to be set are shown in the 
table below:

PROBABLE CAUSE

• Malfunction of the SRS-ECU

Code No. Part/Circuit integral to SRS-ECU

Trouble causes

B1404

Driver's air bag module (squib ignition 
drive circuit)

• Short circuit in the squib ignition drive circuit

B1405

• Open circuit in the squib ignition drive circuit

B1414

Passenger's (front) air bag module 
(1st squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1415

• Open circuit in the squib ignition drive circuit

B1424

Side-airbag module (RH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1425

• Open circuit in the squib ignition drive circuit

B1434

Side-airbag module (LH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1435

• Open circuit in the squib ignition drive circuit

 

 

 

 

 

 

 

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