Mitsubishi Outlander (2013+). Manual - part 594

 

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Mitsubishi Outlander (2013+). Manual - part 594

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-27

DIAGNOSIS PROCEDURE

Replace the SRS-ECU.

B1444

Curtain air bag module (RH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1445

• Open circuit in the squib ignition drive circuit

B1454

Curtain air bag module (LH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1455

• Open circuit in the squib ignition drive circuit

B1466

Analog G-sensor (front air bag)

• When the analog G-sensor is not operating

• When the characteristics of the analog G-sensor are 

abnormal

• When the output from the analog G-sensor is 

abnormal

B1478

Capacitor

• Voltage at the capacitor terminal is higher than the 

specified value for five seconds or more

B1479

• Voltage at the capacitor terminal is lower than the 

specified value for five seconds or more (This is not 
detected if diagnosis code B1476 or B1477 indicating 
battery positive voltage drop has been set).

B1494

Passenger's (front) air bag module 
(2nd squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1495

• Open circuit in the squib ignition drive circuit

B1496

Non-volatile memory (EEPROM)

• When EEPROM communication error occurs

B1497

Application specific integrated circuit 
(for frontal activation)

• When the application specific integrated circuit 

(frontal activation) are abnormal

B1498

ROM or RAM

• When the ROM or RAM are abnormal

B1547

Passenger’s air bag cut off activating 
circuit (squib ignition drive circuit)

• Cut OFF (squib ignition drive circuit)

B1557

Application specific integrated circuit

• When the application specific integrated circuit are 

abnormal

B1588

Backup capacitor system

Backup capacitor up converter

B1589

Backup capacitor down converter

B1590

Backup capacitor capacitance big

B1591

Backup capacitor capacitance small

B1607

Seat belt pre-tensioner (driver side) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1608

• Open circuit in the squib ignition drive circuit

B1613

Seat belt pre-tensioner (passenger 
side) (squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1614

• Open circuit in the squib ignition drive circuit

B1635

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

• Short circuit in the squib ignition drive circuit

B1636

• Open circuit in the squib ignition drive circuit

Code No. Part/Circuit integral to SRS-ECU

Trouble causes

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-28

Code No.B1406 Malfunction of G-sensor inside right front impact sensor

 

Code No.B1416 Malfunction of G-sensor inside left front impact sensor

CAUTION

If the diagnosis code B1406 or B1416 is set to 
SRS-ECU, be sure to diagnose the CAN bus line.

TROUBLE JUDGEMENT

• Analogue G-sensor in front impact sensor does 

not operate.

• Characteristics of analogue G-sensor in front 

impact sensor are abnormal.

• Output of analogue G-sensor in front impact sen-

sor is abnormal.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of right front impact sensor (with 

code No. B1406)

• Malfunction of left front impact sensor (with code 

No. B1416)

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. Front impact sensor check.
(1) Check that the negative battery terminal is 

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

(2) A front impact sensor is checked in the following 

way.

• Replace the front impact sensor with new 

part.

(3) Connect the negative battery terminal.
(4) After erasing the diagnosis code memory, check 

the diagnosis code again.

(5) Disconnect the negative battery terminal.

Q: Is the diagnosis code set?

YES : 

Go to Step 3

NO : 

The procedure is complete.

STEP 3. SRS-ECU check.
(1) Check that the negative battery terminal is 

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

(2) Replace the SRS-ECU with a new one (Refer to 

P.52B-129

). 

(3) Connect the negative battery terminal.
(4) After erasing the diagnosis code memory, check 

the diagnosis code again.

(5) Disconnect the negative battery terminal.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No.B1407: Front impact sensor (RH) voltage error

CAUTION

If diagnosis code B1407 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

OPERATION

The front impact sensor transmits acceleration data 
to the SRS-ECU. The SRS-ECU then determines 
whether to operate the front air bags, and then out-
puts an ignition signal when necessary. The front 
impact sensor also diagnoses itself, and sends a 
diagnosis code to the SRS-ECU if a malfunction 
occurs.

DIAGNOSIS CODE SET CONDITIONS

This diagnosis code will set when the power supply 
voltage to the front impact sensor (RH) remains less 
than a predetermined value for one second.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the front impact sensor (RH)

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-29

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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, Diagnosis ).

STEP 2. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: "LOCK" (OFF) position to "ON"
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the diagnosis code set?

YES : 

Go to Step 3.

NO : 

There is an intermittent malfunction such as 
poor engaged connector(s) or open circuit 
(Refer to GROUP 00, How to Cope with 
Intermittent Malfunction ).

STEP 3.  Check of short to power supply, short to 
earth, and open circuit in FRH-, FRH+ line 
between SRS-ECU connector and front impact 
sensor (RH) connector.

NOTE: After inspecting intermediate connector 
inspect the wiring harness. If the intermediate con-
nector is damaged, repair or replace it.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Check the front impact sensor (RH).
(1) Disconnect the negative battery terminal.
(2) Alternate the front impact sensor (RH) and the 

front impact sensor (LH), and then install the 
alternated sensor.

(3) Connect the negative battery terminal.
(4) Erase diagnosis code from memory, and check 

the diagnosis code.

Q: Is diagnosis code B1417 set?

YES : 

Replace the front impact sensor (RH) with a 

new one (Refer to 

P.52B-125

). 

NO : 

Go to Step 5.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1407 set?

YES : 

Replace the SRS-ECU (Refer to 

P.52B-129

).

NO : 

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

Code No.B1408: Front impact sensor (RH) communication error

 

Code No.B1409: Front impact sensor (RH) communication impossible

CAUTION

If diagnosis code No. B1408 or B1409 is set in the 
SRS-ECU, always diagnose the CAN main bus 
line.

OPERATION

The front impact sensor transmits acceleration data 
to the SRS-ECU. The SRS-ECU then determines 
whether to operate the front air bags, and then out-
puts an ignition signal when necessary. The front 
impact sensor also diagnoses itself, and sends a 
diagnosis code to the SRS-ECU if a malfunction 
occurs

DIAGNOSIS CODE SET CONDITIONS

The diagnosis code is set if the communication 
between the right front impact sensor and SRS-ECU 
is abnormal (No. B1408), or impossible (No. B1409).

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the front impact sensor (RH)

• Malfunction of the 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?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-30

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. B1408 or B1409 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. Check the front impact sensor (RH) .
(1) Check that the negative battery terminal is 

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

(2) Alternate the front impact sensor (RH) and front 

impact sensor (LH), and then install the 
alternated sensors.

(3) Connect the negative battery terminal.
(4) After erasing the diagnosis code memory, check 

the diagnosis code again.

(5) Disconnect the negative battery terminal.

Q: Is the diagnosis code No. B1408 or B1409 set?

YES : 

Replace the front impact sensor (RH) (Refer 

to 

P.52B-125

).

NO : 

Go to Step 4

STEP 4.Check of short to power supply, short to 
earth, and open circuit in FRH-, FRH+ line 
between SRS-ECU connector and front impact 
sensor (RH) connector.

NOTE: After inspecting intermediate connector 
inspect the wiring harness. If the intermediate con-
nector is damaged, repair or replace it.

Q: Is the check result normal?

YES : 

Go to Step 5

NO : 

Repair the wiring harness.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1408 or B1409 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.B1410 Passenger's (front) air bag module (squib) system (short circuit between squib circuit 
terminals)

CAUTION

• If the diagnosis code B1410 is set to 

SRS-ECU, be sure to diagnose the CAN bus 
line.

• Follow the diagnosis procedure below. If diag-

nosis code B1410 is set, check squib side cir-
cuit.

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 
in SRS-ECU, the electric current is supplied from 
SRS-ECU to the passenger's (front) air bag module 
(squib).

TROUBLE JUDGEMENT

The code is set when the short circuit occurs to 
between the terminals of SRS-ECU passenger's 
(front) air bag module (squib) circuit.

PROBABLE CAUSES

• Damaged short spring 

*

• Short circuit between terminals of passenger's 

(front) air bag module (squib) circuit

• Damaged connector(s)

• Malfunction of SRS-ECU

NOTE:  *: The squib circuit connectors integrate a 
short spring (which prevents the air bags from being 
unintentionally deployed because of static electricity 
by shorting the positive wire to the earth wire in the 
squib circuit when the connectors are disconnected). 
Therefore, when the above codes are set, the short 
spring may not be released due to the damaged con-
nector even when the connectors are connected.

 

 

 

 

 

 

 

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