Mitsubishi Outlander (2013+). Manual - part 599

 

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Mitsubishi Outlander (2013+). Manual - part 599

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-47

• side-airbag 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. B1423 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 
connected, disconnect it.

AC706606

AC

Locking button

Side-airbag module
connector

(2) Disconnect the right side-airbag module 

connector, unlock the connector by sliding the 
locking button to the direction of the arrow as 
shown in the figure, and then disconnect the 

connector.

AC507310BS

Side-airbag 
module (RH) connector

Harness 
side 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 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 

right side-airbag module harness side connector.

(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. B1423 set?

YES : 

Go to Step 4.

NO : 

Replace the front seatback pad and frame 
assembly (Refer to 

P.52B-142

).

STEP 4. 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-48

lever, and disconnect the SRS-ECU connector.

DANGER

To release the connector short spring in the 
following operations, disconnect this 
side-airbag module connector, and keep the 
squib circuit shorted.

AC706606

AC

Locking button

Side-airbag module
connector

(3) Disconnect the right side-airbag module 

connector, unlock the connector by sliding the 
locking button to the direction of the arrow as 
shown in the figure, and then disconnect the 
connector.

AC905468AR

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, thus insert for 4 mm or 
more.
(4) Insert a cable tie (width: 3 mm, thickness: 0.5 

mm) between the SRS+, SRS- line and the short 
spring, 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 SRS+, SRS- 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 5.

NO : 

Repair the wiring harness SRS+, SRS- line 
between the SRS-ECU connector and the 
right side-airbag module connector.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1423 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.B1426 Malfunction of G-sensor inside right side impact sensor 

 

Code No.B1436 Malfunction of G-sensor inside left side impact sensor

CAUTION

If the diagnosis code B1426 or B1436 is set to 
SRS-ECU, be sure to diagnose the CAN bus line.

TROUBLE JUDGEMENT

• Analogue G-sensor for side impact does not 

operate.

• Characteristics of analogue G-sensor for side 

impact are abnormal.

• Output of analogue G-sensor for side impact is 

abnormal.

PROBABLE CAUSES

• Malfunction of right side impact sensor (with code 

No. B1426)

• Malfunction of left side impact sensor (with code 

No. B1436)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-49

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

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

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

way.

• Replace the right side impact sensor {In case 

of code B1426 (Regardless of "Active" or 
"Stored" faults)} with the new part.

• Replace the left side impact sensor {In case 

of code B1436 (Regardless of "Active" or 
"Stored" faults)} with the 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 No. B1426 or B1436 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 No. B1426 or B1436 set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No.B1427: Side impact sensor (RH) voltage error

CAUTION

If diagnosis code B1427 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

OPERATION

The side impact sensor transmits acceleration data 
to the SRS-ECU. The SRS-ECU then determines. if 
the side and/or curtain air bags should be inflated, 
and then sends an ignition signal. The side impact 
sensor also diagnoses itself, and sends a diagnosis 
code to the SRS-ECU if a problem occurs.

DIAGNOSIS CODE SET CONDITIONS

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

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the side impact sensor (RH)

• Malfunction of the SRS-ECU

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 B1427 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 ).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-50

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

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connectors or harness wires.

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

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

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

check the diagnosis code.

Q: Is diagnosis code B1427 set?

YES : 

Replace the side impact sensor (RH) with a 

new one (Refer to 

P.52B-127

).

NO : 

Go to Step 5.

STEP 5. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1427 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.B1428: Side impact sensor (RH) communication error

 

Code No.B1429: Side impact sensor (RH) communication impossible

CAUTION

If diagnosis code B1428 or B1429 is set in the 
SRS-ECU, always diagnose the CAN main bus 
line.

OPERATION

If an impact of set value or more is detected, the side 
impact sensor sends the coded acceleration data to 
SRS-ECU. Based on the acceleration data, 
SRS-ECU determines the necessity of side-airbag 
and curtain air bag deployment, and then turns ON 
the power supply circuit to the inflator.

TROUBLE JUDGEMENT

The diagnosis code is set if the communication 
between the right side impact sensor and SRS-ECU 
is abnormal (No. B1428), or impossible (No. B1429).

PROBABLE CAUSES

• Malfunction of right side impact sensor

• Damaged wiring harness and connectors

• 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 B1428 or B1429 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. Right side impact sensor check.
(1) Check that the negative battery terminal is 

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

(2) Alternate the right side impact sensor and left 

side impact sensor, 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. B1428 or B1429 set?

YES : 

Replace the right side impact sensor (Refer 

to 

P.52B-127

).

NO : 

Go to Step 4

 

 

 

 

 

 

 

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