Mitsubishi Outlander (2013+). Manual - part 607

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-79

wiring harness side connectors. 

• Continuity GND2 line between SRS-ECU wir-

ing harness side connector and body earth

OK: Continuity (less than 2 

Ω)

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness GND2 line 
between the SRS-ECU connector and the 
earth.

STEP 7. 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 
lever, and disconnect the SRS-ECU connector.

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

harness side connector. 

• Voltage between terminal IG1A line and body 

earth

OK: 9 V or more

(6) Disconnect the negative battery terminal.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Go to Step 8.

STEP 8. Resistance measurement at the 
SRS-ECU connector.
(1) Check that the negative battery terminal is 

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

(2) Disconnect the ETACS-ECU connector.

AC905015

A

AC

Lock lever

(3) 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 
lever, and disconnect the SRS-ECU connector.

• Continuity IG1A line between ETACS-ECU 

connector and SRS-ECU connector

OK: Continuity (less than 2 

Ω)

Q: Is the check result normal?

YES : 

Replace the ETACS-ECU (Refer to GROUP 

54A 

− ETACS-ECU ).

NO : 

Repair the wiring harness IG1A line 
between the ETACS-ECU connector and 
the SRS-ECU connector.

STEP 9. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code No. B1476 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. B1488 Passenger's air bag OFF indicator lamp (short circuited)

CAUTION

If the diagnosis code B1488 is set in the 
SRS-ECU, be sure to diagnose the CAN bus line

OPERATION

• Power for the passenger’s air bag OFF indicator 

lamp is supplied from the fusible link (2).

• The passenger’s air bag OFF indicator lamp illu-

minates when the ignition switch is turned to the 
"ON" position and goes out after approximately 6 
to 8 seconds if there is not a malfunction in the 
SRS system.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-80

TROUBLE JUDGEMENT

This code will be set if the passenger’s air bag OFF 
indicator lamp driving circuit is short to earth.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

• Malfunction of the passenger’s air bag OFF indi-

cator lamp

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. B1488 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 passenger’s air bag OFF 
indicator lamp.
It is checked whether passenger’s air bag OFF indi-
cator lamp is normal (Refer to 

P.52B-152

).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace hazard indicator assembly (Refer 
to GROUP 52A 

− Instrument Panel 

Assembly ).

STEP 4. Resistance 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 
lever, and disconnect the SRS-ECU connector.

(3) Disconnect the hazard indicator assembly 

connector.

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

connector. 

• Continuity between OFLP line and body earth

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harnesses OFLP line 
between the SRS-ECU connector and the 
hazard indicator assembly connector.

STEP 5. Resistance measurement at the hazard 
indicator assembly 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 
lever, and disconnect the SRS-ECU connector.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(3) Take the following measurements at the backside 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-81

of the hazard indicator assembly side connector 
(harness side). 

• Continuity between LP line and body earth

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Repair the wiring harnesses LP line 
between the hazard indicator assembly 
connector and the body earth.

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1488 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. B1489 Passenger’s air bag OFF indicator lamp (open circuit)

CAUTION

If the diagnosis code B1489 is set in the 
SRS-ECU, be sure to diagnose the CAN bus line

OPERATION

• Power for the passenger’s air bag OFF indicator 

lamp is supplied from the fusible link (2).

• The passenger’s air bag OFF indicator lamp illu-

minates when the ignition switch is turned to the 
"ON" position and goes out after approximately 6 
to 8 seconds if there is not a malfunction in the 
SRS system.

TROUBLE JUDGEMENT

This code will be set if an open circuit has occurred 
in the wiring harness between the passenger’s air 
bag OFF indicator lamp and the SRS-ECU.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

• Malfunction of the passenger’s air bag OFF indi-

cator lamp

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. B1489 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 passenger’s air bag OFF 
indicator lamp.
It is checked whether passenger’s air bag OFF indi-
cator lamp is normal (Refer to 

P.52B-152

).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace hazard indicator assembly (Refer 
to GROUP 52A 

− Instrument Panel 

Assembly ).

STEP 4. Resistance measurement at the 
SRS-ECU connector and the hazard indicator 
assembly 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 
lever, and disconnect the SRS-ECU connector.

(3) Disconnect the hazard indicator assembly 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-82

connector.

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

and hazard indicator assembly wiring harness 
side connectors. 

• Continuity OFLP line between SRS-ECU con-

nector and hazard indicator assembly con-
nector

OK: Continuity (less than 2 

Ω)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harnesses OFLP line 
between the SRS-ECU connector and the 
hazard indicator assembly connector.

STEP 5. Measure the voltage at the hazard 
indicator assembly connector.
(1) Disconnect the hazard indicator assembly 

connector.

(2) Connect the negative battery terminal.
(3) Ignition switch: ON

(4) Measure the voltage between the hazard 

indicator assembly harness side connector and 
the body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness IG+ line between 
the ETACS-ECU connector and the hazard 
indicator assembly connector.

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is the diagnosis code No. B1489 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. B1499: Air bag deployment determined by SRS-ECU

CAUTION

If diagnosis code B1499 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

TROUBLE JUDGMENT

This diagnosis code is set after the air bag has 
deployed. If this diagnosis code is set before the air 
bag has deployed, the cause is probably a malfunc-
tion inside the SRS-ECU.

PROBABLE CAUSES

Malfunction of the SRS-ECU

Code No. B1570: Passenger's air bag cut off switch malfunction 

 

Code No. B1573: Passenger's air bag cut off switch circuit (power supply side) shorted

 

Code No. B1574: Passenger's air bag cut off switch circuit open

 

Code No. B1575: Passenger's air bag cut off switch circuit (earth side) shorted 

CAUTION

If diagnosis code B1570, B1573, B1574 or B1575 
are set in the SRS-ECU, always diagnose the 
CAN bus lines.

OPERATION

According to the passenger’s air bag cut off switch 
connecting position, the SRS-ECU judges the 
deployment and non-deployment of passenger’s 
(front) air bag.

DIAGNOSIS CODE SET CONDITIONS

Diagnosis code is set when the resistance between 
input terminals of the passenger’s air bag cut off 
switch is without the standard value.
Cause of trouble in each diagnosis code is as fol-
lows.

Code No.

Symptom

B1570

Malfunction of passenger’s air bag 
cut off switch 

B1573

Short to the power supply in the 
common terminal harness