Mitsubishi Outlander (2013+). Manual - part 675

REVERSING SENSOR (CORNER SENSOR AND BACK SENSOR)

CHASSIS ELECTRICAL

54A-185

STEP 3. Resistance measurement at corner 
sensor/back sensor-ECU connector (PGND 
terminal).
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the corner 

sensor/back sensor-ECU connector (PGND 
terminal) and body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check of open circuit in PGND line 
between corner sensor/back sensor-ECU 
connector and body earth.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the connector(s) or wiring harness.

STEP 5. Replace the corner sensor/back 
sensor-ECU temporarily, and then check the 
trouble symptom.
Replace the corner sensor/back sensor-ECU tempo-
rarily, then check if the corner sensors operate.

Q: Is the check result normal?

YES : 

Replace the corner sensor/back 

sensor-ECU.

NO : 

Replace the ETACS-ECU.

Inspection Procedure 2: The reversing sensor indicator does not illuminate.

CAUTION

• Before replacing the ECU or sensor, ensure 

that the power supply circuit, the earth circuit 
and the communication circuit are normal.

• When the illuminated licence plate is 

installed, the sensors may not operate 
because of noise from the plate. (When the 
ultrasonic noise is received, the bass toned 
buzzer sound continuously. When the ultra-
sonic noise stops, the normal operation will 
be resumed immediately.)

COMMENTS ON TROUBLE SYMPTOM

If the reversing indicator does not illuminate, the wir-
ing harness, connectors, corner sensor/back sen-
sor-ECU, or ETACS-ECU may be defective.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of corner sensor/back sensor-ECU

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Sonar switch check
Check the indicator. (Refer to 

P.54A-193

)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the sonar switch.

STEP 2. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the 
ETACS-ECU.

Q: Is the check result normal?

YES : 

Troubleshoot the ETACS-ECU (Refer to 

GROUP 54A 

− ETACS − Diagnosis Code 

Chart 

P.54A-281

.

NO : 

Go to Step 3.

STEP 3. Voltage measurement at sonar switch 
connector (power supply terminal)
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Check the voltage between the sonar switch 

connector (power supply terminal) and body 
earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check of short to power supply, short to 
earth, and open circuit in IG1 line between 
ETACS-ECU connector and sonar switch 
connector.

Q: Is the check result normal?

REVERSING SENSOR (CORNER SENSOR AND BACK SENSOR)

CHASSIS ELECTRICAL

54A-186

YES : 

Troubleshoot the ETACS-ECU. Refer to 

GROUP 54A 

− ETACS − Inspection 

Procedure 2 "The ignition switch (IG1) 
signal is not received" 

P.54A-313

.

NO : 

Repair the connector(s) or wiring harness.

STEP 5. Check of short to power supply, short to 
earth, and open circuit in ING line between 
corner sensor/back sensor-ECU connector and 
sonar switch connector.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the connector(s) or wiring harness.

STEP 6. Retest the system

Q: Is the check result normal?

YES : 

The diagnosis is complete.

NO : 

Replace the corner sensor/back 
sensor-ECU.

Inspection Procedure 3: The system cannot be activated or deactivated even when the sonar switch 
is pressed.

CAUTION

• Before replacing the ECU or sensor, ensure 

that the power supply circuit, the earth circuit 
and the communication circuit are normal.

• When the illuminated licence plate is 

installed, the sensors may not operate 
because of noise from the plate. (When the 
ultrasonic noise is received, the bass toned 
buzzer sound continuously. When the ultra-
sonic noise stops, the normal operation will 
be resumed immediately.)

COMMENTS ON TROUBLE SYMPTOM

If the reversing sensor system ON/OFF cannot be 
switched even when the sonar switch is pressed, the 
harness, connector(s), sonar switch, or corner sen-
sor/back sensor-ECU may have a problem.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of sonar switch

• Malfunction of corner sensor/back sensor-ECU

DIAGNOSIS PROCEDURE

STEP 1. sonar switch check
Inspect the corner sensor switch for normal opera-
tion. (Refer to 

P.54A-193

)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the sonar switch.

STEP 2. Resistance measurement at sonar 
switch connector (earth terminal)
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the sonar switch 

connector (earth terminal) and body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

STEP 3. Check of open circuit in earth line sonar 
switch connector and the body earth

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the connector(s) or wiring harness.

STEP 4. Check of short to power supply, short to 
earth, and open circuit in SW line between sonar 
switch connector and corner sensor/back 
sensor-ECU connector

Q: Is the check result normal?

YES : 

Replace the corner sensor/back 

sensor-ECU.

NO : 

Repair the connector(s) or wiring harness.

REVERSING SENSOR (CORNER SENSOR AND BACK SENSOR)

CHASSIS ELECTRICAL

54A-187

Inspection Procedure 4: One or more of the reversing sensor (corner sensor/back sensor) does not 
detect the obstacle.

 

Inspection Procedure 5: The reversing sensor indicator keeps flashing.

CAUTION

• Before replacing the ECU or sensor, ensure 

that the power supply circuit, the earth circuit 
and the communication circuit are normal.

• When the illuminated licence plate is 

installed, the sensors may not operate 
because of noise from the plate. (When the 
ultrasonic noise is received, the bass toned 
buzzer sound continuously. When the ultra-
sonic noise stops, the normal operation will 
be resumed immediately.)

COMMENTS ON TROUBLE SYMPTOM

If one or more of the reversing sensors (corner sen-
sor/back sensor) cannot detect obstacles, the wires 
and connectors, reversing sensors (corner sen-
sor/back sensor), or the corner sensor/back sen-
sor-ECU may have abnormalities. Also, if one or 
more of the sensors has an abnormality (open circuit, 
malfunction, etc.), the corner sensor/back sen-
sor-ECU informs the abnormality by making the 
reversing sensor indicator flash.

NOTE: 

.

•

If the corner sensor/back sensor-ECU detects an 
abnormality (open circuit, malfunction, etc.) with 
one or more of the sensors, it turns off the rele-
vant sensor and sounds the high toned buzzer for 
5 seconds. The reversing sensor indicator illumi-
nates while the system is being operated until the 
relevant sensor returns to normal.

•

If ultrasonic noise is received with one or more of 
the sensor, the corner sensor/back sensor-ECU 
sounds the low toned buzzer continuously. When 
the ultrasonic noise is stopped, the sensor 
returns to normal. (The reversing sensor indicator 
does not flash.)

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of reversing sensor (corner sen-

sor/back sensor)

• Malfunction of corner sensor/back sensor-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the reversing sensor (corner 
sensor/back sensor) for interference.

Q: Are there anything that interferes with the 

communication (things that generate radio waves 
such as magnets and an air-cleaning device that 
has a power plug) near the reversing sensor 
(corner sensor/back sensor)?
YES : 

Move away or remove things that interfere 

with the communication (things that 
generate radio waves such as magnets and 
a air-cleaning device that has a power plug) 
near the reversing sensor (corner 
sensor/back sensor).

NO : 

Go to Step 2

STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the reversing sen-
sor (corner sensor/back sensor).

Q: Is the diagnosis code set?

YES : 

Refer to 

P.54A-179

.

NO : 

Go to Step 3.

STEP 3. Trouble symptom recheck

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the corner sensor/back 
sensor-ECU.

REVERSING SENSOR (CORNER SENSOR AND BACK SENSOR)

CHASSIS ELECTRICAL

54A-188

Inspection Procedure 6: Obstacle is not detected even when the selector lever is shifted to "R" 
(Reverse) position.

CAUTION

• Before replacing the ECU or sensor, ensure 

that the power supply circuit, the earth circuit 
and the communication circuit are normal.

• When the illuminated licence plate is 

installed, the sensors may not operate 
because of noise from the plate. (When the 
ultrasonic noise is received, the bass toned 
buzzer sound continuously. When the ultra-
sonic noise stops, the normal operation will 
be resumed immediately.)

COMMENTS ON TROUBLE SYMPTOM

If obstacle is not detected even when the selector 
lever is shifted to "R" (reverse) position, the wiring 
harness, connectors, inhibitor switch, or corner sen-
sor/back sensor-ECU may be defective. In addition, 
obstacle is not detected when the ultrasonic noise is 
received.

NOTE: If ultrasonic noise is received with the sensor, 
the corner sensor/bock sensor sounds the low toned 
buzzer continuously and turns off the system. When 
the ultrasonic noise is stopped, the sensor returns to 
normal.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the inhibitor switch

• Malfunction of corner sensor/back sensor-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 

− Troubleshooting − CAN Bus 

Diagnosis Chart ).

STEP 2. M.U.T.-III other system diagnosis code
Check if the diagnosis code is set to the 
ETACS-ECU.

Q: Is the check result normal?

YES : 

Troubleshoot the ETACS-ECU (Refer to 

GROUP 54A 

− ETACS − Diagnosis Code 

Chart 

P.54A-281

).

NO : 

Go to Step 3

STEP 3. Check the reversing sensor (corner 
sensor/back sensor) for interference.

Q: Is there anything that interferes with the 

communication (things that generate radio waves 
such as magnets and an air-cleaning device that 
has a power plug) near the reversing sensor 
(corner sensor/back sensor)?
YES : 

Move away or remove things that interfere 

with the communication (things that 
generate radio waves such as magnets and 
a air-cleaning device that has a power plug) 
near the reversing sensor (corner 
sensor/back sensor).

NO : 

Go to Step 4

STEP 4. Voltage measurement at ETACS-ECU 
connector (BLP1 terminal).
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Turn the ignition switch to the "ON" position, and 

move the selector lever to the "R" position.

(3) Check the voltage between the ETACS-ECU 

connector (BLP1 terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10

NO : 

Go to Step 5

STEP 5. Check of short to power supply, short to 
earth, and open circuit in BLP1 line between 
ETACS-ECU connector and inhibitor switch 
connector.

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Repair the connector(s) or wiring harness.

STEP 6. Voltage measurement at inhibitor switch 
connector (power supply terminal).
(1) Disconnect B-109 inhibitor switch connector, and 

measure at the wiring harness side.

(2) Turn the ignition switch to "ON" position.
(3) Check the voltage between the inhibitor switch 

connector (power supply terminal) and body 
earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 9

NO : 

Go to Step 7