Mitsubishi Lancer (4A9 engine). Manual — part 143
REVERSING SENSOR SYSTEM
CHASSIS ELECTRICAL
54A-234
TROUBLE SYMPTOM CHART
M1547001501133
Trouble symptom
Inspection
procedure
number
Reference
page
The reversing sensor system does not operate.
1
The reversing sensor indicator does not illuminate.
2
The system cannot be activated or deactivated even when the sonar switch is
pressed.
3
One or more of the reversing sensor (corner sensor/back sensor) does not
detect the obstacle.
4
The reversing sensor indicator keeps flashing.
5
Obstacle is not detected even when the selector or shift lever is shifted to "R"
(Reverse) position.
6
REVERSING SENSOR SYSTEM
CHASSIS ELECTRICAL
54A-235
SYMPTOM PROCEDURES
Inspection Procedure 1: The reversing sensor system does not operate.
CAUTION
• Whenever the ECU is replaced, ensure that the input signal circuit is 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 ultrasonic noise stops, the normal operation will be resumed immediately.)
Reversing Sensor System Power Source Circuit
ETACS-ECU
POWER
SOURCE
CORNER SENSOR/
BACK SENSOR-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
AC612705
Connector: C-40
DQ
C-40 (B)
ACA00886
AL
Connector: C-317
ETACS-ECU
REVERSING SENSOR SYSTEM
CHASSIS ELECTRICAL
54A-236
COMMENTS ON TROUBLE SYMPTOM
If the Reversing sensor system does not work at all
even when the ignition switch is turned "ON", the
power supply system, corner sensor/back sensor-
ECU or ETACS-ECU may have a problem.
PROBABLE CAUSES
• Malfunction of corner sensor/back sensor-ECU
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-40 corner sensor/
back sensor-ECU connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Voltage measurement at the C-40 corner
sensor/back sensor-ECU connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the C-40 corner
sensor/back sensor-ECU connector (terminal No.
13) and the body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 3.
STEP 3. Connector check: C-317 ETACS-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the defective connector.
STEP 4. Wiring harness check between the C-317
ETACS-ECU connector (terminal No. 5) and the
C-40 corner sensor/back sensor-ECU connector
(terminal No. 13)
• Check the power supply line for open circuit or
short circuit.
NOTE: Before the wiring harness inspection, inspect
joint connector C-150, and repair if necessary.
Q: Is the check result normal?
YES :
Troubleshoot the ETACS-ECU. Refer to
Inspection Procedure 2 "The ignition switch
(IG1) signal is not received" .
NO :
Repair the wiring harness.
STEP 5. Resistance measurement at the C-40
corner sensor/back sensor-ECU connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the C-40 corner
sensor/back sensor-ECU connector (terminal No.
24) and the body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
STEP 6. Wiring harness check between the C-40
corner sensor/back sensor-ECU connector
(terminal No. 24) and the body earth
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
Retest the system.
NO :
Repair the wiring harness.
STEP 7. 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.
REVERSING SENSOR SYSTEM
CHASSIS ELECTRICAL
54A-237
Inspection Procedure 2: The reversing sensor indicator does not illuminate.
CAUTION
• Whenever the ECU is replaced, ensure that the input signal circuit is 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 ultrasonic noise stops, the normal operation will be resumed immediately.)
Sonar Switch Indicator Circuit
CORNER SENSOR/
BACK SENSOR-ECU
SONAR SWITCH
ETACS-ECU
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
AC612705
Connector: C-40
DQ
C-40 (B)
AC801266
AJ
Connector: C-43
C-43 (L)
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