PARKING SENSOR SYSTEM DOES NOT OPERATE [PARKING SENSOR SYSTEM]

id0903n7200300

Note
•  If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [PARKING SENSOR SYSTEM] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [PARKING SENSOR SYSTEM].)

Description

•  Even if the parking sensor switch is turned on, the parking sensor buzzer is not activated or the parking sensor indicator is not turned on.

Possible Causes

•  Indicator unit connector or terminal malfunction
•  Parking assist unit connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Indicator unit terminal H—Parking assist unit terminal S
―  Indicator unit terminal I—Parking assist unit terminal V
•  Open circuit in wiring harness between the following terminals:
―  Indicator unit terminal H—Parking assist unit terminal S
―  Indicator unit terminal I—Parking assist unit terminal V
•  Indicator unit malfunction
―  Parking sensor switch/indicator malfunction
•  Parking assist unit malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action
1
VERIFY ALL SYSTEM DTCs
•  Switch the ignition off.
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Perform a CMDTC self-test using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PARKING ASSIST UNIT].)
No
Go to the next step.
2
VERIFY MALFUNCTION SYMPTOM
•  Switch the ignition ON (engine off or on).
•  Turn the parking sensor switch on.
•  Does the parking sensor indicator turn on and is the buzzer activated?
Yes
If buzzer is activated after turning the indicator on:
•  System is normal.
If buzzer is not activated:
•  Perform an inspection referring to "PARKING SENSOR BUZZER DOES NOT ACTIVATE/BUZZER SOUND IS SMALL".
If indicator does not turn on:
•  Perform an inspection referring to "PARKING SENSOR INDICATOR DOES NOT TURN ON".
No
Go to the next step.
3
INSPECT INDICATOR UNIT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the indicator unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
4
INSPECT PARKING ASSIST UNIT CONNECTOR CONDITION
•  Disconnect the parking assist unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector.
5
INSPECT PARKING SENSOR SWITCH/INDICATOR CIRCUIT FOR SHORT TO GROUND
•  Verify that the indicator unit and parking assist unit connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Indicator unit terminal H
―  Indicator unit terminal I
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Indicator unit terminal H—Parking assist unit terminal S
•  Indicator unit terminal I—Parking assist unit terminal V
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
No
Go to the next step.
6
INSPECT PARKING SENSOR SWITCH/INDICATOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the indicator unit and parking assist unit connectors are disconnected.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Indicator unit terminal H
―  Indicator unit terminal I
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Indicator unit terminal H—Parking assist unit terminal S
•  Indicator unit terminal I—Parking assist unit terminal V
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
7
INSPECT PARKING SENSOR SWITCH/INDICATOR CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Verify that the indicator unit and parking assist unit connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Indicator unit terminal H—Parking assist unit terminal S
―  Indicator unit terminal I—Parking assist unit terminal V
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Indicator unit terminal H—Parking assist unit terminal S
•  Indicator unit terminal I—Parking assist unit terminal V
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
8
INSPECT PARKING SENSOR SWITCH/INDICATOR
•  Inspect the parking sensor switch/indicator.
•  Is the parking sensor switch/indicator normal?
Yes
Replace the parking assist unit.
(See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
No
Replace the indicator unit.
(See INDICATOR UNIT REMOVAL/INSTALLATION.)