No.4 CANNOT DETECT OBSTRUCTION [PARKING SENSOR]

id0903z4886600

4
Cannot detect obstruction
DESCRIPTION
•  Does not detect even though obstruction is within the detection area with the detections conditions satisfied.
POSSIBLE CAUSES
•  R position (ATX), reverse (MTX) signal malfunction.
―  Open or short circuit in wiring harness between TR switch (ATX)/back-up light switch (MTX) and parking sensor control module
―  Open or short circuit in wiring harness between TR switch (ATX)/back-up light switch (MTX) and BCM
―  Open or short circuit in wiring harness between TR switch (ATX)/back-up light switch (MTX) and back-up light
―  TR switch malfunction (ATX).
―  Reverse switch malfunction (MTX).
•  Vehicle speed signal malfunction.
―  Open circuit in wiring harness between instrument cluster terminal 2O and parking sensor control module terminal Y.
―  Short to power supply or ground in wiring harness between instrument cluster terminal 2O and parking sensor control module terminal Y.
―  Instrument cluster malfunction.
―  Vehicle speed signal output to instrument cluster malfunction.
•  Tow-bar switch, trailer switch signal malfunction.
―  Short circuit (tow-bar switch) to ground in parking sensor control module terminal AF.
―  Short (trailer switch) to ground in parking sensor control module terminal AD.
•  Parking sensor control module malfunction.

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY MALFUNCTION SYMPTOM
•  Set up the vehicle according to the following conditions:
―  Switch the ignition to ON.
―  Release the parking brake.
―  R position (ATX)
―  Reverse gear (MTX)
―  Vehicle is stopped.
―  Turn the parking sensor switch on.
•  Put an object (obstruction) close to each sensor.
•  Does the buzzer for each sensor activate (detects obstruction)?
Yes
System is normal.
(Explain the effects of noise using the troubleshooting section of the owner's manual)
No
Go to the next step.
2
VERIFY IF AFTER-MARKET ELECTRONIC DEVICES ARE INSTALLED
•  Has an after-market electronic device been installed?
Yes
Go to the next step.
No
Go to Step 4.
3
DETERMINE IF MALFUNCTION CAUSE IS INSTALLATION OF AFTER-MARKET ELECTRONIC DEVICE
•  Remove the after-market electrical product.
•  Repeat the inspection from Step 1.
•  Does the buzzer for each sensor activate (detects obstruction)?
Yes
Explain to the customer that the installation of after-market electronic devices can cause noise.
No
Go to the next step.
4
VERIFY MALFUNCTION CONDITION
•  Verify the malfunction conditions in Step 1.
 
Corner/back sensors detects all obstructions correctly:
•  Go to Step 9.
One sensor or a few sensors do not detect obstructions correctly:
•  Inspect the wiring harness of the applicable sensor and repair or replace the malfunctioning location.
5
DETERMINE IF MALFUNCTION CAUSE IS R POSITION (ATX), REVERSE (MTX) SIGNAL
•  Switch the ignition to ON.
•  Turn on the parking sensor switch.
•  Measure the voltage of parking sensor control module terminal W.
•  Is the voltage normal?
Yes
Go to Step 7.
No
Go to the next step.
6
INSPECT REVERSE SIGNAL
•  Inspect the TR switch (ATX)/back-up light switch (MTX).
•  Is the TR switch (ATX)/back-up light switch (MTX) normal?
Yes
Inspect and repair for open or short circuit at followings:
•  Between TR switch (ATX)/back-up light switch (MTX) and parking sensor control module terminal W
•  Between TR switch (ATX)/back-up light switch (MTX) and BCM
•  Between TR switch (ATX)/back-up light switch (MTX) and back-up light
If the wiring harnesses are normal, replace the parking sensor control module.
No
Replace the back-up light switch (MTX)/Transaxle range switch (ATX).
(See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [FS5A-EL].)
(See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [F35M-R].)
(See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [J65M-R].)
(See BACK-UP LIGHT SWITCH REMOVAL/INSTALLATION [A26M-R].)
7
VERIFY IF MALFUNCTION CAUSE IS SHORT TO GROUND IN TOW-BAR SWITCH, TRAILER SWITCH SIGNAL
•  Switch the ignition to ON.
•  Turn on the parking sensor switch.
•  Measure the voltage of parking sensor control module terminal AF and terminal AD.
•  Is the voltage 1.0 V or more?
Yes
Repair for a short to ground in the wiring harness of parking sensor control module terminal AF and terminal AD.
No
Replace the parking sensor control module.
(See PARKING SENSOR CONTROL MODULE REMOVAL/INSTALLATION.)
8
VERIFY IF MALFUNCTION CAUSE IS VEHICLE SPEED SIGNAL CIRCUIT WIRING HARNESS
•  Switch the ignition to ON.
•  Turn on the parking sensor switch.
•  Measure the voltage of parking sensor control module terminal Y.
•  Is the voltage normal?
Yes
Replace the parking sensor control module.
(See PARKING SENSOR CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
9
DETERMINE IF MALFUNCTION CAUSE IS SPEEDOMETER RELATED
•  Verify the speedometer display.
•  Does the speedometer indicate the actual vehicle speed?
Yes
Repair for an open circuit, short to the wiring harness between parking sensor control module terminal Y and instrument cluster terminal 2O.
No
Go to the instrument cluster symptom troubleshooting procedure “NO. 8 SPEEDOMETER INDICATION IS DEFECTIVE [INSTRUMENT CLUSTER]”.