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 signal malfunction. ― Open or short circuit in wiring harness between TR switch and parking sensor control module ― Open or short circuit in wiring harness between TR switch and BCM ― Open or short circuit in wiring harness between TR switch and back-up light ― TR switch malfunction • Vehicle speed signal malfunction. ― Open circuit in wiring harness between instrument cluster terminal 1O and parking sensor control module terminal 1E. ― Short to power supply or ground in wiring harness between instrument cluster terminal 1O and parking sensor control module terminal 1E. ― 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 1G. ― Short (trailer switch) to ground in parking sensor control module terminal 1H. • Parking sensor control module malfunction.

Diagnostic Procedure

Step | Inspection | Action
--- | --- | ---
1 | VERIFY MALFUNCTION SYMPTOM • Set up the vehicle according to the following conditions: ― Turn the ignition switch to the ON position. ― R position ― Vehicle is stopped. • 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 7. 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 SIGNAL • Turn the ignition switch to the ON position. • Measure the voltage of parking sensor control module terminal 1F. (See PARKING SENSOR CONTROL MODULE INSPECTION.) • Is the voltage normal? | Yes | Go to Step 7.
No | Go to the next step.
6 | INSPECT REVERSE SIGNAL • Inspect the TR switch. (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [AY6A-EL, AY6AX-EL].) • Is the TR switch normal? | Yes | Inspect and repair for open or short circuit at followings: • Between TR switch and parking sensor control module terminal 1F • Between TR switch and BCM • Between TR switch and back-up light If the wiring harnesses are normal, replace the parking sensor control module. (See PARKING SENSOR CONTROL MODULE REMOVAL/INSTALLATION.)
No | Replace the Transaxle range switch. (See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [AY6A-EL, AY6AX-EL].)
7 | VERIFY IF MALFUNCTION CAUSE IS VEHICLE SPEED SIGNAL CIRCUIT WIRING HARNESS • Turn the ignition switch to the ON position. • Measure the voltage of parking sensor control module terminal 1E. • Is the voltage normal? (See PARKING SENSOR CONTROL MODULE INSPECTION.) | Yes | Replace the parking sensor control module. (See PARKING SENSOR CONTROL MODULE REMOVAL/INSTALLATION.)
No | Go to the next step.
8 | 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 1E and instrument cluster terminal 1O.
No | Go to the instrument cluster symptom troubleshooting procedure “NO. 7 SPEEDOMETER INDICATION IS DEFECTIVE [INSTRUMENT CLUSTER]”.