DTC B1B40:2A [PARKING ASSIST UNIT]

id0902q6240900

Description

Front corner ultrasonic sensor (LH) characteristic malfunction
Detection condition
•  Parking assist unit detected a front corner ultrasonic sensor (LH) characteristic malfunction with the ignition switched ON (engine off or on).
Fail-safe
Not applicable
Possible cause
Note
•  If the vehicle is driven under the following situations, the parking assist unit may output a DTC.
―  A place where muddy water is spattered
―  Cold region
•  Front bumper external appearance damage or incorrect front bumper installation
―  Improper installation caused by front bumper deformation
•  Front corner ultrasonic sensor (LH) malfunction
―  Scratches on sensor surface, deformation, dirt, or freezing
―  Sensor characteristic malfunction
•  Parking assist unit malfunction
System wiring diagram
Not applicable

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY OTHER PARKING ASSIST UNIT DTCs
•  Clear the DTC for the parking assist unit using the M-MDS.
•  Retrieve the parking assist unit DTCs using the M-MDS.
•  Is DTC U3000:49 displayed?
Yes
Replace the parking assist unit, then go to Step 5.
(See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
No
Go to the next step.
2
VERIFY IF FRONT CORNER ULTRASONIC SENSOR (LH) CHARACTERISTIC DETERIORATES TEMPORARILY
•  Clear the DTC for the parking assist unit using the M-MDS.
•  Retrieve the parking assist unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
System is normal. (Explain to the customer that there is a temporary malfunction due to driving in a place where muddy water was splashed, or driving in a cold region.)
3
VERIFY FRONT BUMPER EXTERNAL APPEARANCE AND INSTALLATION CONDITION
•  Verify that the front bumper external appearance and installation condition.
•  Are the front bumper external appearance and installation condition normal?
Yes
Go to the next step.
No
Repair or replace the front bumper, then go to Step 5.
(See FRONT BUMPER REMOVAL/INSTALLATION.)
4
INSPECT FRONT CORNER ULTRASONIC SENSOR (LH) SURFACE
•  Visually inspect the front corner ultrasonic sensor (LH) sensor for the following.
―  Scratches
―  Deformation
―  Dirt
―  Freezing
•  Are there scratches, deformation, dirt or freezing on the front corner ultrasonic sensor (LH)?
Yes
If there are scratches or deformation:
•  Replace the front corner ultrasonic sensor (LH), then go to the next step.
If there is dirt or freezing:
•  Remove dirt or freezing, then go to the next step.
No
Replace the front corner ultrasonic sensor (LH), then go to the next step.
(See FRONT ULTRASONIC SENSOR REMOVAL/INSTALLATION.)
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Clear the DTC for the parking assist unit using the M-MDS.
•  Retrieve the parking assist unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the parking assist unit.
Go to the next step.
No
Go to the next step.
6
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PARKING ASSIST UNIT].)
No
DTC troubleshooting completed.