DTC B1B48:2A [PARKING ASSIST UNIT]

id0902q6241700

Description	Rear corner ultrasonic sensor (LH) characteristic malfunction
Detection condition	• Parking assist unit detected a rear 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 • Rear bumper external appearance damage or incorrect rear bumper installation ? Improper installation caused by rear bumper deformation • Rear 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. (See CLEARING DTC [PARKING ASSIST UNIT].) • Retrieve the parking assist unit DTCs using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT].) • Is DTC U3000:49 displayed?	Yes	Replace the parking assist unit, then go to Step 5. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
1		No	Go to the next step.
2	VERIFY IF REAR CORNER ULTRASONIC SENSOR (LH) CHARACTERISTIC DETERIORATES TEMPORARILY • Clear the DTC for the parking assist unit using the M-MDS. (See CLEARING DTC [PARKING ASSIST UNIT].) • Retrieve the parking assist unit DTCs using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT].) • Is the same DTC displayed?	Yes	Go to the next step.
2		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 REAR BUMPER EXTERNAL APPEARANCE AND INSTALLATION CONDITION • Verify that the rear bumper external appearance and installation condition. • Are the rear bumper external appearance and installation condition normal?	Yes	Go to the next step.
3		No	Repair or replace the rear bumper, then go to Step 5. (See REAR BUMPER REMOVAL/INSTALLATION.)
4	INSPECT REAR CORNER ULTRASONIC SENSOR (LH) SURFACE • Visually inspect the rear corner ultrasonic sensor (LH) sensor for the following. ? Scratches ? Deformation ? Dirt ? Freezing • Are there scratches, deformation, dirt or freezing on the rear corner ultrasonic sensor (LH)?	Yes	If there are scratches or deformation: • Replace the rear corner ultrasonic sensor (LH), then go to the next step. (See REAR ULTRASONIC SENSOR REMOVAL/INSTALLATION.) If there is dirt or freezing: • Remove dirt or freezing, then go to the next step.
4		No	Replace the rear corner ultrasonic sensor (LH), then go to the next step. (See REAR ULTRASONIC SENSOR REMOVAL/INSTALLATION.)
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Clear the DTC for the parking assist unit using the M-MDS. (See CLEARING DTC [PARKING ASSIST UNIT].) • Retrieve the parking assist unit DTCs using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.) Go to the next step.
5		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].)
6		No	DTC troubleshooting completed.