DTC B1B46:2A [PARKING ASSIST UNIT]

id0902q6241500

Description

Rear ultrasonic sensor (RH) characteristic malfunction

Detection condition

•  Parking assist unit detected a rear ultrasonic sensor (RH) 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

•  Malfunction in accessory part installed to vehicle

―  Trailer switch (option) malfunction

•  Rear bumper external appearance damage or incorrect rear bumper installation

―  Improper installation caused by rear bumper deformation

•  Rear ultrasonic sensor (RH) malfunction

―  Scratches on sensor surface, deformation, dirt, or freezing

―  Sensor characteristic malfunction

•  Parking assist unit malfunction

System wiring diagram

Not applicable

Description	Rear ultrasonic sensor (RH) characteristic malfunction
Detection condition	• Parking assist unit detected a rear ultrasonic sensor (RH) 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 • Malfunction in accessory part installed to vehicle ― Trailer switch (option) malfunction • Rear bumper external appearance damage or incorrect rear bumper installation ― Improper installation caused by rear bumper deformation • Rear ultrasonic sensor (RH) 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 IF ACCESSORY PART IS INSTALLED • Verify if the following accessory part is installed to the vehicle. ― Trailer switch (option) • Is an accessory part installed to the vehicle?	Yes	Go to the next step.
1		No	Go to Step 3.
2	VERIFY IF MALFUNCTIONING LOCATION IS ACCESSORY PART DEPENDING ON REPEATABILITY • Switch the ignition off. • Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • Disconnect the connector of the following accessory part. ― Trailer switch (option) • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-stop)].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].) • 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 the malfunction occurred due to the accessory part installed to the vehicle.)
3	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 7. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	VERIFY IF REAR ULTRASONIC SENSOR (RH) 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.
4		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.)
5	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.
5		No	Repair or replace the rear bumper, then go to Step 7. (See REAR BUMPER REMOVAL/INSTALLATION.)
6	INSPECT REAR ULTRASONIC SENSOR (RH) SURFACE • Visually inspect the rear ultrasonic sensor (RH) sensor for the following. ― Scratches ― Deformation ― Dirt ― Freezing • Are there scratches, deformation, dirt or freezing on the rear ultrasonic sensor (RH)?	Yes	If there are scratches or deformation: • Replace the rear ultrasonic sensor (RH), 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.
6		No	Replace the rear ultrasonic sensor (RH), then go to the next step. (See REAR ULTRASONIC SENSOR REMOVAL/INSTALLATION.)
7	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 3. • If the malfunction recurs, replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	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].)
8		No	DTC troubleshooting completed.