DTC B12BD:16 [PARKING ASSIST UNIT (OPTICAL)]

id0902r0054800

Description

Rear mount camera internal voltage malfunction

Detection condition

•  The parking assist unit (optical) detects that the power outlet voltage of the rear mount camera is less than the specified range for a certain period of time.

Fail-safe

•  Black screen displayed when system is starting

Possible cause

•  Parking assist unit (optical) connector or terminal malfunction

•  Rear mount camera connector or terminal malfunction

•  Rear mount camera power supply circuit malfunction

―  Short to ground in wiring harness between parking assist unit (optical) terminal U and rear mount camera terminal A

―  Open circuit in wiring harness between parking assist unit (optical) terminal U and rear mount camera terminal A

•  Rear mount camera malfunction

•  Parking assist unit (optical) malfunction

Description	Rear mount camera internal voltage malfunction
Detection condition	• The parking assist unit (optical) detects that the power outlet voltage of the rear mount camera is less than the specified range for a certain period of time.
Fail-safe	• Black screen displayed when system is starting
Possible cause	• Parking assist unit (optical) connector or terminal malfunction • Rear mount camera connector or terminal malfunction • Rear mount camera power supply circuit malfunction ― Short to ground in wiring harness between parking assist unit (optical) terminal U and rear mount camera terminal A ― Open circuit in wiring harness between parking assist unit (optical) terminal U and rear mount camera terminal A • Rear mount camera malfunction • Parking assist unit (optical) malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY OTHER PARKING ASSIST UNIT (OPTICAL) DTCs • Clear the DTC for the parking assist unit (optical) using the M-MDS. (See CLEARING DTC [PARKING ASSIST UNIT (OPTICAL)].) • Retrieve the parking assist unit (optical) DTCs using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT (OPTICAL)].) • Is DTC U3000:41 or U3000:49 displayed?	Yes	Replace the parking assist unit (optical), then go to Step 7. (See PARKING ASSIST UNIT (OPTICAL) REMOVAL/INSTALLATION.)
1		No	Go to the next step.
2	INSPECT PARKING ASSIST UNIT (OPTICAL) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the parking assist unit (optical) connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 7.
3	INSPECT REAR MOUNT CAMERA CONNECTOR CONDITION • Disconnect the rear mount camera connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector, then go to Step 7.
4	INSPECT REAR MOUNT CAMERA CIRCUIT FOR SHORT TO GROUND • Verify that the rear mount camera and parking assist unit (optical) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Rear mount camera terminal A • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Parking assist unit (optical) terminal U—Rear mount camera terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 8.
4		No	Go to the next step.
5	INSPECT REAR MOUNT CAMERA CIRCUIT FOR OPEN CIRCUIT • Verify that the rear mount camera and parking assist unit (optical) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Parking assist unit (optical) terminal U—Rear mount camera terminal A • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Parking assist unit (optical) terminal U—Rear mount camera terminal A If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT REAR MOUNT CAMERA • Inspect the rear mount camera. (See REAR MOUNT CAMERA INSPECTION.) • Is the rear mount camera normal?	Yes	Go to the next step.
6		No	Replace the rear mount camera, then go to the next step. (See REAR MOUNT CAMERA REMOVAL/INSTALLATION.)
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the parking assist unit (optical) using the M-MDS. (See CLEARING DTC [PARKING ASSIST UNIT (OPTICAL)].) • Retrieve the parking assist unit (optical) DTCs using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT (OPTICAL)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the parking assist unit (optical). (See PARKING ASSIST UNIT (OPTICAL) 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 (OPTICAL)].)
8		No	DTC troubleshooting completed.