DTC U0420:83 [PARKING ASSIST UNIT (OPTICAL)]

id0902r0055800

Description

Error signal received from electric power steering (EPS) control module

Detection condition

•  The parking assist unit (optical) detects a signal error from the electric power steering (EPS) control module for a certain period of time or more.

Fail-safe

•  Projected vehicle path is not displayed when system is starting

Possible cause

•  DTCs are stored in the electric power steering (EPS) control module.

•  Electric power steering (EPS) control module malfunction

•  Parking assist unit (optical) malfunction

System wiring diagram

Not applicable

Description	Error signal received from electric power steering (EPS) control module
Detection condition	• The parking assist unit (optical) detects a signal error from the electric power steering (EPS) control module for a certain period of time or more.
Fail-safe	• Projected vehicle path is not displayed when system is starting
Possible cause	• DTCs are stored in the electric power steering (EPS) control module. • Electric power steering (EPS) control module malfunction • Parking assist unit (optical) malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY 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 the same DTC displayed?	Yes	Replace the parking assist unit (optical), then go to Step 4. (See PARKING ASSIST UNIT (OPTICAL) REMOVAL/INSTALLATION.)
1		No	Go to the next step.
2	VERIFY ELECTRIC POWER STEERING (EPS) CONTROL MODULE DTCs • Retrieve the electric power steering (EPS) control module DTCs using the M-MDS. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS [ELECTRIC POWER STEERING (EPS)].)
2		No	Go to the next step.
3	VERIFY IF MALFUNCTIONING LOCATION IS ELECTRIC POWER STEERING (EPS) CONTROL MODULE DEPENDING ON REPEATABILITY • 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	Replace the electric power steering (EPS) control module, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
3		No	Go to Step 5.
4	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • 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.
4		No	Go to the next step.
5	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)].)
5		No	DTC troubleshooting completed.