Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: ECU Malfunction (C1614)

DESCRIPTION

This DTC is stored if the parking assist ECU judges that there is an internal malfunction as a result of its self check.

HINT:

The parking assist ECU stores different types of information during initialization. If the parking assist ECU cannot read the stored information when activated, the parking assist ECU judges that there is an internal malfunction and stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1614

ECU Malfunction

  • Power source malfunction
  • Main CPU start malfunction
  • Main CPU reset detected
  • Main CPU regular monitoring malfunction
  • CAN CPU start malfunction
  • System standby malfunction
  • Main EEPROM malfunction
  • Sub EEPROM malfunction
  • Image ASIC RAM malfunction
  • ASIC status malfunction
  • ECU internal display line malfunction

Parking assist ECU

CAUTION / NOTICE / HINT

NOTICE:

  • When "!" is displayed on the multi-display assembly after the cable is disconnected from the negative (-) battery terminal, correct the steering angle neutral point.

    Click here

  • Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the panoramic view monitor system may be needed.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (PARKING ASSIST ECU STATUS)

(a) Use the Data List to check if the parking assist ECU status is functioning properly.

Click here

Chassis > Circumference Monitoring Camera Control Module > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Main CPU Forced Termination Detection Record

A history item indicating that the main CPU did not enter standby status within 15 seconds of turning the engine switch off and a forced end was applied

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Main CPU Abnormal Response Record

A history item indicating that the main CPU became unresponsive in normal status

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Main CPU Abnormal Reset Record

A history item indicating that the main CPU was reset, although the engine switch was not turned off in normal status

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Image Processing IC Written Protect Record

A history item indicating that the image processing IC memory was write protected

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Image Processing IC Initialized Malfunction Record

A history item indicating that the image processing IC memory was not initialized

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Main EEPROM Access Status

Main EEPROM access status

OK/NG

OK: Parking assist ECU is normal

NG: Parking assist ECU is abnormal

-

Sub EEPROM Access Status

Sub-EEPROM access status

OK/NG

OK: Parking assist ECU is normal

NG: Parking assist ECU is abnormal

-

System Power Supply Voltage Malfunction Record

A history item indicating an abnormally generated-voltage value from the system power source

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Main CPU Starting Malfunction Record

A history item indicating that the main CPU did not start

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

CAN CPU Boot Malfunction Record

A history item indicating that the CPU controlling the input and output of the information obtained via the CAN communication system did not start and the information could not be retrieved

Unrec/Rec

Unrec: Parking assist ECU is normal

Rec: Parking assist ECU is abnormal

-

Chassis > Circumference Monitoring Camera Control Module > Data List

Tester Display

Main CPU Forced Termination Detection Record

Main CPU Abnormal Response Record

Main CPU Abnormal Reset Record

Image Processing IC Written Protect Record

Image Processing IC Initialized Malfunction Record

Main EEPROM Access Status

Sub EEPROM Access Status

System Power Supply Voltage Malfunction Record

Main CPU Starting Malfunction Record

CAN CPU Boot Malfunction Record

Result

Proceed to

OK is displayed for all items

A

NG is displayed

B

A

USE SIMULATION METHOD TO CHECK

B

2.

CHECK FOR DTC

(a) Clear the DTCs.

Chassis > Circumference Monitoring Camera Control Module > Clear DTCs

(b) Check for DTCs.

Chassis > Circumference Monitoring Camera Control Module > Trouble Codes

OK:

DTC C1614 is not output.

HINT:

  • If DTC C1614 is output, perform the procedure to allow the parking assist ECU to store the vehicle information again.
  • If DTC C1614 is still output after performing the procedure to make the parking assist ECU store the vehicle information 3 times, replace the parking assist ECU.
  • If DTC C1614 is output frequently, replace the parking assist ECU even though the DTC is not output when rechecking for DTCs.
OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE PARKING ASSIST ECU

    Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Th ...

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