Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018J5C
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PARK ASSIST / MONITORING: PANORAMIC VIEW MONITOR SYSTEM: C1681; Front Camera Feedback Malfunction; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

C1681

Front Camera Feedback Malfunction

DESCRIPTION

DTC C1681 is stored if the parking assist ECU judges as a result of its self check that a synchronization problem is occurring in the image signal sent from the front television camera assembly to the parking assist ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1681

Front Camera Feedback Malfunction

Front television camera power supply failure

  • Harness or connector
  • Front television camera assembly
  • Parking assist ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; PARK ASSIST / MONITORING: PANORAMIC VIEW MONITOR SYSTEM: INITIALIZATION

  • 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 2018 - 2020 MY Sienna [11/2017 -        ]; PARK ASSIST / MONITORING: PANORAMIC VIEW MONITOR SYSTEM: CALIBRATION

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - FRONT TELEVISION CAMERA ASSEMBLY)

(a) Disconnect the D201 parking assist ECU connector.

(b) Disconnect the A76 front television camera assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D201-15 (BCB+) - A76-6 (BCB+)

Always

Below 1 Ω

D201-36 (BCV+) - A76-3 (BCV+)

Always

Below 1 Ω

D201-13 (BCV-) - A76-2 (BCV-)

Always

Below 1 Ω

D201-37 (BGND) - A76-5 (BGND)

Always

Below 1 Ω

D201-14 (SGND) - Body ground

Always

10 kΩ or higher

D201-15 (BCB+) or A76-6 (BCB+) - Body ground

Always

10 kΩ or higher

D201-36 (BCV+) or A76-3 (BCV+) - Body ground

Always

10 kΩ or higher

D201-13 (BCV-) or A76-2 (BCV-) - Body ground

Always

10 kΩ or higher

D201-37 (BGND) or A76-5 (BGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK PARKING ASSIST ECU (BCV-, BGND)

(a) Disconnect the D201 parking assist ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

37 (BGND) - Body ground

Always

Below 1 Ω

13 (BCV-) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Parking Assist ECU)

NG

REPLACE PARKING ASSIST ECU

OK

3.

CHECK PARKING ASSIST ECU (BCB+, BGND)

(a) Remove the parking assist ECU with the connector still connected.

*a

Component with harness connected

(Parking Assist ECU)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D201-37 (BGND) - Body ground

Always

Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

D201-15 (BCB+) - D201-37 (BGND)

Engine switch on (IG)

5.5 to 7.05 V

NG

REPLACE PARKING ASSIST ECU

OK

4.

CHECK FRONT TELEVISION CAMERA ASSEMBLY (BCV+, BGND)

(a) Remove the parking assist ECU with the connector still connected.

(b) Using an oscilloscope, check the waveform of the front television camera assembly.

HINT:

A waterproof connector is used for the front television camera assembly. Therefore, inspect the waveform at the parking assist ECU with the connector connected.

*a

Component with harness connected

(Parking Assist ECU)

*b

Waveform 1 (camera lens not covered, displaying an image)

*c

Waveform 2 (camera lens covered, blacking out the screen)

*d

Synchronization Signal

*e

Video Waveform

-

-

HINT:

  • The video waveform changes according to the image sent by the front television camera assembly.
  • The video waveform is constantly output when the engine switch is on (ACC).

Measurement Condition

Item

Content

Terminal No. (Symbol)

D201-36 (BCV+) - D201-37 (BGND)

Tool Setting

200 mV/DIV., 50 μs./DIV.

Condition

Engine switch on (IG), panoramic view monitor system operating

OK:

Waveform is similar to that shown in the illustration.

OK

REPLACE PARKING ASSIST ECU

NG

REPLACE FRONT TELEVISION CAMERA ASSEMBLY