Toyota Avalon Service & Repair Manual: Front Camera Feedback Malfunction (C1681)

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

DTC Output from

C1681

Front Camera Feedback Malfunction

Front television camera power supply failure

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

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 (-) auxiliary 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.

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

(a) Disconnect the K36 parking assist ECU connector.

(b) Disconnect the B5 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

K36-15 (BCB+) - B5-6 (BCB+)

Always

Below 1 Ω

K36-13 (BCV+) - B5-3 (BCV+)

Always

Below 1 Ω

K36-14 (BCV-) - B5-2 (BCV-)

Always

Below 1 Ω

K36-27 (BGND) - B5-5 (BGND)

Always

Below 1 Ω

K36-25 (SGND) - Body ground

Always

10 kΩ or higher

K36-15 (BCB+) or B5-6 (BCB+) - Body ground

Always

10 kΩ or higher

K36-13 (BCV+) or B5-3 (BCV+) - Body ground

Always

10 kΩ or higher

K36-14 (BCV-) or B5-2 (BCV-) - Body ground

Always

10 kΩ or higher

K36-27 (BGND) or B5-5 (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 K36 parking assist ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

27 (BGND) - Body ground

Always

Below 1 Ω

14 (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

K36-27 (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

K36-15 (BCB+) - K36-27 (BGND)

Power switch on (ACC)

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 power switch is on (ACC).
Measurement Condition

Item

Content

Terminal No. (Symbol)

K36-13 (BCV+) - K36-27 (BGND)

Tool Setting

200 mV/DIV., 50 μsec./DIV.

Condition

Power 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

    Steering Angle Sensor Failure (C1626)

    Front Camera Current Malfunction (C1682)

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