Toyota Avalon Service & Repair Manual: Driver Side Camera Video Sync Signal Malfunction (C1686)

DESCRIPTION

This DTC 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 driver side television camera assembly to the parking assist ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C1686

Driver Side Camera Video Sync Signal Malfunction

Side camera feedback malfunction

  • Harness or connector
  • Parking assist ECU
  • Side television camera assembly LH
  • Outer rear view mirror assembly LH

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.
  • 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 FOR DTC

(a) Clear the DTCs.

Chassis > Panoramic View Monitor > Clear DTCs

(b) Check for DTCs.

Chassis > Panoramic View Monitor > Trouble Codes

OK:

DTC C1686 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - OUTER REAR VIEW MIRROR ASSEMBLY LH)

(a) Disconnect the K36 parking assist ECU connector.

(b) Disconnect the I29 outer rear view mirror assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K36-12 (LCB+) - I29-14 (LCB+)

Always

Below 1 Ω

K36-10 (LCV+) - I29-15 (LCV+)

Always

Below 1 Ω

K36-11 (LCV-) - I29-16 (LCV-)

Always

Below 1 Ω

K36-24 (LGND) - I29-17 (LGND)

Always

Below 1 Ω

K36-23 (SGND) - I29-18 (SGND)

Always

Below 1 Ω

K36-12 (LCB+) or I29-14 (LCB+) - Body ground

Always

10 kΩ or higher

K36-10 (LCV+) or I29-15 (LCV+) - Body ground

Always

10 kΩ or higher

K36-11 (LCV-) or I29-16 (LCV-) - Body ground

Always

10 kΩ or higher

K36-24 (LGND) or I29-17 (LGND) - Body ground

Always

10 kΩ or higher

K36-23 (SGND) or I29-18 (SGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK PARKING ASSIST ECU (LCV-, LGND)

(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

24 (LGND) - Body ground

Always

Below 1 Ω

11 (LCV-) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Parking Assist ECU)

NG

REPLACE PARKING ASSIST ECU

OK

4.

CHECK PARKING ASSIST ECU (LCB+, LGND)

(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

K36-24 (LGND) - 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

K36-12 (LCB+) - K36-24 (LGND)

Power switch on (ACC)

5.5 to 7.05 V

NG

REPLACE PARKING ASSIST ECU

OK

5.

CHECK SIDE TELEVISION CAMERA ASSEMBLY LH (LCV+, LGND)

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

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

HINT:

A waterproof connector is used for the side television camera assembly LH. 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 side television camera assembly LH.
  • The video waveform is constantly output when the power switch is on (ACC).
Measurement Condition

Item

Content

Tester Connection

K36-10 (LCV+) - K36-24 (LGND)

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 illustration.

OK

REPLACE PARKING ASSIST ECU

NG

6.

REPLACE SIDE TELEVISION CAMERA ASSEMBLY LH

(a) Replace the side television camera assembly LH with a new or normally functioning one.

Click here

NEXT

7.

CHECK FOR DTC

(a) Clear the DTCs.

Chassis > Panoramic View Monitor > Clear DTCs

(b) Check for DTCs.

Chassis > Panoramic View Monitor > Trouble Codes

OK:

DTC C1686 is not output.

OK

END (SIDE TELEVISION CAMERA ASSEMBLY LH IS DEFECTIVE)

NG

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

    Side Camera Current Malfunction (C1684)

    Over Current Detected in Driver Side Camera (C1687)

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