Toyota Avalon Service & Repair Manual: Open or Short Circuit in Back Camera Signal (C1622)

DESCRIPTION

DTC C1622 is stored if the parking assist ECU judges as a result of its self check that the signals or signal lines between the parking assist ECU and the television camera assembly are not normal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C1622

Open or Short Circuit in Back Camera Signal

Open or short in the rear television camera signal circuit

  • Harness or connector
  • Television camera assembly
  • Parking assist ECU

Parking assist ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • 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

  • 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 - TELEVISION CAMERA ASSEMBLY)

(a) Disconnect the K36 parking assist ECU connector.

(b) Disconnect the P7 television camera assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K36-1 (CV+) - P7-3 (CV+)

Always

Below 1 Ω

K36-2 (CV-) - P7-2 (CV-)

Always

Below 1 Ω

K36-9 (CGND) - P7-5 (CGND)

Always

Below 1 Ω

K36-8 (SGND) - Body ground

Always

10 kΩ or higher

K36-1 (CV+) or P7-3 (CV+) - Body ground

Always

10 kΩ or higher

K36-2 (CV-) or P7-2 (CV-) - Body ground

Always

10 kΩ or higher

K36-9 (CGND) or P7-5 (CGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (ACC POWER SUPPLY - GROUND)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

P7-6 (CB+) - Body ground

Engine switch on (ACC)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK PARKING ASSIST ECU (CV-, CGND)

(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

2 (CV-) - Body ground

Always

Below 1 Ω

9 (CGND) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Parking Assist ECU)

NG

REPLACE PARKING ASSIST ECU

OK

4.

CHECK TELEVISION CAMERA ASSEMBLY (CV+, CGND)

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

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

HINT:

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

Item

Content

Terminal No. (Symbol)

K36-1 (CV+) - K36-9 (CGND)

Tool Setting

200 mV/DIV., 50 μsec./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 TELEVISION CAMERA ASSEMBLY

    Back Camera Power Supply Failure (C1621)

    Open or Short in Steering Angle Sensor +B (C1625)

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