Lexus ES manuals

Lexus ES: 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 rear television camera assembly are not normal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1622

Open or Short Circuit in Back Camera Signal

Open or short in the rear television camera signal circuit

  • Harness or connector
  • Rear television camera assembly
  • 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 multi-display 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 - REAR TELEVISION CAMERA ASSEMBLY)

(a) Disconnect the N43 parking assist ECU connector.

(b) Disconnect the T2 rear television camera assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N43-29 (CV+) - T2-3 (CV+)

Always

Below 1 Ω

N43-30 (CV-) - T2-2 (CV-)

Always

Below 1 Ω

N43-32 (CGND) - T2-5 (CGND)

Always

Below 1 Ω

N43-29 (CV+) or T2-3 (CV+) - Body ground

Always

10 kΩ or higher

N43-30 (CV-) or T2-2 (CV-) - Body ground

Always

10 kΩ or higher

N43-32 (CGND) or T2-5 (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

T2-6 (CB+) - Body ground

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK PARKING ASSIST ECU (CV-, CGND)

(a) Disconnect the N43 parking assist ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

30 (CV-) - Body ground

Always

Below 1 Ω

32 (CGND) - Body ground

Always

Below 1 Ω

*a

Component without harness connected

(Parking Assist ECU)

NG

REPLACE PARKING ASSIST ECU

OK

4.

CHECK REAR 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 rear television camera assembly.

HINT:

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

Item

Content

Terminal No. (Symbol)

N43-29 (CV+) - N43-32 (CGND)

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 REAR TELEVISION CAMERA ASSEMBLY

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