Lexus RX (RX 350L, RX450h) 2016-2022 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

C1686

Driver Side Camera Video Sync Signal Malfunction

Side camera feedback malfunction

  • Harness or connector
  • Parking assist ECU
  • Outer rear view mirror assembly LH
    • Side television camera assembly LH
    • Outer mirror retractor LH*
  • *: w/ Power Retract Mirror

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When "!" is displayed on the multi-display 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 FOR DTC

(a) Clear the DTCs.

Chassis > Circumference Monitoring Camera Control Module > Clear DTCs

(b) Check for DTCs.

Chassis > Circumference Monitoring Camera Control Module > 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 J158 parking assist ECU connector.

(b) Disconnect the N1 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

J158-12 (LCB+) - N1-2 (LCB+)

Always

Below 1 Ω

J158-10 (LCV+) - N1-7 (LCV+)

Always

Below 1 Ω

J158-34 (LCV-) - N1-6 (LCV-)

Always

Below 1 Ω

J158-35 (LGND) - N1-1 (LGND)

Always

Below 1 Ω

J158-11 (SGND) - Body ground

Always

Below 1 Ω

J158-12 (LCB+) or N1-2 (LCB+) - Body ground

Always

10 kΩ or higher

J158-10 (LCV+) or N1-7 (LCV+) - Body ground

Always

10 kΩ or higher

J158-34 (LCV-) or N1-6 (LCV-) - Body ground

Always

10 kΩ or higher

J158-35 (LGND) or N1-1 (LGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK PARKING ASSIST ECU (LCV-, LGND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J158-35 (LGND) - Body ground

Always

Below 1 Ω

J158-34 (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) Connect the J158 parking assist ECU connector.

*a

Component with harness connected

(Parking Assist ECU)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J158-12 (LCB+) - J158-35 (LGND)

Engine switch on (IG)

5.5 to 7.05 V

NG

REPLACE PARKING ASSIST ECU

OK

5.

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

(a) Connect the N1 outer rear view mirror assembly LH connector.

(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

*c

Waveform 2

*d

Synchronization Signal

*e

Video Waveform

-

-

Measurement Condition

Item

Content

Tester Connection

J158-10 (LCV+) - J158-35 (LGND)

Tool Setting

200 mV/DIV., 50 μs./DIV.

Condition

  • Waveform 1: Engine switch on (IG), panoramic view monitor main switch (integration control and panel assembly) on, camera lens not covered, displaying image
  • Waveform 2: Engine switch on (IG), panoramic view monitor main switch (integration control and panel assembly) on, camera lens covered, blacking out screen

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 engine switch is on (ACC).

OK:

Waveform is similar to that shown in illustration.

OK

REPLACE PARKING ASSIST ECU

NG

6.

CHECK 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 > Circumference Monitoring Camera Control Module > Clear DTCs

(b) Check for DTCs.

Chassis > Circumference Monitoring Camera Control Module > Trouble Codes

OK:

DTC C1686 is not output.

Result

Proceed to

OK

A

NG (w/ Power Retract Mirror)

B

NG (w/o Power Retract Mirror)

C

A

END (SIDE TELEVISION CAMERA ASSEMBLY LH WAS DEFECTIVE)

B

REPLACE OUTER MIRROR RETRACTOR LH

C

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH

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