Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Back Camera Current Malfunction (C1621)

DESCRIPTION

DTC C1621 is stored if the parking assist ECU determines that the input/output signal communication with the rear television camera assembly is abnormal.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1621

Back Camera Current Malfunction

Rear television camera assembly power supply malfunction

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

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

(a) Disconnect the J158 parking assist ECU connector.

(b) Disconnect the Z11 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

J158-33 (CB+) - Z11-6 (CB+)

Always

Below 1 Ω

J158-32 (CGND) - Z11-5 (CGND)

Always

Below 1 Ω

J158-33 (CB+) or Z11-6 (CB+) - Body ground

Always

10 kΩ or higher

J158-32 (CGND) or Z11-5 (CGND) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK PARKING ASSIST ECU (CB+, CGND)

(a) Connect the J158 parking assist ECU connector.

*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

J158-32 (CGND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J158-33 (CB+) - J158-32 (CGND)

Engine switch on (IG)

5.5 to 7.05 V

OK

REPLACE REAR TELEVISION CAMERA ASSEMBLY

NG

REPLACE PARKING ASSIST ECU

    ECU Malfunction (C1614)
    DESCRIPTION This DTC is stored if the parking assist ECU judges that there is an internal malfunction as a result of its self check. HINT: The parking assist ECU stores different types of information ...

    Back Camera Feedback Malfunction (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 a ...

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