Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: ECU Power Source Circuit

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Panoramic View Monitor System / ECU Power Source Circuit

DESCRIPTION

This circuit is the power source circuit to operate the parking assist ECU. The parking assist ECU controls the panoramic view monitor system.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuse for circuits related to this system before performing the following inspection procedure.

HINT:

If the parking assist ECU does not operate due to a power source problem, other system DTCs may be stored due to a CAN communication interruption.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - BODY GROUND)

(a) Disconnect the J159 parking assist ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J159-4 (GND1) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU POWER SOURCE)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J159-1 (+B) - J159-4 (GND1)

Always

11 to 14 V

J159-2 (ACC) - J159-4 (GND1)

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

J159-3 (IG) - J159-4 (GND1)

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

*a

Front view of wire harness connector

(to Parking Assist ECU)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    "CHK" message(s) are displayed on the SIGNAL CHECK screen.
    DESCRIPTION On the SIGNAL CHECK screen, it is possible to check if the signals sent to the parking assist ECU are normal. Click here HINT: On the SIGNAL CHECK screen, "OK" (blue) is displayed for ...

    Image from Camera for Panoramic View Monitor is Abnormal
    DESCRIPTION The display signal from the rear television camera assembly is transmitted to the multi-display assembly via the parking assist ECU. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Whe ...

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