Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual: 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

(a) Disconnect the J159 parking assist ECU connector.

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

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(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