Lexus ES manuals

Lexus ES: 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 N44 parking assist ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

N44-4 (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) Disconnect the N44 parking assist ECU connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

N44-1 (+B) - N44-4 (GND1)

Always

11 to 14 V

N44-2 (ACC) - N44-4 (GND1)

Power switch on (ACC)

11 to 14 V

Power switch off

Below 1 V

N44-3 (IG) - N44-4 (GND1)

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ NEXT:

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