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)

Engine switch on (ACC)

11 to 14 V

Engine switch off

Below 1 V

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

Engine switch on (IG)

11 to 14 V

Engine 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:

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the panoramic view monitor system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT

 Image from Camera for Panoramic View Monitor is Abnormal

DESCRIPTION The display signal from each camera is transmitted to the multi-display assembly via the parking assist ECU. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When "!" is displayed on th

 Initialization

INITIALIZATION INITIALIZE PANORAMIC VIEW MONITOR SYSTEM (a) When "!" is displayed on the multi-display assembly, correct the steering angle neutral point using the following method. (1) Fully turn the

SEE MORE:

 Short circuit in Power source circuit (C13A1)

DESCRIPTION C13A1 is stored if the power supply relay in the parking brake ECU assembly has a short circuit. C13A1 is stored if the power switch is off and a voltage of 2.5 V or higher is applied to the IG terminal and an electric parking brake switch assembly malfunction or wire harness malfunction

 Installation

INSTALLATION PROCEDURE 1. INSTALL HEATED OXYGEN SENSOR (for Bank 2) Click here 2. INSTALL HEATED OXYGEN SENSOR (for Bank 1) Click here 3. INSTALL FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst) (a) Install 2 new gaskets to the front exhaust pipe assembly (TWC: Rear Catalyst). (b) Connect the fr

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