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:

 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:

 Inverter Low-voltage Circuit

DESCRIPTION The cause of the malfunction may be the low-voltage circuit. Check whether there is an open circuit in the inverter +B low-voltage power source system or a problem in the communication between the hybrid vehicle control ECU and inverter. Related Parts Check Area Inspection Inver

 Components

COMPONENTS ILLUSTRATION *A w/o Rear Sunshade *B w/ Rear Sunshade *1 CENTER STOP LIGHT SET *2 NO. 2 PACKAGE TRAY TRIM PANEL ASSEMBLY *3 PACKAGE TRAY TRIM PANEL ASSEMBLY *4 REAR SEAT OUTER BELT ASSEMBLY LH *5 REAR SEAT OUTER BELT ASSEMBLY RH *6 REAR SEAT SHOULDE

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