Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: ECU Malfunction (B1003)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Power Source & Network / Networking / Can Communication System / ECU Malfunction (B1003)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B1003

ECU Malfunction

The network gateway ECU detects an internal malfunction.

Network gateway ECU

-

PROCEDURE

1.

RECONFIRM DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Central Gateway / Trouble Codes.

Body Electrical > Central Gateway > Trouble Codes

Result

Proceed to

DTC B1003 is not output from the network gateway ECU (Techstream display: Central Gateway)

A

DTC B1003 is output from the network gateway ECU (Techstream display: Central Gateway)

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE NETWORK GATEWAY ECU

    Diagnostic Trouble Code Chart
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