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
    DIAGNOSTIC TROUBLE CODE CHART Diagnostic Trouble Code Chart DTC No. Detection Item Trouble Area Note Link B1003 ECU Malfunction Network gateway ECU - U0199 Lost Communi ...

    Lost Communication with "Door Control Module B" (U0200)
    DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Note U0200 Lost Communication with "Door Control Module B" No communication from the outer mirror control ECU ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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