Toyota 4Runner: ID BOX EEPROM Malfunction (B2790)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/ Smart Key System) / ID BOX EEPROM Malfunction (B2790)

DESCRIPTION

This DTC is stored when the ID code box detects an internal malfunction.

DTC Code	DTC Detection Condition	Trouble Area
B2790	The ID code box detects an internal malfunction.	ID code box Certification ECU

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the certification ECU, refer to Registration (See page ).

PROCEDURE

1.	REPLACE ID CODE BOX

(a) Replace the ID code box (See page ).

2.	REGISTER RECOGNITION CODES

(a) Register the recognition codes in the ECUs (See page ).

3.	REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).

CLEAR DTC

(a) Clear the DTCs (See page ).

5.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTC B2790 is not output.

END (ID CODE BOX IS DEFECTIVE)

REPLACE CERTIFICATION ECU

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DESCRIPTION This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the ID code box; 2) the ECM detects errors in the communication lines; or ...

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