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

Antenna Coil Open / Short (B2784)

DESCRIPTION This DTC is stored when there is an open or short malfunction in the transponder key amplifier coil (built into the engine switch). DTC Code DTC Detection Conditi ...

Engine Immobiliser System Malfunction (B2799)

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 ...

Other materials about Toyota 4Runner:

Inspection
INSPECTION PROCEDURE 1. INSPECT FRONT SUSPENSION UPPER ARM ASSEMBLY LH (a) As shown in the illustration, flip the ball joint stud back and forth 5 times before installing the nut. (b) Using a torque ...

Power back window
The power back window can be opened and closed using the switch or key. From inside the vehicle 1. Closing 2. One-touch closing* 3. Opening 4. One-touch opening* *: Pressing the switch in the opposite direction will stop window travel partway. Fro ...