Toyota 4Runner: Antenna Coil Open / Short (B2784)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/o Smart Key System) / Antenna Coil Open / Short (B2784)

DESCRIPTION

The antenna coil receives key code signals from the transponder chip in the key grip. The coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU assembly.

This DTC is stored when there is an open or short in the antenna coil.

DTC Code	DTC Detection Condition	Trouble Area
B2784	The antenna coil is open/shorted.	Transponder key amplifier

PROCEDURE

CLEAR DTC

(a) Clear the DTCs (See page ).

2.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTC B2784 is not output.

USE SIMULATION METHOD TO CHECK

REPLACE TRANSPONDER KEY AMPLIFIER

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" bel ...

Transponder Chip Malfunction (B2793-B2795)

DESCRIPTION DTC B2793 is stored when a malfunction is found in the key during key code registration or a key code is not registered normally. Replace the key if key code registration c ...

Other materials about Toyota 4Runner:

If your vehicle needs to be towed
If towing is necessary, we recommend having your vehicle towed by your Toyota dealer or a commercial towing service, using a lift-type truck or flatbed truck. Use a safety chain system for all towing, and abide by all state/provincial and local laws. B ...

Removal
REMOVAL PROCEDURE 1. REMOVE FRONT BUMPER COVER (w/o Intuitive Parking Assist System) (See page ) 2. REMOVE FRONT BUMPER COVER (w/ Intuitive Parking Assist System) (See page ) 3. REMOVE HIGH PITCHED HORN ASSEMBLY 4. REMOVE RADIATOR GRILLE BRACKET ...