Dtc B2784 Antenna Coil Open / Short

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ENGINE SWITCH)

REPLACE ENGINE SWITCH

CLEAR DTC

CHECK FOR DTC

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a past DTC.

DTC Code
DTC Detection Condition
Trouble Area
B2784
The transponder key amplifier coil built into the engine switch is open (see below) or shorted (determined by communication with certification ECU [smart key ECU assembly]). (1 trip detection logic*)
  1. Terminal AGND, VC5, TXCT or CODE circuit is open (includes disconnection of the engine switch).
  2. The transponder key amplifier coil built into the engine switch is open.
  1. Engine switch
  2. Certification ECU (smart key ECU assembly)
  3. Harness or connector
  1. *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Operation when Malfunction Detected
Engine cannot be started when transmitter battery is depleted by holding transmitter near engine switch and pressing and holding engine switch with shift lever in P
-

Related Data List and Active Test
DTC Code
Data List and Active Test
B2784
-

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2784 Antenna Coil Open / Short


INSPECTION PROCEDURE

NOTICE:
  1. When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  2. Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.
  3. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ENGINE SWITCH)

  1. Disconnect the E130 certification ECU (smart key ECU assembly) connector.

  1. Disconnect the E123 engine switch connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E130-15 (VC5) - E123-10 (VC5)
    		Always
    		Below 1 Ω
    E130-14 (TXCT) - E123-7 (TXCT)
    		Always
    		Below 1 Ω
    E130-13 (CODE) - E123-8 (CODE)
    		Always
    		Below 1 Ω
    E130-12 (AGND) - E123-6 (AGND)
    		Always
    		Below 1 Ω
    E130-15 (VC5) or E123-10 (VC5) - Body ground
    		Always
    		10 kΩ or higher
    E130-14 (TXCT) or E123-7 (TXCT) - Body ground
    		Always
    		10 kΩ or higher
    E130-13 (CODE) or E123-8 (CODE) - Body ground
    		Always
    		10 kΩ or higher
    E130-12 (AGND) or E123-6 (AGND) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.REPLACE ENGINE SWITCH

  1. Temporarily replace the engine switch with a new or known good one.

    1. for 3UR-FE: Click here
    2. for 1UR-FE: Click here
    3. for 1GR-FE: Click here
    4. for 1VD-FTV: Click here

NEXT


3.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


4.CHECK FOR DTC

  1. Perform "DTC Output Confirmation Operation" procedure.

  1. Check for DTCs (Click here).

    OK:
    DTC B2784 is not output.


NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK

END (ENGINE SWITCH WAS DEFECTIVE)