Dtc B2784 Antenna Coil Open / Short

Vehicle Interior. Yaris. Ncp93, 131
Theft Deterrent Keyless Entry. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

The transponder key coil receives key code signals from the key's transponder chip. The coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU.

DTC No.
DTC Detection Condition
Trouble Area
B2784
Antenna coil is open/short
  1. Wire harness
  2. Transponder key amplifier
  3. Transponder key ECU assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2784 Antenna Coil Open / Short


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body Electrical / Immobiliser / Data List.

  1. According to the display on tester, read the "Data List".


Immobiliser:
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
Antenna Coil Status
Antenna coil condition/
NORMAL or FAIL
NORMAL: Antenna coil is normal
FAIL: Antenna coil is malfunctioning
-
OK:
"NORMAL" (antenna coil is normal) appears on the screen.


NG
Go to step 2
OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000003BHZ005X.html)

2.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2784 Antenna Coil Open / Short

  1. Disconnect the D23 transponder key ECU connector.

  1. Disconnect the D24 transponder key amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D23-14 (VC5) - D24-1 (VC5)
    		Below 1 Ω
    D23-15 (CODE) - D24-4 (CODE)
    		Below 1 Ω
    D23-4 (TXCT) - D24-5 (TXCT)
    		Below 1 Ω
    D23-5 (AGND) - D24-7 (AGND)
    		Below 1 Ω
    D23-14 (VC5) or D24-1 (VC5) -
    Body ground
    		10 kΩ or higher
    D23-15 (CODE) or D24-4 (CODE) -
    Body ground
    		10 kΩ or higher
    D23-4 (TXCT) or D24-5 (TXCT) -
    Body ground
    		10 kΩ or higher
    D23-5 (AGND) or D24-7 (AGND) -
    Body ground
    		10 kΩ or higher

  1. Reconnect the D23 transponder key ECU connector.

  1. Reconnect the D24 transponder key amplifier connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY AMPLIFIER (YARIS_NCP93 RM0000032ZQ00EX.html)