Toyota RAV4 manuals

Toyota Sienna Service Manual: Antenna Coil Open / Short

DTC B2784 Antenna Coil Open / Short

DESCRIPTION

The transponder key coil is built into the transponder key amplifier and receives a key code signal from the transponder chip in the key. This signal is amplified by the amplifier, and output to the transponder key ECU.

DTC No.

DTC Detection Condition

Trouble Area

B2784

Antenna coil open/short
  • Transponder key amplifier
  • Wire harness
  • Transponder key ECU assembly

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester (with CAN VIM) to the DLC3.
  2.  Turn the ignition switch on and turn the intelligent tester main switch on.
  3.  Select ANTENNA COIL in the DATA LIST and read the value displayed on the intelligent tester.

Transponder key ECU:

Transponder key ECU

OK: NORMAL (Antenna coil is normal) appears on the screen.

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

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

  1. Disconnect the T6 ECU and I14 switch connectors.
  2.  Measure the resistance according to the value(s) in the table below.

Resistance

Resistance

3 INSPECT TRANSPONDER KEY ECU ASSEMBLY

 INSPECT TRANSPONDER KEY ECU ASSEMBLY

  1. Reconnect the T6 ECU and I14 amplifier connectors.
  2.  Measure the voltage according to the value(s) in the table below.

Voltage

Voltage

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

Resistance

Resistance

REPLACE TRANSPONDER KEY AMPLIFIER

Push Switch / Key Unlock Warning Switch Malfunction
DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction DESCRIPTION This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is on even when the ign ...

Transponder Chip Malfunction
DTC B2793 Transponder Chip Malfunction DESCRIPTION This DTC is output when a malfunction is found in the key during the key code registration or the key code is not registered normally. Replace t ...

Other materials:

Fail-safe chart
1. FAIL-SAFE FUNCTION When communication fails in any of the main wires (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning. The table below shows the effects on eac ...

On-vehicle inspection
1. INSPECT REAR AXLE HUB BEARING BACKLASH (a) Using a dial gauge, check for backlash near the center of the axle hub. Maximum: 0.05 mm (0.0020 in.) If backlash exceeds the maximum, replace the axle hub assembly. NOTICE: Ensure that the dial gauge is set at right angles to the measuremen ...

DTC check / clear
1. CHECK DTC  Connect the intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3.  Turn the ignition switch on.  Turn the tester ON.  Enter the following menu items: DIAGNOSIS / OBD/ MOBD / IM ...

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