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:

Power Source Circuit
DESCRIPTION This is the power source circuit for the outer mirror control ECU. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT OUTER MIRROR CONTROL ECU (POWER SOURCE) Disconnect the O9 or O11 ECU connector.  Measure the voltage and resistance according to the value(s) in the t ...

Data list / active test
1. READ DATA LIST HINT: Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be disco ...

Check for intermittent problems
1. CHECK FOR INTERMITTENT PROBLEMS HINT: For use of the intelligent tester only: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with an intelligent tester when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more ...

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