Toyota Venza manuals

Toyota Venza: Antenna Coil Open / Short (B2784)

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, then it is output to the transponder key ECU assembly.

DTC No.

DTC Detection Condition

Trouble Area

B2784

Antenna coil is open/shorted.

  • Wire harness or connector
  • Transponder key amplifier
  • Transponder key ECU assembly

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly is replaced, register the key and ECU communication ID (See page ).


PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Immobiliser / Data List.

(e) Read the Data List according to the display on the Techstream.

Immobiliser (Transponder Key ECU Assembly)

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Antenna Coil Status

Transponder key amplifier coil condition/Normal or Fail

Normal: Antenna coil normal

Fail: Antenna coil malfunctioning

-

OK:

On the Techstream screen, the item displays Normal according to the chart above.


OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY


NG

2.

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

(a) Disconnect the transponder key ECU assembly connector.

(b) Disconnect the transponder key amplifier connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D22-4 (TXCT) - D21-5 (TXCT)

Always

Below 1 Ω

D22-5 (AGND) - D21-7 (AGND)

Always

Below 1 Ω

D22-14 (VC5) - D21-1 (VC5)

Always

Below 1 Ω

D22-15 (CODE) - D21-4 (CODE)

Always

Below 1 Ω

D22-4 (TXCT) - Body ground

Always

10 kΩ or higher

D22-5 (AGND) - Body ground

Always

10 kΩ or higher

D22-14 (VC5) - Body ground

Always

10 kΩ or higher

D22-15 (CODE) - Body ground

Always

10 kΩ or higher

D21-5 (TXCT) - Body ground

Always

10 kΩ or higher

D21-7 (AGND) - Body ground

Always

10 kΩ or higher

D21-1 (VC5) - Body ground

Always

10 kΩ or higher

D21-4 (CODE) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

(to Transponder Key ECU Assembly)

*2

Front view of wire harness connector

(to Transponder Key Amplifier)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

INSPECT TRANSPONDER KEY AMPLIFIER (POWER SOURCE AND GROUND)

(a) Reconnect the transponder key ECU assembly connector.

(b) Reconnect the transponder key amplifier connector.


(c) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

D22-14 (VC5) - Body ground

No key is in ignition key cylinder

Below 1 V

D22-14 (VC5) - Body ground

Key is in ignition key cylinder

4.6 to 5.4 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

D22-5 (AGND) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Component with harness connected

(Transponder Key ECU Assembly)


OK

REPLACE TRANSPONDER KEY AMPLIFIER


NG

REPLACE TRANSPONDER KEY ECU ASSEMBLY

Push Switch / Key Unlock Warning Switch Malfunction (B2780)
DESCRIPTION This DTC is stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is ON even when the ignition switch is ON. Under normal conditions, the ...

Transponder Chip Malfunction (B2793)
DESCRIPTION This DTC 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 the key code registration is not pe ...

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