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. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
If the transponder key ECU assembly is replaced, register the key and ECU communication
ID (See page .gif)
).
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 | .gif) |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
|
.gif)
|
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 |
|
*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 |
|
|
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 |
|
*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
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normal conditions, the ...
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DESCRIPTION
This DTC is stored when a malfunction is found in the key during key code registration
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