Toyota Corolla Cross: Antenna Coil Open / Short (B2784)
DESCRIPTION
When an open or short circuit is detected in the antenna coil built into the transponder key coil, the transponder key ECU assembly stores this DTC.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note |
|---|---|---|---|---|
| B2784 |
Antenna Coil Open / Short |
The antenna coil in the transponder key coil is open/shorted. |
| DTC Output Confirmation Operation:
|
|
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
|---|---|
|
Engine cannot be started |
- |
|
DTC No. | Data List and Active Test |
|---|---|
|
B2784 | Antenna Coil Status |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- If the transponder key ECU assembly is replaced, refer to Registration.
Click here
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- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. | CHECK CONNECTION OF CONNECTOR |
(a) Check that the connector is properly connected to the transponder key coil.
|
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| 2. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Immobiliser > Clear DTCs
|
| 3. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs.
Body Electrical > Immobiliser > Trouble CodesOK:
DTC B2784 is not output.
|
Result | Proceed to |
|---|---|
|
B2784 is not output | A |
|
B2784 is output | B |
| A |
.gif) | END (CONNECTOR WAS NOT CONNECTED PROPERLY) |
|
| 4. |
CHECK TRANSPONDER KEY COIL (OUTPUT) |
(a) Disconnect the transponder key coil connector.
(b) Using an oscilloscope, check the waveform.
|
*a | Front view of wire harness connector (to Transponder Key Coil) |
*b | Waveform 1 |
|
*c | Waveform 2 |
- | - |
|
Tester Connection | Condition |
Tool Setting | Specified Condition |
|---|---|---|---|
|
I64-1 (ANT1) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
20 V/DIV., 2 s./DIV. |
Pulse generation (See waveform 1) |
|
I64-5 (ANT2) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
20 V/DIV., 2 s./DIV. |
Pulse generation (See waveform 2) |
OK:
Waveform is similar to that shown in the illustration.
| OK | | REPLACE TRANSPONDER KEY COIL |
|
| 5. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL) |
(a) Disconnect the I67 transponder key ECU assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
I67-2 (ANT1) - I64-1 (ANT1) |
Always | Below 1 Ω |
|
I67-3 (ANT2) - I64-5 (ANT2) |
Always | Below 1 Ω |
|
I67-2 (ANT1) or I64-1 (ANT1) - Other terminals and body ground |
Always | 10 kΩ or higher |
|
I67-3 (ANT2) or I64-5 (ANT2) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK | | REPLACE TRANSPONDER KEY ECU ASSEMBLY
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.*1
*1: w/ Smart Key System
When replacing the combination meter assembly, always replace it with a new one. If a combination
