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. |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
|---|---|---|---|
|
B2784 |
The antenna coil in the transponder key coil is open/shorted. |
|
Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds. |
|
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
(See page
.gif)
). - After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
.gif)
|
2. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
Result|
Result |
Proceed to |
|---|---|
|
DTC B2784 is output |
A |
|
DTC B2784 is not output |
B |
| B | .gif) |
USE SIMULATION METHOD TO CHECK |
|
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connector is properly connected to the transponder key coil.
|
|
4. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
|
5. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs. (See page ).
OK:
DTC B2784 is not output.
Result|
Result |
Proceed to |
|---|---|
|
DTC B2784 is not output |
A |
|
DTC B2784 is output |
B |
| A | |
END (CONNECTOR WAS NOT CONNECTED PROPERLY) |
|
|
6. |
CHECK TRANSPONDER KEY COIL (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
Text in Illustration
|
*a |
Component with harness connected (Transponder Key Coil) |
*b |
Waveform 1 |
|
*c |
Waveform 2 |
- |
- |
Measurement Condition:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
T9-1 (ANT1) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 1) |
|
T9-5 (ANT2) - Body ground |
Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder |
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform 2) |
OK:
Waveform is similar to that shown in the illustration.
Result|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK |
B |
| B | |
REPLACE TRANSPONDER KEY COIL |
|
|
7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL) |
(a) Disconnect the T10 transponder key ECU assembly connector.
(b) Disconnect the T9 transponder key coil connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T10-4 (ANT1) - T9-1 (ANT1) |
Always |
Below 1 Ω |
|
T10-15 (ANT2) - T9-5 (ANT2) |
Always |
Below 1 Ω |
|
T10-4 (ANT1) or T9-1 (ANT1) - Body ground |
Always |
10 kΩ or higher |
|
T10-15 (ANT2) or T9-5 (ANT2) - Body ground |
Always |
10 kΩ or higher |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly with a new one (See page
).
NOTICE:
Key ID code registration is necessary when replacing the transponder key ECU
assembly, refer to Registration (See page ).
|
|
9. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
|
10. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
Result|
Result |
Proceed to |
|---|---|
|
DTC B2784 is not output |
A |
|
DTC B2784 is output |
B |
| A | |
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) |
| B | |
REPLACE TRANSPONDER KEY COIL |
