THEFT DETERRENT / KEYLESS ENTRY IMMOBILISER SYSTEM(w/o Smart Entry and Start System) B2784 Antenna Coil Open / Short
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. | ·
Wire harness or connector ·
Transponder key coil ·
Transponder key ECU assembly |
DTC Output Confirmation Operation:
Insert the door control transmitter assembly into the ignition key cylinder. |
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 Service Bulletin.
·After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
Clear the DTCs.
- Body Electrical > Immobiliser > Clear DTCs
- 50002 260
- Result:
Proceed to NEXT
NEXT
Perform "DTC Output Confirmation Operation" procedure.
Check for DTCs.
- Body Electrical > Immobiliser > Trouble Codes
- 50001 260
- OK:
DTC B2784 is not output.
- Result:
Result Proceed to B2784 is not output A B2784 is output B
A
Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING
B
Check that the connector is properly connected to the transponder key coil.
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Body Electrical > Immobiliser > Clear DTCs
- 50002 260
- Result:
Proceed to NEXT
NEXT
Perform "DTC Output Confirmation Operation" procedure.
Check for DTCs.
- Body Electrical > Immobiliser > Trouble Codes
- 50001 260
- OK:
DTC B2784 is not output.
- Result:
Result Proceed to B2784 is not output A B2784 is output B
A
B
Using an oscilloscope, check the waveform.
*a | Component with harness connected
(Transponder Key Coil) |
*b | Waveform 1 |
*c | Waveform 2 | - | - |
Tester Connection | Condition | Tool Setting | Specified Condition |
---|---|---|---|
E98-1 (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) |
E98-5 (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:
Proceed to OK NG
OK
NG
Temporarily replace the transponder key ECU assembly with a new one.
- HINT:
-
Refer to Service Bulletin.
- NOTICE:
-
Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Service Bulletin.
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Body Electrical > Immobiliser > Clear DTCs
- 50002 260
- Result:
Proceed to NEXT
NEXT
Perform "DTC Output Confirmation Operation" procedure.
Check for DTCs.
- Body Electrical > Immobiliser > Trouble Codes
- 50001 260
- OK:
DTC B2784 is not output.
- Result:
Result Proceed to B2784 is not output A B2784 is output B
A
B
Disconnect the E99 transponder key ECU assembly connector.
Disconnect the E98 transponder key coil connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E99-4 (ANT1) - E98-1 (ANT1) Always Below 1 Ω E99-15 (ANT2) - E98-5 (ANT2) Always Below 1 Ω E99-4 (ANT1) or E98-1 (ANT1) - Body ground Always 10 kΩ or higher E99-15 (ANT2) or E98-5 (ANT2) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG