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 and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -

Related Data List and Active Test
DTC No. Data List and Active Test
B2784 Antenna Coil Status

WIRING DIAGRAM

B329324E52
5.552,2.542 6.01,2.74 0.458,0.198 10 false E99 5.542,2.698 6.906,3.219 1.365,0.521 10 false Transponder Key ECU Assembly 1.292,3.042 1.75,3.24 0.458,0.198 10 false E98 1.281,3.188 2.75,3.49 1.469,0.302 10 false Transponder Key Coil 2.792,0.76 3.552,1.052 0.76,0.292 10 false ANT1 2.781,1.948 3.542,2.24 0.76,0.292 10 false ANT2 5.667,0.896 6.427,1.188 0.76,0.292 10 false ANT1 5.677,2.063 6.438,2.354 0.76,0.292 10 false ANT2 5.51,0.802 5.75,1.042 0.24,0.24 10 false 4 5.427,1.958 5.667,2.198 0.24,0.24 10 false 15 3.25,0.75 3.49,0.99 0.24,0.24 10 false 1 3.229,1.948 3.469,2.188 0.24,0.24 10 false 5

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

1.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Immobiliser > Clear DTCs
50002 260

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Perform "DTC Output Confirmation Operation" procedure.


b.

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

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

3.CHECK CONNECTION OF CONNECTOR
3.CHECK CONNECTION OF CONNECTOR
a.

Check that the connector is properly connected to the transponder key coil.


Result:
Proceed to
NEXT



NEXT

4.CLEAR DTC
4.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Immobiliser > Clear DTCs
50002 260

Result:
Proceed to
NEXT



NEXT

5.CHECK FOR DTC
5.CHECK FOR DTC
a.

Perform "DTC Output Confirmation Operation" procedure.


b.

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

END (CONNECTOR WAS NOT CONNECTED PROPERLY)

B

6.CHECK TRANSPONDER KEY COIL (OUTPUT)
6.CHECK TRANSPONDER KEY COIL (OUTPUT)
a.

Using an oscilloscope, check the waveform.

B329326C27
3.417,0.073 3.74,0.292 0.323,0.219 4.115,1.167 3.813,0.792 false 3.177,1.167 3.323,0.771 false 0.115,0.115 0.427,0.313 0.313,0.198 10 false *a 1,1.448 1.313,1.646 0.313,0.198 10 false *b 1,3.542 1.313,3.74 0.313,0.198 10 false *c 6.542,2.479 7.083,2.781 0.542,0.302 10 false GND 6.552,4.552 7.094,4.854 0.542,0.302 10 false GND 3.979,1.188 4.521,1.49 0.542,0.302 10 false ANT1 3.031,1.188 3.573,1.49 0.542,0.302 10 false ANT2 3.458,0.094 3.917,0.292 0.458,0.198 10 false E98
*a Component with harness connected
(Transponder Key Coil) 		*b Waveform 1
*c Waveform 2 - -


Measurement Condition
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

7.REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

10.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)
7.REPLACE TRANSPONDER KEY ECU ASSEMBLY
a.

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

8.CLEAR DTC
8.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Immobiliser > Clear DTCs
50002 260

Result:
Proceed to
NEXT



NEXT

9.CHECK FOR DTC
9.CHECK FOR DTC
a.

Perform "DTC Output Confirmation Operation" procedure.


b.

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

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

B

REPLACE TRANSPONDER KEY COIL

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>TRANSPONDER KEY AMPLIFIER>REMOVAL


10.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)
a.

Disconnect the E99 transponder key ECU assembly connector.


b.

Disconnect the E98 transponder key coil connector.


c.

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

7.REPLACE TRANSPONDER KEY ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR