Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM10000000294YW |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 -
] |
Title: THEFT DETERRENT / KEYLESS ENTRY: IMMOBILISER SYSTEM (w/o Smart Key System): B2784; Antenna Coil Open / Short; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - ] |
DTC
|
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
|
-
Hybrid control system cannot be started*1
-
Engine cannot be started*2
|
-
|
-
*1: for HV Model
-
*2: for Gasoline Model
Related Data List and Active Test
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
-
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.
NEXT
|
|
|
(a) Clear the DTCs.
Body Electrical > Immobiliser > Clear DTCs
NEXT
|
|
|
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs.
Body Electrical > Immobiliser > Trouble Codes
OK:
DTC B2784 is not output.
Result
|
Proceed to
|
B2784 is not output
|
A
|
B2784 is output
|
B
|
A |
|
END (CONNECTOR WAS NOT CONNECTED PROPERLY)
|
B
|
|
|
4.
|
CHECK TRANSPONDER KEY COIL (OUTPUT)
|
(a) Disconnect the I64 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
|
-
|
-
|
OK
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.
NG
|
|
|
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|