Dtc B2784 Antenna Coil Open / Short
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (TRANSPONDER KEY COIL)
CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
DTC B2784 Antenna Coil Open / Short |
DESCRIPTION
The transponder key coil receives key code signals from the key's transponder chip. The coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU.DTC No.
| DTC Detection Condition
| Trouble Area
|
B2784
| Antenna coil open / short
| - Wire harness
- Transponder key amplifier
- Transponder key ECU
|
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (TRANSPONDER KEY COIL) |
Check the Data List for proper functioning of the transponder key coil.
Transponder key ECUItem
| Measurement Item / Display (Range)
| Normal Condition
| Diagnostic Note
|
Antenna Coil Status
| Transponder key coil condition / NORMAL or FAIL
| NORMAL: Transponder key coil is normal
FAIL: Transponder key coil is malfunctioning
| -
|
- OK:
- NORMAL (transponder key coil is normal) appears on screen.
| | REPLACE TRANSPONDER KEY ECU |
|
|
| 2.CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) |
Disconnect the T21 ECU connector.
Disconnect the T20 amplifier connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
T21-14 (VC5) - T20-1 (VC5)
| Below 1 Ω
|
T21-15 (CODE) - T20-4 (CODE)
|
T21-4 (TXCT) - T20-5 (TXCT)
|
T21-5 (AGND) - T20-7 (AGND)
|
T21-14 (VC5) or T20-1 (VC5) - Body ground
| 10 kΩ or higher
|
T21-15 (CODE) or T20-4 (CODE) - Body ground
|
T21-4 (TXCT) or T20-5 (TXCT) - Body ground
|
T21-5 (AGND) or T20-7 (AGND) - Body ground
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK |
|
|
|
| REPLACE TRANSPONDER KEY AMPLIFIER |
|
