THEFT DETERRENT / KEYLESS ENTRY IMMOBILISER SYSTEM(w/ Smart Entry and Start System) B2784 Antenna Coil Open / Short
DESCRIPTION
When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a past DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B2784 | Antenna Coil Open / Short | The transponder key amplifier coil built into the engine switch is open (see below) or shorted (determined by communication with certification ECU (smart key ECU assembly)) (1 trip detection logic*1).
·
Terminal AGND, VC5, TXCT or CODE circuit is open (includes disconnection of the engine switch). ·
The transponder key amplifier coil built into the engine switch is open. |
·
Engine switch ·
Wire harness or connector ·
Certification ECU (smart key ECU assembly) |
DTC output confirmation operation:
With the shift lever in P*2 and the electrical key transmitter sub-assembly held near the engine switch, an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted. |
*1: Only output while a malfunction is present.
*2: except Manual Transaxle
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
| Engine cannot be started when transmitter battery is depleted by holding electrical key transmitter sub-assembly near engine switch and pressing and holding engine switch with shift lever in P*. | - |
*: except Manual Transaxle
| DTC No. | Data List and Active Test |
|---|---|
| B2784 | - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
·Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.
·After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
Disconnect the E110 certification ECU (smart key ECU assembly) connector.
Disconnect the E111 engine switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E110-7 (CODE) - E111-8 (CODE) Always Below 1 Ω E110-9 (TXCT) - E111-7 (TXCT) Always Below 1 Ω E110-1 (VC5) - E111-10 (VC5) Always Below 1 Ω E110-24 (AGND) - E111-6 (AGND) Always Below 1 Ω E111-8 (CODE) - Body ground Always 10 kΩ or higher E110-7 (CODE) - Body ground Always 10 kΩ or higher E111-7 (TXCT) - Body ground Always 10 kΩ or higher E110-9 (TXCT) - Body ground Always 10 kΩ or higher E111-10 (VC5) - Body ground Always 10 kΩ or higher E110-1 (VC5) - Body ground Always 10 kΩ or higher E111-6 (AGND) - Body ground Always 10 kΩ or higher E110-24 (AGND) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
Temporarily replace the engine switch with a new or known good one.
Click hereEngine / Hybrid System>2ZR-FE STARTING>ENGINE SWITCH>REMOVAL
- Result:
Proceed to NEXT
NEXT
Clear the DTCs.
- Body Electrical > Entry&Start > Clear DTCs
- 50002 125
- Result:
Proceed to NEXT
NEXT
Perform "DTC Output Confirmation Operation" procedure.
Check for DTCs.
- Body Electrical > Entry&Start > Trouble Codes
- 50001 125
- OK:
DTC B2784 is not output.
- Result:
Proceed to OK NG
OK
NG