| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001B2OB |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B2784; Antenna Coil Open / Short; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
|
DTC |
B2784 |
Antenna Coil Open / Short |
DESCRIPTION
When an open or short circuit is detected in the transponder key amplifier coil built into the power switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a history DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|
|
B2784 |
Antenna Coil Open / Short |
The transponder key amplifier coil built into the power switch is open (see below) or shorted (determined by communication with certification ECU (smart key ECU assembly)). (1 trip detection logic*) |
|
DTC output confirmation operation:
|
- *: Only output while a malfunction is present.
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 when transmitter battery is depleted by holding electrical key transmitter sub-assembly near power switch and pressing and holding power switch with shift lever in P |
- |
Related Data List and Active Test
|
DTC No. |
Data List and Active Test |
|---|---|
|
B2784 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
-
The smart key system (for Start Function, HV Model) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function, HV Model) after confirming that the communication systems are functioning properly.
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![2019 - 2022 MY Avalon HV [04/2018 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
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Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
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- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
|
2. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
OK:
DTC B2784 is not output.
| OK |
|
|
|
3. |
CHECK POWER SWITCH (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Power Switch) |
*b |
Waveform |
|
*c |
Waveform (detail) |
- |
- |
OK:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
G117-8 (CODE) - G117-6 (AGND) |
Power switch off, power switch pressed with electrical key transmitter sub-assembly held near power switch* |
1 V/DIV., 20 ms./DIV. |
Pulse generation (See waveform) |
|
2 V/DIV., 100 μs./DIV. |
Pulse generation (See waveform (detail)) |
- *: Remove the transmitter battery before performing this inspection.
OK:
The waveform is similar to that shown in the illustration.
| OK |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
| NG |
|
REPLACE POWER SWITCH
|
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