- Wire harness or connector
- Transponder key coil
- Transponder key ECU assembly
| Last Modified: 08-28-2024 | 6.11:8.1.0 | Doc ID: RM100000000VJL3 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/o Smart Key System): B2784; Antenna Coil Open / Short; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B2784 |
Antenna Coil Open / Short |
DESCRIPTION
When an open or short circuit is detected in the transponder key coil, the transponder key ECU assembly stores this DTC.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2784 |
The transponder key coil is open or shorted. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
If the transponder key ECU assembly is replaced, refer to Registration (See page
![2016 - 2020 MY Sienna [12/2015 - ]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/o Smart Key System): REGISTRATION](/t3Portal/stylegraphics/info.gif)
).
- After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs (See page
).
|
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page
).
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B2784 is not output.
| OK |
|
USE SIMULATION METHOD TO CHECK (See page
|
|
|
3. |
CHECK CONNECTION OF CONNECTOR |
(a) Check that the connectors are properly connected to the transponder key coil.
|
|
4. |
CLEAR DTC |
(a) Clear the DTCs (See page
).
|
|
5. |
CHECK FOR DTC |
(a) Check for DTCs (See page
).
HINT:
Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure.
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) |
|
|
6. |
CHECK TRANSPONDER KEY COIL (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
Text in Illustration
|
*a |
Component with harness connected (Transponder Key Coil) |
*b |
Waveform 1 |
|
*c |
Waveform 2 |
- |
- |
Waveform 1
|
Item |
Content |
|---|---|
|
Tester Connection |
D148-1 (ANT1) - Body ground |
|
Tool Setting |
20 V/DIV., 2 s./DIV. |
|
Condition |
Within 3 seconds of inserting key into ignition key cylinder |
Waveform 2
|
Item |
Content |
|---|---|
|
Tester Connection |
F148-5 (ANT2) - Body ground |
|
Tool Setting |
20 V/DIV., 2 s./DIV. |
|
Condition |
Within 3 seconds of inserting key into ignition key cylinder |
OK:
Waveform is similar to that shown in the illustration
| OK |
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL AND BODY GROUND) |
(a) Disconnect the D151 transponder key ECU assembly connector.
(b) Disconnect the D148 transponder key coil connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D151-4 (ANT1) - D148-1 (ANT1) |
Always |
Below 1 Ω |
|
D151-15 (ANT2) - D148-5 (ANT2) |
Always |
Below 1 Ω |
|
D151-4 (ANT1) or D148-1 (ANT1) - Body ground |
Always |
10 kΩ or higher |
|
D151-15 (ANT2) or D148-5 (ANT2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
REPLACE TRANSPONDER KEY ECU ASSEMBLY |
(a) Replace the transponder key ECU assembly with a new one (See page
).
NOTICE:
Key ID code registration is necessary when replacing the transponder key ECU assembly. Refer to Registration (See page
).
|
|
9. |
CLEAR DTC |
(a) Clear the DTCs (See page
).
|
|
10. |
CHECK FOR DTC |
(a) Check for DTCs (See page
).
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
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 |
|
|
|