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 |
Any of the following conditions is met:
|
|
|
Vehicle Condition |
|||
---|---|---|---|
Pattern 1 |
Pattern 2 |
||
Diagnosis Condition |
Always |
○ |
○ |
Malfunction Status |
The antenna coil in the transponder key coil is open. |
○ |
- |
The antenna coil in the transponder key coil is shorted. |
- |
○ |
|
Detection Time |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started |
- |
DTC No. |
Data List and Active Test |
---|---|
B2784 |
Antenna Coil Status |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Immobiliser > Clear DTCs
|
2. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Immobiliser > Trouble CodesHINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B2784 is not output.
Result |
Proceed to |
---|---|
B2784 is not output |
A |
B2784 is output |
B |
A | ![]() |
USE SIMULATION METHOD TO CHECK |
|
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.
Body Electrical > Immobiliser > Clear DTCs
|
5. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Immobiliser > Trouble CodesHINT:
Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure.
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) |
|
6. |
CHECK TRANSPONDER KEY COIL (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
*a |
Component with harness connected (Transponder Key Coil) |
*b |
Waveform 1 |
*c |
Waveform 2 |
- |
- |
Item |
Content |
---|---|
Tester Connection |
F79-1 (ANT1) ←→ Body ground |
Tool Setting |
20 V/DIV., 2 s./DIV. |
Condition |
Within 3 seconds of inserting key into ignition key cylinder |
Item |
Content |
---|---|
Tester Connection |
F79-5 (ANT2) ←→ Body ground |
Tool Setting |
20 V/DIV., 2 s./DIV. |
Tool Setting |
Within 3 seconds of inserting key into ignition key cylinder |
OK:
Waveform is similar to that shown in the illustration
OK | ![]() |
REPLACE TRANSPONDER KEY COIL |
|
7. |
CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL AND BODY GROUND) |
(a) Disconnect the F22 transponder key ECU assembly connector.
(b) Disconnect the F79 transponder key coil connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F22-4 (ANT1) - F79-1 (ANT1) |
Always |
Below 1 Ω |
F22-15 (ANT2) - F79-5 (ANT2) |
Always |
Below 1 Ω |
F22-4 (ANT1) - Body ground |
Always |
10 kΩ or higher |
F79-1 (ANT1) - Body ground |
Always |
10 kΩ or higher |
F22-15 (ANT2) - Body ground |
Always |
10 kΩ or higher |
F79-5 (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.
Click here
HINT:
Refer to Registration.
Click here
NOTICE:
Key ID code registration is necessary when replacing the transponder key ECU assembly.
Click here
|
9. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Immobiliser > Clear DTCs
|
10. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Immobiliser > Trouble CodesHINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B2784 is not output.
Result |
Proceed to |
---|---|
B2784 is not output |
A |
B2784 is output |
B |
A | ![]() |
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE) |
B | ![]() |
REPLACE TRANSPONDER KEY COIL |
Toyota CH-R Service Manual > Wireless Door Lock Control System(w/ Smart Key System): Precaution
PRECAUTION
PRECAUTIONS WHEN USING Techstream
(a) When using the Techstream with the engine 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
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Toyota CH-R Service Manual > Exterior Panels / Trim: Wheel Opening Moulding(for Front)
Components
COMPONENTS
ILLUSTRATION
*1
FRONT FENDER MOULDING SUB-ASSEMBLY
-
-
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
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