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 Code |
DTC Detection Condition |
Trouble Area |
DTC Output Confirmation Operation |
---|---|---|---|
B2784 |
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*).
|
|
With the shift lever in P, the key held near the engine switch and an engine start operation is performed by pressing and holding the engine switch when the key battery is depleted. |
Vehicle Condition when Malfunction Detected |
Fail-safe Operation when Malfunction Detected |
---|---|
Engine cannot be started when key battery is depleted by holding key near engine switch and pressing and holding engine switch with shift lever in P |
- |
DTC Code |
Data List and Active Test |
---|---|
B2784 |
- |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
2. |
CHECK DTC OUTPUT |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK ENGINE SWITCH (OUTPUT) |
(a) Using an oscilloscope, check the waveform.
*a |
Component with harness connected (Engine Switch) |
*b |
Waveform |
*c |
Waveform (detail) |
- |
- |
Measurement Condition:
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
---|---|---|---|
E28-8 (CODE) - E28-6 (AGND) |
Engine switch off, engine switch pressed with key held near engine switch* |
1 V/DIV., 20 ms./DIV. |
Pulse generation (See waveform) |
2 V/DIV., 100 μs./DIV. |
Pulse generation (See waveform (detail)) |
OK:
The waveform is similar to that shown in the illustration
NG | ![]() |
REPLACE ENGINE SWITCH |
|
4. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly) with a new one (See
page ).
|
5. |
REGISTER RECOGNITION CODE |
(a) Register the key (See page ).
|
6. |
REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID (See page
).
|
7. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
8. |
CHECK FOR DTC |
(a) Perform "DTC Output Confirmation Operation" procedure.
(b) Check for DTCs (See page ).
OK:
DTC B2784 is not output.
OK | ![]() |
END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) |
NG | ![]() |
REPLACE ENGINE SWITCH |
FCM Destination Information Unmatched (C1AA1)
DESCRIPTION
When the forward recognition camera is replaced with a new one, the new forward
recognition camera attempts to store country specification information received
from the main body ECU (multiplex network body ECU) and ECM. If the country specification
information stored in the forwa ...
Sliding Roof ECU Communication Stop (B1273)
DESCRIPTION
This DTC is stored when LIN communication between the sliding roof ECU (sliding
roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) stops
for 10 seconds or more.
DTC No.
DTC Detection Condition
Trouble Area
...
Front Door Courtesy Switch
Inspection
INSPECTION
PROCEDURE
1. INSPECT FRONT DOOR COURTESY SWITCH
(a) Check the resistance.
(1) Measure the resistance using an ohmmeter, and check the results in accordance
with the value( s) in the table below.
Standard:
Tester Connection
Condition
...