Toyota Sienna Service Manual: Push Switch / Key Unlock Warning Switch Malfunction
DTC B2780 Push Switch / Key Unlock Warning Switch Malfunction
DESCRIPTION
This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is on even when the ignition switch is on (Under the normal conditions, the unlock warning switch is on when the ignition switch is on).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|
B2780 |
Unlock warning switch on is not detected when ignition switch is on |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
- Connect the intelligent tester (with CAN VIM) to the DLC3.
- Turn the ignition switch on and turn the intelligent tester main switch on.
- Select KEY SW in the DATA LIST and read the value displayed on the intelligent tester.
Transponder key ECU:
OK: ON (Key is in ignition key cylinder) appears on the screen
2 INSPECT UNLOCK WARNING SWITCH ASSEMBLY
- Remove the unlock warning switch.
- Measure the resistance according to the value(s) in the table below.
Resistance
3 CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - UNLOCK WARNING SW ASSEMBLY)
- Disconnect the T6 ECU and K4 switch connectors.
- Measure the resistance according to the value(s) in the table below.
Resistance
4 CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SW ASSEMBLY - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Resistance
REPLACE TRANSPONDER KEY ECU ASSEMBLY
Diagnostic trouble code chart
If a trouble code is displayed during the DTC check, check
the circuit listed for that code. For details of each code, turn
the page mentioned below the "DTC No" in the DTC chart.
the & ...
Antenna Coil Open / Short
DTC B2784 Antenna Coil Open / Short
DESCRIPTION
The transponder key coil is built into the transponder key amplifier and
receives a key code signal from
the transponder chip in the key. This sign ...
Other materials:
If your vehicle has to
be stopped in an
emergency
Only in an emergency, such as if it becomes impossible to stop
the vehicle in the normal way, stop the vehicle using the following
procedure:
Steadily step on the brake pedal with both feet and firmly depress it.
Do not pump the brake pedal repeatedly as this will increase the effort
requi ...
Engine Immobiliser System Malfunction
DTC B2799 Engine Immobiliser System Malfunction
DESCRIPTION
This DTC is output when the ECM detects errors in communication between the
transponder key ECU
and the ECM, or in the communication lines. This DTC is also output when an
engine start is attempted
while the ECU communication ID bet ...
When servicing full-time 4wd vehicles
The full-time 4WD SIENNA is equipped with the open
center differential system.
If incorrect preparations or test procedures are used, the
test will not only be unsuccessful, but may be dangerous
as well.
Therefore, before beginning any such servicing or test,
be sure to check the following ...