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:
TRAC OFF Indicator Light Remains ON
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and
multiplex communications.
When the traction OFF switch is turned on, the TRAC OFF indicator light will
come on (for 2WD model).
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actu ...
Identification of noise source
1. Radio Description
Radio frequency band
Radio broadcasts use the radio frequency bands
shown in the table below.
Service area
The service areas of AM and FM broadcasts are
vastly different. Sometimes an AM broadcast
can be received very clearly ...
Removal
1. BOLT, SCREW AND NUT TABLE
The bolts, the screws and the nuts, which are
necessary for installation and removal of the
instrument panel are shown in the illustration below
with alphabets.
2. DISCONNECT BATTERY NEGATIVE TERMINAL
3. REMOVE STEERING WHEEL COVER LOWER NO.2
4. ...
