Toyota Sienna Service Manual: System description
1. MULTIPLEX COMMUNICATION SYSTEM (BEAN)
- The BEAN communication line is used to control the
combination meter, the A/C amplifier, the airbag
sensor assembly, the multiplex network body ECU,
the power slide door ECU LH, the power slide door
ECU RH, the power back door ECU, the seat
position control ECU, the outer mirror control ECU
LH, and the outer mirror ECU RH. If there is a shortcircuit
(bus-down) in the line, the communication to
the system that has a short-circuit (bus-down) will
be disabled and the DTC concerning the system will
be output from the multiplex network gateway ECU.


- If the DTC of ECU communication stop is output,
connectors may be disconnected, or communication
buses may be open at 2 points. It will not become
abnormal with only 1 communication bus open.

- If 2 communication buses are open at the points
shown in the illustration, the DTC of ECU
communication stop between those 2 buses is
output.
2. CHECK COMMUNICATION FUNCTION
- Check the battery voltage.
Standard voltage:
11 to 14 V
- Inspect the DTC output.
- Check a DTC concerning the multiplex network
body ECU by connecting the intelligent tester to
the DLC3 and turning the ignition switch to the
ON position.
- When the display shows DTCs concerning the
ECU unconnected and the communication bus
defective, perform the inspection depending on
the troubleshooting procedures.
HINT:
When another DTC is output, refer to the DTC
table and check the applicable section.
HINT:
Troubleshoot in accordance with the procedures on the
following pages.
1 VEHICLE BROUGHT TO WORKSHOP
2 DTC CHECK
Check for DTCs and make a note of the code that is
output (See page MP- ...
Other materials:
Entire Combination Meter does not Operate
DESCRIPTION
This is the power source circuit to operate the combination meter assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT COMBINATION METER ASSEMBLY
Disconnect the C10 connector.
Measure the resistance according to the value(s) in the
table below.
Standard resistan ...
Open in Rear Curtain Shield Squib LH Circuit
DTC B1636/88 Open in Rear Curtain Shield Squib LH Circuit
DESCRIPTION
The rear curtain shield squib LH circuit consists of the center airbag sensor
assembly and the curtain
shield airbag assembly LH.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1636/88 ...
Installation
1. INSTALL TIRE PRESSURE WARNING VALVE AND TRANSMITTER
(a) Insert the tire pressure warning valve and
transmitter into the valve installation hole. Insert it
from the inside of the rim so that the printed surface
can be seen.
NOTICE:
Check that there is no visible deformation,
damage, ...