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.
![MULTIPLEX COMMUNICATION SYSTEM](images/books/424/92/index449.jpg)
![MULTIPLEX COMMUNICATION SYSTEM](images/books/424/92/index450.jpg)
- 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.
![MULTIPLEX COMMUNICATION SYSTEM](images/books/424/92/index451.jpg)
- 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:
DTC check / clear
1. USING INTELLIGENT TESTER
Hook up the intelligent tester to the DLC3.
Monitor the ECU data by following the prompts on
the tester screen.
HINT:
intelligent tester has "Snapshot" function which
records the monitored data. Please refer to the
intelligent tester op ...
Disposal
1. DISPOSE OF SHOCK ABSORBER ASSEMBLY REAR LH
(a) Fully extend the shock absorber rod.
(b) Using a drill, make a hole in the cylinder as shown in
the illustration to discharge the gas inside the
cylinder.
CAUTION:
When drilling, since the fragments may fly
out, work careful ...
Removal
1. DISCONNECT BATTERY NEGATIVE TERMINAL
2. REMOVE FRONT DOOR SCUFF PLATE LH
3. REMOVE COWL SIDE TRIM BOARD LH
4. REMOVE INSTRUMENT PANEL FINISH PANEL SUBASSEMBLY
LOWER LH (See page IP-6)
5. REMOVE REAR DOOR SCUFF PLATE RH
6. REMOVE REAR DOOR SCUFF PLATE LH
7. REMOVE FRONT SEAT ASSEMBLY LH
HI ...