Toyota Sienna Service Manual: Multiplex Communication Circuit
DESCRIPTION 
INSPECTION PROCEDURE
1 GO TO CAN COMMUNICATION SYSTEM
(a) Refer to the CAN communication system (See page CA- 7).
(b) If the CAN communication system is operating normally, proceed to the next step.
2 GO TO MULTIPLEX COMMUNICATION SYSTEM (BEAN)
(a) Refer to the multiplex communication system (See page MP-4).
END
Compressor Solenoid Circuit
DESCRIPTION
In this circuit, the compressor receives a refrigerant compression demand
signal from the A/C amplifier.
Based on this signal, the compressor changes the amount of compressor output. ...
Blower Motor Circuit
DESCRIPTION
The blower motor is operated by signals from the A/C amplifier. Blower motor
speed signals are
transmitted by changes in the Duty Ratio.
Duty Ratio
The duty ratio is the ratio of ...
Other materials:
Short to GND in Rear Curtain Shield Squib LH
Circuit
DTC B1637/85 Short to GND 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 ...
Starting the engine
Check that the parking brake is set.
Check that the shift lever is set in P.
Firmly depress the brake pedal.
The engine switch indicator will turn green. If the indicator does not turn
green, the engine cannot be started.
Press the engine switch.
The engine will crank until it sta ...
Speedometer Malfunction
DESCRIPTION
Factors that affect the indicated vehicle speed include tire size, tire
inflation, and tire wear. The speed indicated on the speedometer has an
allowable margin of error. This can be tested using a speedometer tester
(calibrated chassis dynamometer). For details about testing and ...
