Toyota Sienna Service Manual: Rear Air Mix Damper Position Sensor Circuit
DESCRIPTION
This sensor detects the position of the rear air mix control servo motor (water valve servo motor) and sends the appropriate signals to the A/C amplifier. The position sensor is built in the rear air mix control servo motor (water valve servo motor).
The position sensor's resistance changes as the rear air mix control servo motor valve moves.
It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resistor, and then to the A/ C amplifier.
The A/C amplifier determines the valve position based on the input voltage from
the position sensor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
(c) Select the items below in the DATA LIST, and read the display on the intelligent tester.
DATA LIST / AIR CONDITIONER 
OK: The display is as specified in the normal condition column.
Result 
2 INSPECT REAR AIR MIX CONTROL SERVO MOTOR (WATER VALVE SERVO MOTOR)
(a) Remove the rear air mix control servo motor (water valve servo motor).
(b) Disconnect the connector from the rear air mix control servo motor (water valve servo motor).
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance
(d) Measure the resistance according to the value(s) in the table below.
HINT
- In order to turn the motor to the "MAX. COOL" position, connect the positive (+) lead to terminal 5, and the negative (-) lead to terminal 4.
- In order to turn the motor to the "MAX. HOT" position, connect the positive (+) lead to terminal 4, and the negative (-) lead to terminal 5.
Standard resistance 
(e) As the rear air mix control servo motor (water valve servo motor) moves from the cool side to the hot side, the resistance decreases gradually without interruption.
3 CHECK HARNESS AND CONNECTOR (REAR AIR MIX CONTROL SERVO MOTOR - A/C AMPLIFIER)
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
REPLACE A/C AMPLIFIER
Air Mix Damper Position Sensor Circuit (Driver Side)
DESCRIPTION
This sensor detects the position of the air mix control servo motor (air
outlet damper) and sends the
appropriate signals to the A/C amplifier. The position sensor is built in the ...
Rear Air Outlet Damper Position Sensor Circuit
DESCRIPTION
This sensor detects the position of the rear air outlet control servo motor
and sends the appropriate
signals to the A/C amplifier. The position sensor is built in the rear air
o ...
Other materials:
Occupant Classification ECU Malfunction
DTC B1795 Occupant Classification ECU Malfunction
DESCRIPTION
DTC B1795 is recorded when a malfunction is detected in the occupant
classification ECU.
Troubleshoot DTC B1771 first when the DTCs B1771 and B1795 are output
simultaneously.
DTC No.
DTC Detecting Condition
...
Erasing the entire HomeLink® memory (all three programs)
Press and hold down the 2 outside
buttons for 10 seconds until
the indicator light flashes.
If you sell your vehicle, be sure to
erase the programs stored in the
HomeLink® memory.
Before programming
Install a new battery in the transmitter.
The battery side of the transmitter must ...
Turning on the high beam headlights
With the headlights on, push
the lever away from you to turn
on the high beams.
When the light switch is in
position, the Automatic High Beam
system will be activated.
Pull the lever toward you to the
center position to turn the high
beams off.
Pull the lever toward you and ...
