Toyota Sienna Service Manual: Heater relay (for rear air conditioning system)
ON-VEHICLE INSPECTION
1. INSPECT REAR HEATER RELAY
(a) Remove the rear heater relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
If the resistance is not as specified, replace the rear heater relay.
Heater relay
ON-VEHICLE INSPECTION
1. INSPECT HEATER RELAY
(a) Remove the heater relay.
(b) Measure the resistance according to the value(s) in
the table below.
Standard resistance
If the resistance i ...
Air conditioning control assembly
COMPONENTS
...
Other materials:
For manual air conditioning system
ON-VEHICLE INSPECTION
1. INSPECT AIR INLET CONTROL SERVO MOTOR
(a) Remove the air inlet control servo motor.
(b) Connect the positive (+) lead from the battery to
terminal 5 and negative (-) lead to terminal 1, then
check that the lever turns to "RECIRCULATION"
side smoothly.
...
Dtc check / clear
1. DTC CHECK (SENSOR CHECK)
(a) After the indicator check is completed, the system
enters the DTC check mode automatically.
(b) Read the codes displayed on the panel. Refer to the
list of codes (See page AC-19) when reading the
codes. (Trouble codes are output at the temperature
display. ...
Intermediate Shaft Speed Sensor "A"
DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the
counter gear speed signal
(NC) with the direct clutch speed sensor signal (NT), the ECM detects the shift
timing of the gears and
appropriately controls the engine torque and hydraulic pressure according ...
