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:
Headlight leveling switch
ON-VEHICLE INSPECTION
1. HEADLIGHT LEVELING SWITCH
Connect the battery positive (+) lead to the terminal
1 and the battery negative (-) lead to the terminal 5.
Measure the resistance between the terminal 4 and
the battery negative (-) lead when headlight leveling
switch ...
Terminals of ECU
1. CHECK OUTER MIRROR CONTROL ECU LH
Disconnect the O9 and O10 connectors.
Measure the voltage and resistance according to
the value(s) in the table below.
Voltage
Resistance
If the result is not as specified, there may be a
malfunction on the wire harness side.
Recon ...
Linked mirror function when reversing (if equipped)
When the mirror select switch is in the L or R position, the outside rear
view mirrors will automatically angle downwards when the vehicle is
reversing in order to give a better view of the ground.
To disable this function, move the mirror select switch to the neutral
position (between L and R ...
