Toyota Sienna Service Manual: Rear Air Conditioning Control Panel Circuit
DESCRIPTION
This is the rear A/C system control signal circuit as well as the power supply circuit of the rear A/C control assembly.
Pulse signals regarding rear A/C control panel switch operation are transmitted between the A/C amplifier and rear A/C control assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - BATTERY)
(a) Disconnect the connector from the rear A/C control assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage
2 CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance 
3 CHECK HARNESS AND CONNECTOR (REAR A/C CONTROL ASSEMBLY - 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
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from
the MGC terminal of the A/
C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.
W ...
Rear Air Conditioning Relay Circuit
DESCRIPTION
The RR A/C relay is switched on by signals from the A/C amplifier. It
supplies power to the rear blower
motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT RELAY (RR A/C)
...
Other materials:
Inspection
1. Inspect pack clearance of reverse clutch
(A) install the intermediate shaft and needle roller
bearing onto the transaxle rear cover.
(B) using a dial indicator, measure the reverse clutch
pack clearance while applying and releasing
compressed air (392 kpa, 4.0 Kgf/cm2, 57 psi).
Pack c ...
Installation
1. INSTALL SEAT POSITION AIRBAG SENSOR
Check that the ignition switch is off.
Check that the negative battery (-) terminal is
disconnected.
CAUTION:
After disconnecting the negative battery
terminal, wait for at least 90 seconds before
starting the operation.
...
Reclining Motor Circuit
DESCRIPTION
The fold seat control ECU receives a switch operation signal from the power
rear no. 2 seat switch and
the fold seat switch, and activates the reclining motor. At this time, the Hall
IC (seatback position sensor)
detects the actuation of the seatback and sends a seatback actuation ...
