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:
Removal
1. DRAIN ENGINE COOLANT
2. REMOVE V-BANK COVER SUB-ASSEMBLY
3. REMOVE NO. 2 AIR CLEANER INLET
4. REMOVE NO. 1 AIR CLEANER INLET
5. REMOVE AIR CLEANER CAP SUB-ASSEMBLY
6. REMOVE AIR CLEANER CASE SUB-ASSEMBLY
7. REMOVE ENGINE COOLANT TEMPERATURE SENSOR
Remove the engine coolant tem ...
Rear Occupant Classification Sensor LH Circuit
Malfunction
DTC B1782 Rear Occupant Classification Sensor LH Circuit
Malfunction
DESCRIPTION
The rear occupant classification sensor LH circuit consists of the occupant
classification ECU and the rear
occupant classification sensor LH.
DTC B1782 is recorded when a malfunction is detected in the rear oc ...
Operation check
1. INPUT SIGNAL CHECK
Connect the intelligent tester to the DLC3.
Check the cruise control main switch using the
DATA LIST function in the intelligent tester (ONOFF,
CANCEL, - (COAST)/SET, + (ACCEL)/RES
(RESUME), and MODE).
2. INSPECT MODE SWITCH
Turn the ...
