Sienna LE V6-3.0L (1MZ-FE) (1998)
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Location Of Splice Points (Fig 44)
System Outline
FAN MOTOR OPERATION
With the ignition SW turned ON, the current through the HEATER fuse flows to the FAN NO. 3 relay (Coil side), TERMINAL 2 of the A/C single
pressure SW, TERMINAL 2 of the water temp. SW no.1 and MAIN NO. 2 relay (Coil side).
1. LOW SPEED OPERATION
Only when the A/C system is activated or the water temp. SW no.2 is turned ON. the A/C condenser fan motor and the radiator fan motor rotates
at low speed.
When the A/C system is activated, the current from HEATER fuse flows to the FAN NO. 3 relay (Coil side) to TERMINAL 13 of the A/C
amplifier, causing the FAN NO. 3 relay to turn ON. As a result. the current through the CDS fuse flows to TERMINAL 2 of the A/C condenser
fan motor to TERMINAL 1 to TERMINAL 3 of the FAN NO. 2 relay to TERMINAL 4 to TERMINAL 3 of the FAN NO. 3 relay to
TERMINAL 5 to TERMINAL 2 of the radiator fan motor to TERMINAL 1 to GROUND. As the current flows to the motors in series. the
motors rotate at low speed.
When the water temp. SW no.2 is turned ON, the current from HEATER fuse flows to the FAN NO. 3 relay (Coil side) to TERMINAL 1 to the
water temp. SW no.2 to GROUND, causing the FAN NO. 3 relay to turn ON. As a result, the current through the CDS fuse flows through the
same route as above, rotating the motors at low speed.
2. HIGH SPEED OPERATION
Only when the A/C single pressure SW is turned ON or the water temp. SW no.1 is turned ON, the A/C condenser fan motor and the radiator fan
motor rotate at high speed.
When the A/C single pressure SW is turned ON or the water temp. SW no.1 is turned ON, the current from the RD fuse flows to the FAN NO. 1
relay (Point side) to TERMINAL 2 of the radiator fan motor to TERMINAL 1 to GROUND. At the same time, the current from the CDS fuse
flows to TERMINAL 2 of the A/C condenser fan motor to TERMINAL 1 to TERMINAL 3 of the FAN NO.2 relay to TERMINAL 5 to
GROUND.
As the current to the motors flow in parallel as above, the motors rotate at high speed.
