Description & Operation

Sienna models use 4-brush, solenoid-actuated, reduction gear type starters, equipped with overrunning clutches. The brush holder assembly retains 4 brushes and springs in the starter housing.

Reduction gear type starters contain an integral solenoid attached to drive housing, a reduction idler gear and bearing installed into starter housing, and a clutch drive assembly. The clutch drive assembly is mounted to starter housing and is driven by the reduction idler gear from armature shaft. The brush holder assembly retains 4 brushes and 4 springs in the end cover of field frame housing.

Sienna uses a starter relay to energize starter. It also uses a park/neutral position switch on the starter relay power circuit. If equipped with an engine immobilizer system, the engine immobilizer system ECU monitors the park/neutral position switch and starter relay voltage.