Sienna AWD V6-3.3L (3MZ-FE) (2004)
Seat Heater Switch: Testing and Inspection
INSPECT SEAT HEATER SWITCH LH
a. Check the resistance between the terminals when the switch is operated.
b. Inspect the seat heater switch indicator.
1. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 1.
2. Push the seat heater switch ON and check that the indicator lights up.
If the result is not as specified, replace the seat heater switch.
c. Inspect the seat heater switch illumination.
1. Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 5.
2. Check that the switch illuminates.
If the result is not as specified, replace the seat heater switch or bulb.