Seat Heater System: Inspection

1. Inspect the continuity between the terminals when the switch is operated.

   Standard: 

   SEAT HEATER SWITCH LH TERMINALS CONTINUITY
   
   

   Terminal No.	Switch Position	Specified Condition
   3 <=> 4	ON (Max.)	Continuity
   1 <=> 3	OFF	No continuity
   2 <=> 3	ON (Min.)	Continuity
   5 <=> 6	Illumination circuit	Continuity

   Fig 1: Identifying Seat Heater Switch (LH) Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the seat heater switch indicator light.
   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 light lights up.

   If the result is not as specified, replace the seat heater switch and inspect the circuits connected to the other parts.

3. 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.

Fig 2: Identifying Seat Heater Switch Illumination

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the continuity between the terminals when the switch is operated.

   Standard: 

   SEAT HEATER SWITCH (RH) TERMINALS CONTINUITY
   
   

   Terminal No.	Switch Position	Specified Condition
   3 <=> 4	ON (Max.)	Continuity
   1 <=> 3	OFF	No continuity
   2 <=> 3	ON (Min.)	Continuity
   5 <=> 6	Illumination circuit	Continuity

   Fig 3: Identifying Seat Heater Switch (RH) Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the seat heater switch indicator light.
   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 light lights up.

   If the result is not as specified, replace the seat heater switch and inspect the circuits connected to the other parts.

3. 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.

Fig 4: Identifying Seat Heater Switch Illumination

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the seatback heater continuity.

Standard: 

If continuity is not as specified, replace the seatback cover assy.

Fig 5: Identifying Front Seat Back Heater Assy (LH) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the seatback heater assembly RH continuity.

Standard: 

If continuity is not as specified, replace the seatback cover assy.

Fig 6: Identifying Front Seat Back Heater ASSY (RH) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the seat cushion heater continuity.
   1. Inspect the seat cushion heater continuity between the terminals.

   Standard: 

   FRONT SEAT CUSHION HEATER ASSY (LH) TERMINALS CONTINUITY
   
   

   Terminal No.	Condition	Specified Condition
   A-1 <=> B-2	Constant	Continuity
   A-4 <=> B-2
   A-1 <=> A-4
   A-2 <=> A-3
   B-1 <=> B-2

   If the result is not as specified, replace the seat cushion cover assy.

   Fig 7: Identifying Front Seat Cushion Heater Assy (LH) Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the seat cushion heater continuity.
   1. Inspect the seat cushion heater continuity between the terminals.

Standard: 

Fig 8: Identifying Front Seat Cushion Heater Assy (RH) Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, replace the seat cushion cover assy.