SEAT HEATER SYSTEM PROBLEM SYMPTOMS TABLE

Note

If the battery voltage is low, the seat heater system may not operate. In this case, check the Data List item "Battery Control Count (Body ECU)".

Tech Tips

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Seat Heater System
Symptom	Suspected Area	Link
Front seat heater does not operate (for LH)	Seat heater switch (LH side)*1	Click here
	Seat heater switch*2	Click here
	Check the thermostat	Click here
	Front seat cushion heater assembly LH	Click here
	Front seatback heater assembly LH	Click here
	Seat heater control sub-assembly LH	-
	Wire harness or connector	-
Front seat heater does not operate (for RH)	Seat heater switch (RH side)*1	Click here
	Seat heater switch*2	Click here
	Check the thermostat	Click here
	Front seat cushion heater assembly RH	Click here
	Front seatback heater assembly RH	Click here
	Seat heater control sub-assembly RH	-
	Wire harness or connector	-
Rear seat heater does not operate (for LH)*3	Check the thermostat	Click here
	Seat heater assembly (rear LH side seat cushion)	Click here
	Seat heater assembly (rear LH side seatback)	Click here
	Seat heater control sub-assembly (rear LH side seat)	-
	Seat heater switch (No. 2 air conditioning control assembly)	-
	Wire harness or connector	-
Rear seat heater does not operate (for RH)*3	Check the thermostat	Click here
	Seat heater assembly (rear RH side seat cushion)	Click here
	Seat heater assembly (rear RH side seatback)	Click here
	Seat heater control sub-assembly (rear RH side seat)	-
	Seat heater switch (No. 2 air conditioning control assembly)	-
	Wire harness or connector	-