Toyota Highlander Service Manual: Inspection
1. INSPECT SEAT HEATER (FRONT) SWITCH LH
(a) Check the resistance between the terminals when the switch is operated.
Standard:
If the result is not as specified, replace the seat heater switch.
(b) Push the seat heater switch ON and check that the seat heater switch indicator illuminates.
Standard:
If the result is not as specified, replace the switch or bulb.
(c) Check that the seat heater switch indicator illuminates.
Standard:
If the result is not as specified, replace the switch or bulb.
2. INSPECT SEAT HEATER (FRONT) SWITCH RH
(a) Check the resistance between the terminals when the switch is operated.
Standard:
If the result is not as specified, replace the seat heater switch.
(b) Push the seat heater switch ON and check that the seat heater switch indicator illuminates.
Standard:
If the result is not as specified, replace the switch or bulb.
(c) Check that the seat heater switch indicator illuminates
Standard:
If the result is not as specified, replace the switch or bulb.
3. INSPECT SEAT HEATER RELAY
(a) Check the resistance of the relay.
Standard:
If the result is not as specified, replace the relay.
4. INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER LH
(a) Apply battery voltage and check the seat cushion heater.
- Check the seat cushion heater.
Standard:
If the result is not as specified, replace the seat cushion cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat.
- Check the thermostat.
(b) Apply battery voltage and check the seat cushion heater.
- Check the thermostat.
Standard:
If the temperature of the seat heater rises above the specified value, replace the seat cushion cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat
5. INSPECT SEPARATE TYPE FRONT SEAT CUSHION COVER RH
(a) Apply battery voltage and check the seat cushion heater.
- Check the seat cushion heater.
Standard:
If the result is not as specified, replace the seat cushion cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat.
(b) Apply battery voltage and check the seat cushion heater.
- Check the thermostat.
Standard:
If the temperature of the seat heater rises above the specified value, replace the seat cushion cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat.
6. INSPECT SEPARATE TYPE FRONT SEATBACK COVER
(a) Apply battery voltage and check the seatback heater.
Standard:
If the result is not as specified, replace the seatback cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat
7. INSPECT SEPARATE TYPE FRONT SEATBACK COVER
(a) Apply battery voltage and check the seat cushion heater.
Standard:
If the result is not as specified, replace the seatback cover.
NOTICE: After confirming that the seat heater is functioning normally, immediately remove the battery leads. Failing to do so will cause the seat heater to overheat.
Location
PROBLEM SYMPTOMS TABLE
Symptom
Suspected Area
Driver's and passenger's seat heaters do not warm up
SEAT HTR fuse
IG1 fuse
Seat heater relay
Wire h ...
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