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Seat Heater Relay > < Symptom Related Diagnostic Procedures|Page 6291
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OK:

If the temperature of the seat heater rises above the specified value, replace the seat heater assembly.

NOTE: After confirming that the seat heater's temperature is rising, immediately remove the battery leads. Failing to do so will cause the seat
heater to overheat if the thermostat is malfunctioning.

6. INSPECT FRONT SEATBACK HEATER ASSEMBLY RH

(a) Apply battery voltage and check the seatback heater.

OK:

If the result is not as specified, replace the seatback heater assembly.

NOTE: 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.

Seat Heater Relay > < Symptom Related Diagnostic Procedures|Page 6291