TSB: Some 2021 model year Tacoma vehicles equipped with dual-zone automatic climate control and
without the seat heater option may have Diagnostic Trouble Codes (DTCs) B14C0 and B14C1
(Right/Left Front Seat Heater Circuit) stored in the air conditioning amplifier. The air conditioning
amplifier logic has been modified to address this condition. Follow the Repair Procedure in this
bulletin to address this condition.
