DTC B14C1: Front Left Seat Heat Sensor Circuit [04/2018 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [04/2018 - ]

   Body Electrical > Air Conditioner > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [04/2018 - ]

   Body Electrical > Air Conditioner > Trouble Codes 

   OK

   DTC B14C1 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 - ] 

Result: 

NG 

See step  3

1. Disconnect the R26 front seat cushion heater assembly LH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R26-4 (THL) - R26-5 (PL)	Seat heater temperature 25°C (77°F)	9.5 to 10.5 kΩ

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Front Seat Cushion Heater Assembly LH)

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH 

for Power Seat: Refer to REMOVAL [04/2018 - 08/2020] , or refer to REMOVAL [08/2020 - 08/2021] , or refer to REMOVAL [08/2021 - ]

Result: 

OK 

See step  4

1. Disconnect the G36 and G37 air conditioning amplifier assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G37-17 (TSL) - R26-4 (THL)	Always	Below 1 Ω
   G37-17 (TSL) or R26-4 (THL) - Body ground	Always	10 kΩ or higher
   G36-8 (SG-5) - R26-5 (PL)	Always	Below 1 Ω
   G36-8 (SG-5) or R26-5 (PL) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR