DTC B14C1: Front Left Seat Heat Sensor Circuit [06/2017 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [06/2017 - ]

   Body Electrical > Air Conditioner > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [06/2017 - ]

   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 [06/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 03/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2020 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 08/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2021 - ] 

Result: 

NG 

See step  3

1. Disconnect the b9 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
   b9-4 (THL) - b9-5 (PL)	Seat heater temperature 23°C (73°F)	4.1 to 5.0 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH 

for Power Seat: Refer to REMOVAL [06/2017 - 10/2020] , or refer to REMOVAL [10/2020 - ]

Result: 

OK 

See step  4

1. Disconnect the b9 front seat cushion heater assembly LH connector.
2. Disconnect the K55 and K56 air conditioning amplifier assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K56-17 (TSL) - b9-4 (THL)	Always	Below 1 Ω
   K56-17 (TSL) or b9-4 (THL) - Body ground	Always	10 kΩ or higher
   K55-8 (SG-5) - b9-5 (PL)	Always	Below 1 Ω
   K55-8 (SG-5) or b9-5 (PL) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR