DTC B14C1: Front Left Seat Heat Sensor Circuit [10/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR [10/2013 - ] .
NEXT: Go to next step
CHECK FOR DTC
1. Check for DTCs. Refer to DTC CHECK / CLEAR [10/2013 - ] .
  OK
  
  DTC B14C1 is not output.
NG → See step 3

OK → See step 7
INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH
1. Remove the front seat cushion heater assembly LH. Refer to REMOVAL [10/2013 - ] .
2. Inspect the front seat cushion heater assembly LH. Refer to INSPECTION [10/2013 - ] .
NG → See step 8

OK: Go to next step

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)

Disconnect the D63 air conditioning amplifier assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
D63-4 (TSL) - S12-2	Always	Below 1 Ω
D63-23 (SGND) - S12-4	Always	Below 1 Ω
D63-4 (TSL) - Body ground	Always	10 kΩ or higher
D63-23 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH
1. Replace the seat heater control sub-assembly LH. Refer to DISASSEMBLY [10/2013 - ] .
NEXT: Go to next step
CHECK FRONT SEAT HEATER OPERATION
1. Check that the front seat heater. Refer to OPERATION CHECK [10/2013 - ] .
  OK
  
  The front seat heater operates normally.
NG → See step 9

OK → END (SEAT HEATER CONTROL SUB-ASSEMBLY LH WAS DEFECTIVE)
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2013 - ]
REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH. Refer to REMOVAL [10/2013 - ]
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2013 - ]