DTC B14F2: Seat Heater Temperature Sensor Malfunction: Procedure

1. Check for DTCs. Refer to DTC CHECK/CLEAR .
   RESULT
   
   

   Result	Proceed to
   DTC is output (Rear seat climate control ECU LH)	A
   DTC is output (Rear seat climate control ECU RH)	B

B → See step   6 

A: Go to next step 

1. Check the Data List for proper functioning of the temperature sensor.
   REAR LEFT SEAT A/C
   
   

   Item	Measurement Item/Range	Normal Condition	Diagnostic Note
   Seat Heat Temp	Seat heater temperature sensor signal/MIN: 0°C (32°F), MAX: 85°C (185°F)	Within range from 0 to 85°C (32 to 185°F)	-

   OK

   The display is as specified in the normal condition.

NG → See step   3 

OK → See step   10 

Fig 1: Identifying Rear Seat Cushion Cover LH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the cushion cover LH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 (H5) - 3 (HS)	Outside air temperature 20 to 40°C (68 to 104°F)	10.5 to 4 kΩ

NG → See step   12 

OK: Go to next step 

1. Disconnect the cushion cover connector.
   Fig 2: Identifying Rear Seatback Cover Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the f15 seatback cover connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A-2 (H5) - B-1 (H5)	Always	Below 1 Ω
   A-4 (HS) - B-3 (HS)	Always	Below 1 Ω
   A-2 (H5) - Body ground	Always	10 kΩ or higher
   A-4 (HS) - Body ground	Always	10 kΩ or higher

NG → See step   14 

OK: Go to next step 

Fig 3: Identifying Harness And Connector (Seat Climate Control ECU LH - Rear Seatback Cover LH And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the f14 ECU connector.
2. Disconnect the f15 seatback cover connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   f14-9 (H5) - f15-2 (H5)	Always	Below 1 Ω
   f14-10 (HS) - f15-4 (HS)	Always	Below 1 Ω
   f14-9 (H5) - Body ground	Always	10 kΩ or higher
   f14-10 (HS) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Check the Data List for proper functioning of the temperature sensor.
   REAR RIGHT SEAT A/C
   
   

   Item	Measurement Item/Range	Normal Condition	Diagnostic Note
   Seat Heat Temp	Seat heater temperature sensor signal/MIN: 0°C (32°F), MAX: 85°C (185°F)	Within range from 0 to 85°C (32 to 185°F)	-

   OK

   The display is as specified in the normal condition.

NG → See step   7 

OK → See step   13 

Fig 4: Identifying Rear Seat Cushion Cover RH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the cushion cover connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 (H5) - 3 (HS)	Outside air temperature 20 to 40°C (68 to 104°F)	10.5 to 4 kΩ

NG → See step   11 

OK: Go to next step 

1. Disconnect the cushion cover connector.
   Fig 5: Identifying Rear Seatback Cover Connector Terminals RH

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the f3 seatback cover connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A-2 (H5) - B-1 (H5)	Always	Below 1 Ω
   A-4 (HS) - B-3 (HS)	Always	Below 1 Ω
   A-2 (H5) - Body ground	Always	10 kΩ or higher
   A-4 (HS) - Body ground	Always	10 kΩ or higher

NG → See step   15 

OK: Go to next step 

Fig 6: Identifying Harness And Connector (Seat Climate Control ECU RH - Rear Seatback Cover RH And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the f7 ECU connector.
2. Disconnect the f3 seatback cover connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   f7-9 (H5) - f3-2 (H5)	Always	Below 1 Ω
   f7-10 (HS) - f3-4 (HS)	Always	Below 1 Ω
   f7-9 (H5) - Body ground	Always	10 kΩ or higher
   f7-10 (HS) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13