| 1 |
Thermistor open |
Measure the resistance between seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 3 and No. 2 [No. 4].
If the resistance value is at least 350 kΩ. The thermistor is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
). |
Check for continuity between seat ventilation control unit 37P connector terminals No. 9 [No. 36] and No. 21 [No. 20] and seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 3 and No. 2 [No. 4] respectively.
If there no continuity, repair an open in the wire. |
| 2 |
Thermistor short |
Measure the resistance between seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 2 [No. 4] and No. 3.
If the resistance value is 600 Ω or less. The thermistor is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
). |
Disconnect the seat ventilation control unit 37P connector, and check for continuity between body ground and seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 2 [No. 4] and No. 3 individually.
If there continuity, repair a short to ground in the wire. |
| 3 |
Heater current abnormal |
Go to the ventilated seat system input test, and do all power and ground input tests (see
). If the tests prove OK, measure the resistance between seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 1 [No. 5] and No. 4 [No. 2], and seat-back heater connector B (2P) terminals No. 1 and No. 2:
- If the resistance value of the seat cushion heater is out of the range between 4.7 and 5.7 Ω. The seat cushion heater is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
).
- If the resistance value of the seat-back heater is out of the range between 4.5 and 5.6 Ω. The seat-back heater is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
).
|
| Heater voltage abnormal |
Go to the ventilated seat system input test, and do all power and ground input tests (see Control Unit Input Test/Replacement ). |
| 4 |
Seat ventilation switch failure |
Go to the ventilated seat system input test, and do all power and ground input tests (see Control Unit Input Test/Replacement ). If the tests prove OK, measure the resistance between seat cushion heater connector A (5P) [seat cushion heater 5P connector] terminals No. 1 [No. 5] and No. 4 [No. 2], and seat-back heater connector B (2P) terminals No. 1 and No. 2:
- If the resistance value of the seat cushion heater is out of the range between 4.7 and 5.7 Ω. The seat cushion heater is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
).
- If the resistance value of the seat-back heater is out of the range between 4.5 and 5.6 Ω. The seat-back heater is faulty; replace the seat cushion cover/pad (see
FRONT SEAT CUSHION COVER REPLACEMENT
).
- If the resistance value is within the specified value, replace the seat ventilation control unit.
|
| 5 |
Seat not heating |
| []: Front passenger's seat |