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Component Testing - Thermo-Electric Device (TED) Cooling Performance

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: This test is intended to check the cooling mode performance of an operational climate controlled seat backrest or cushion Thermo-Electric Device (TED) and verify it is cooling inlet air at the TED (ambient cabin air) between 6-8°C (10-14°F).
NOTE: Make sure the vehicle is out of direct sunlight and is in an area with a stable air temperature when testing the climate controlled seat system.
NOTE: For correct temperature measurements, the seat being tested should be occupied.
  1. Enter DataLogger and monitor the following Dual Climate Controlled Seat Module (DCSM) PIDs:
    • CSHTEMP (Seat cushion thermal electric device temperature)
    • BK_TEMP (Seat back thermal electric device temperature)
    • PCSHTMP (Passenger Cushion Thermal Electric Device [TED] Temperature)
    • PBKTMP (Passenger Back TED Temperature)
    • DCCSMOD (Driver State Seat Mode)
    • PCCSMOD (Passenger State Seat Mode)
  2. Any initial PID value of greater than 205°C (401°F) or less than 2°C (36°F) indicates a system hardware failure. Do not proceed with this test. GO to SYMPTOM TABLE  or DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) DTC TABLE  for diagnosis.
  3. Gain access to the seat backrest and cushion TEDs  and use a suitable thermo-couple temperature measuring device to monitor the air inlet temperature.
    • Access the backrest TED  .
      • Release the backrest trim cover J-clips at the sides and bottom.
      • Pull out at the bottom and detach the 2 lower hard back panel pin-type retainers.
      • Position the backrest trim cover aside.
    • Place the temperature probe near each TEDs  air filter.
    NOTE: Typical backrest and cushion TED shown, others similar.
    Fig 1: Locating Temperature Probe
    G06259446Courtesy of FORD MOTOR CO.
  4. Operate system in high cool mode and measure the temperature at the cushion TED filter using the thermo-couple device.
    • Obtain and record the air inlet temperature at the TED  .
    NOTE: The engine must be running to operate the climate controlled seat system and carry out this test.
  5. Use a scan tool to measure the cushion TED PID temperature and record the value.
    • Monitor the MODE PID and verify the system is operating. If during testing the PID value changes to Blower Only state, the system has entered into recovery mode and voltage to the TEDs  is disabled. If this occurs, the seat has failed the test. Do not continue. Return to the diagnostic routine.
  6. Subtract the cushion TED PID temperature from the cushion air inlet temperature and record the temperature difference value.
  7. Continue to operate the system in high cool mode and use the thermo-couple device to measure the temperature at the backrest TED filter.
    • Obtain and record the air inlet temperature at the TED  .
    • Secure the temperature probe at the backrest TED air filter and close the backrest trim cover before measuring.
  8. Use a scan tool to measure the backrest TED PID temperature and record the value.
    • Monitor the MODE PID and verify the system is operating. If during testing the PID value changes to Blower Only state, the system has entered into recovery mode and voltage to the TEDs  is disabled. If this occurs, the seat has failed the test. Do not continue. Return to the diagnostic routine.
  9. Subtract the backrest TED PID temperature from the backrest air inlet temperature and record the value.
  10. Compare the cushion and backrest calculated temperature values. Both values should be between 6°-8°C (10.8°-14.4°F) and approximately equal (±1°C [±1.8°F]).
  11. If the calculated temperature values are not within these specifications, check the climate controlled seat components for air duct or filter restrictions, blockages, duct or electrical disconnections and for incorrect assembly. Repair as needed. If OK, carry out the DCSM  self-test and if any DTC is retrieved, go to DUAL CLIMATE CONTROLLED SEAT MODULE (DCSM) DTC TABLE  for diagnostic direction. Return to the diagnostic routine.
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