Blower Motor Cooling Performance

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. 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 blower motor and verify it is cooling inlet air at the blower motor (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.

Using a diagnostic scan tool, monitor the following SCME Parameter Identifications (PIDs):
- Seat cushion thermal electric device temperature (CSHTEMP)
- Seat back thermal electric device temperature (BKTMP)
- Passenger Cushion Thermal Electric Device (TED) Temperature (PCSHTMP)
- Passenger Back (TED) Temperature (PBKTMP)
- Driver State Seat Mode (DCCSMOD)
- Passenger State Seat Mode (PCCSMOD)
- Driver Climate Control Seat State (DCCSTAT)
- Passenger Climate Control Seat State (PCCSTAT)
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 Chart: Front Seats or DTC Chart: SCME for diagnostic direction.
Gain access to the seat cushion and backrest blower motors and use a suitable thermocouple temperature measuring device to monitor the air inlet temperature.
- Place the temperature probe near each blower motor air filter.
NOTE: The engine must be running to operate the climate controlled seat system and carry out this test.

Operate system in high cool mode and measure the temperature at the cushion blower motor filter using the thermocouple device.
- Secure the temperature probe at the cushion blower motor and record the air inlet temperature.
Use a diagnostic scan tool to measure the cushion blower motor PID temperature and record the value.
- Monitor the STATE and MODE Parameter Identifications (PIDs) to verify the system is operating. If during testing, a PID value indicates a fault has occurred (putting the system into recovery mode) the seat has failed the test. Do not continue. Return to the diagnostic routine.
Subtract the cushion blower motor PID temperature from the cushion air inlet temperature and record the temperature difference value.
Continue to operate the system in high cool mode and use the thermocouple device to measure the temperature at the backrest blower motor inlet.
- Secure the temperature probe at the backrest blower motor inlet. Measure and record the air inlet temperature.
Use a diagnostic scan tool to measure the backrest blower motor PID temperature and record the value.
- Monitor the STATE and MODE Parameter Identifications (PIDs) to verify the system is operating. If during testing, a PID value indicates a fault has occurred (putting the system into recovery mode) the seat has failed the test. Do not continue. Return to the diagnostic routine.
Subtract the backrest blower motor PID temperature from the backrest air inlet temperature and record the value.
Compare the cushion and backrest calculated temperature values. The temperature difference should be between 6-8 ° C (10-14 ° F).
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 SCME self-test and if any Diagnostic Trouble Codes (DTCs) are retrieved, go to DTC Chart: SCME for diagnostic direction. Return to the diagnostic routine.