Climate Seats Diagnostics - System Overview
Each seat has two climate assemblies: one in the seat base and one in the seat backrest. Each climate assembly is comprised of a fan, a TED (Thermal Electric Device) and some ducting connecting the two. The fan draws in passenger compartment air and blows it through the ducting and across the two halves of the TED. Therefore, half of the air coming from the fan is directed across the main side of the TED and into the seat foam, while the other half is directed across the waste side of the TED and exhausted. Depending on the direction current is applied across the TED, one side will get hot while the other will get cold or vice versa when the current is reversed. For example, if the customer selects seat cooling, the main side of the TED will get cold directing cool air into the seat, while the waste side of the TED will become hot directing warm waste air away from the seat.
Climate Assembly Description
The image in the box shows the reverse side of the TED
| KEY | DESCRIPTION |
|---|---|
| 1. |
|
| 2. |
|
| 3. |
|
| 4. |
|
| 5. |
|
TED Functionality
The image below show the difference between the selected function, cooling/heating
| KEY | A. OCCUPANT SELECTS COOLING FUNCTION | B. OCCUPANT SELECTS HEATING FUNCTION |
|---|---|---|
| 1. | Passenger compartment air | Passenger compartment air |
| 2. | Ducting | Ducting |
| 3. | Hot side of TED (the location changes depending on the selected function, cooling/heating) | Hot side of TED (the location changes depending on the selected function, cooling/heating) |
| 4. | TED | TED |
| 5. | Cold side of TED (the location changes depending on the selected function, cooling/heating) | Cold side of TED (the location changes depending on the selected function, cooling/heating) |
| 6. | Current | Current |
| 7. | Cold air to occupant (the location changes depending on the selected function, cooling/heating) | Cold exhaust air (the location changes depending on the selected function, cooling/heating) |
| 8. | Outlet to bellows | Outlet to bellows |
| 9. | Hot exhaust air (the location changes depending on the selected function, cooling/heating) | Hot air to Occupant (the location changes depending on the selected function, cooling/heating) |
| 10. | Exhaust | Exhaust |
The seat base and seat backrest climate assemblies are wired in series and are connected to the HVAC through a seat climate control module. The seat climate control module monitors the fan speeds and temperatures of the TED's. Any faults detected in the seat base and/or seat backrest climate assemblies should trigger a DTC to be set by the HVAC . The service information lists the potential symptoms that may be exhibited by the seat climate system and the steps that should be taken to rectify the faults.