Checking Seat Heating Module (SHM)

Checking Seat heating module (SHM)

Checking the seat heating
The system for seat heating consists of three different parts:
- The task of the Seat heating module (SHM) is to check the function and to communicate with the Climate control module (CCM).
- Two heating elements.
- A temperature sensor.
On certain markets, it is not permitted to have seat heating in the vehicle. Check to see if the vehicle has seat heating by clicking the VCT2000 symbol.









Does the vehicle have seat heating?

Yes - Checking communication faults

No - Exit fault-tracing

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Checking communication faults
If the seat heating does not work, this may be because the Seat heating module (SHM) is damaged, that there is no communication with the Seat heating module (SHM) or that the temperature sensor is damaged.
Check communication by clicking on the VCT2000 symbol and reading off the status for seat heating.





Could the status be read out?

Yes - Checking the control module

No - Checking communication

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Checking the control module
Start by replacing the left Seat heating module (SHM) with the right Seat heating module (SHM) and checking that the affected side now works. If both Seat heating modules (SHM) are damaged, replace one with a new one and check the function of each.
Replace damaged control module.

Other information:
- Seat heating module (SHM), replacing Service and Repair





Is the function OK?

Yes - FAULT FOUND

No - Checking heater elements

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Checking heater elements
Continue fault tracing by replacing the temperature sensor and the two heating elements in the damaged seat. Activate the seat heating. Check that the seat heats up.

Also check the function of the Seat heating module (SHM) which was installed from the start. If seat heating works, keep the original control module.

Other information:
- Seat heating module (SHM), replacing Service and Repair
- Seat heating module (SHM), replacing Service and Repair

Do you want to exit fault-tracing?

Yes - FAULT FOUND

No - Checking the seat heating

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Checking communication
The fault is probably communication related.
Continue checking the LIN bus to the climate control module (CCM) to fault trace the communication.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Checking the control module

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