Checking Components
- Ignition off
- Disconnect connector A for the seat heating module (SHM) left
- Ignition on.
The climate control module (CCM) has detected that a component on LIN bus 1 is transmitting incorrect data and disrupting communication on the LIN bus.
Check the communication by disconnecting the seat heating module (SHM) left.
If other control modules on LIN bus 1 now function, replace the seat heating module (SHM) left.
Was a fault detected?
- YES
Refer to VERIFICATION
- NO
Refer to CHECKING COMPONENTS
- Ignition off
- Reconnect connector A for the seat heating module (SHM)
- Ignition on.
Check the components on the climate control unit as follows:
- Disconnect the connectors for the components one at a time
- Check whether the other components regain functionality, for example by activating seat heating
- If the functionality for the other components returns, the fault is probably in the disconnected components.
Remedy as necessary.
Other information:
- For further information about the connectors, fuses and relays, see the relevant service information.
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL DESCRIPTION
- see COMPONENT LOCATION
- see CLIMATE UNITS
- see CLIMATE CONTROL MODULE (CCM)
- see SEAT HEATING MODULE (SHM)
- see CHECKING WIRING AND TERMINALS