Replacing the control module

Try a new light switch module (LSM) and combustion preheater module (CPM).

Only replace one control module at a time. Check the function of each control module between each replacement.

Remedy as necessary.

Other information 

• See Switches lights, replacing
• For cars manufactured up to w38 2001 inclusive, see Control module, engine coolant heater, replacing
• For cars manufactured from w39 2001 inclusive, see Control module engine coolant heater, replacing .

• Continue 

  Refer to Verification